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Study on creep deformation and energy development of underground surrounding rock under four-dimensional support
Zhanguo Ma, Junyu Sun, Peng Gong, Pengfei Yan, Nan Cui, Ruichong Zhang
发布时间:2024-03-07
关键词:coal mines, elastic strain energy, four‐dimensional support, large roadway depth, long‐term stabilitycontrol, plastic deformation, surrounding roc
摘要:The numerical simulation results indicate that the combined support mode of 4D roof supports and conventional side supports is highly applicable to the stability control of surrounding rock with a roadway depth exceeding 520 m. With the increase of roadway depth, 4D support can effectively restrain the area and depth of plastic deformation in the surrounding rock. Further, 4D support limits the accumulation range and rate of elastic strain energy as the creep deformation time increases. 4D support can effectively reduce the plastic deformation of roadway surrounding rock and maintain the stability for a long deformation period of 6 months. As confirmed by in situ monitoring results, 4D support is more effective for the long-term stability control of surrounding rock than conventional
阅读全文 PDF 引用A preliminary site selection system for underground hydrogen storage in salt caverns and its application in Pingdingshan, China
Liangchao Huang, Yanli Fang, Zhengmeng Hou, Yachen Xie, Lin Wu, Jiashun Luo, Qichen Wang, Yilin Guo,
发布时间:2024-02-28
关键词:analytic hierarchy process (AHP), evaluation index, hydrogen storage, salt cavern, site selectio
摘要:Based on a detailed classification and analysis, a “four-factor” model for the site selection of salt cavern hydrogen storage is proposed, encompassing the dynamic demands of hydrogen energy, geological, hydrological, and ground factors of salt mines. Subsequently, 20 basic indicators for comprehensive suitability grading of the target site were screened using the analytic hierarchy process and expert survey methods were adopted, which provided a preliminary site selection system for salt cavern hydrogen storage. Ultimately, the developed system was applied for the evaluation of salt cavern hydrogen storage sites in the salt mines of Pingdingshan City, Henan Province, thereby confirming its rationality and effectiveness. This research provides a feasible method and theoretical basis for the site selection of UHS in salt caverns in China.
阅读全文 PDF 引用Mechanical properties and fracture surface roughness of thermally damaged granite under dynamic splitting
Yijin Qian, Peng Jia, Songze Mao, Jialiang Lu
发布时间:2024-01-12
关键词:Mechanical properties and fracture surface roughness of thermally damaged granite under dynamic splitting
摘要:AbstractIn order to understand the mechanical properties and the fracture surface roughness characteristics of thermally damaged granite under dynamic splitting, dynamic Brazilian splitting tests were conducted on granite samples after thermal treatment at 25, 200, 400, and 600°C. Results show that the dynamic peak splitting strength of thermally damaged granite samples increases with increasin...
阅读全文 PDF 引用Spatiotemporal mapping of (ultra-)mafic magmatic mine areas: Implications of economic and political realities in China
Heling Li, Liang Tang, Tim T. Werner, Zhengmeng Hou, Fan Meng, Jingjing Li
发布时间:2024-01-12
关键词:Spatiotemporal mapping of ultramafic magmatic mine areas Implications economic and political realities in China
摘要:AbstractThe spatiotemporal extension/expansion of mine areas is affected by multiple factors. So far, very little has been done to examine the interaction between mine areas and political or economic realities. The (ultra-)mafic magmatic mines in China played a specific role in supporting national development and providing an ideal research subject for monitoring their interrelationship. In thi...
阅读全文 PDF 引用Development and applications of the quasi-dynamic triaxial apparatus for deep rocks
Jinzhi Luo, Yanyan Cai, Jin Yu, Jianzhi Zhang, Yaoliang Zhu, Yao Wei
发布时间:2024-01-12
关键词:Development and applications of the quasidynamic triaxial apparatus for deep rocks
摘要:AbstractThe mechanical behaviors of deep rocks have always posed a challenge for the implementation and safe operation of major underground engineering projects. To this end, this study modified the existing mainstream rock mechanics instruments equipped with a dynamic disturbance loading system and developed a second-generation TFD-2000/D triaxial instrument. The first-generation device is equ...
阅读全文 PDF 引用Dynamically triggered seismicity on a tectonic scale: A review
Chengzhi Qi, Mingyang Wang, Gevorg Kocharyan, Artem Kunitskikh, Zefan Wang
发布时间:2024-01-12
关键词:Dynamically triggered seismicity on a tectonic scale A review
摘要:AbstractEarthquakes triggered by dynamic disturbances have been confirmed by numerous observations and experiments. In the past several decades, earthquake triggering has attracted increasing attention of scholars in relation to exploring the mechanism of earthquake triggering, earthquake prediction, and the desire to use the mechanism of earthquake triggering to reduce, prevent, or trigger ear...
阅读全文 PDF 引用Development and application of novel high-efficiency composite ultrafine cement grouts for roadway in fractured surrounding rocks
Maolin Tian, Shaojie Chen, Lijun Han, Hongtian Xiao
发布时间:2023-11-08
关键词:Development and application of novel highefficiency composite ultrafine cement grouts for roadway in fractured surrounding rocks
摘要:1 INTRODUCTIONWith the increase of coal mining depth, both the stress and fracture condition of the surrounding rock increase. The deformation and the failure mechanism of roadway also become more complex under deep complex geo-stress. The high crustal stress and strong mine pressure can easily lead to the fracture of the roadway's surrounding rock (He, 2011; Li, Wang, et al., 2021; Li, Zhang, ...
阅读全文 PDF 引用Exploring the combination of biochar-amended soil and automated irrigation technology for water regulation and preservation in green infrastructure
朱鸿鹄, Yuanxu Huang, Haihong Song, Jian Chen, Songlei Han, Tanwee Mazumder, Ankit Garg
发布时间:2023-11-23
关键词:Exploring the combination of biocharamended soil and automated irrigation technology for water regulation preservation in green infrastructure
摘要:1 INTRODUCTIONSoil water retention and permeability are essential properties for analyzing seepage and hence the stability of geotechnical engineering infrastructure. Various studies have promoted the use of biochar to enhance these properties. However, there is also a need to enhance the regulation of the water content in green infrastructure covers (i.e., landfill covers, slopes, etc.), which...
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Research on damage failure mechanism and dynamic mechanical behavior of layered shale with different angles under confining pressure
含特征层理页岩围压下的秘密:损伤机理与动态力学行为解密
Ning Luo, Haohao Zhang, Yabo Chai, Penglong Li, Cheng Zhai, Jianan
发布时间:2024-01-29
关键词:Research on damage failure mechanism and dynamic mechanical behavior of layered shale with different angles under confining pressure
摘要:岩石工程的深入发展使得高地应力下岩石的动态力学性质及破坏特性成为研究的焦点。在高低应力下的变形稳定性和关键控制因素的识别是岩石力学和工程未来研究中的难题。高地应力、温度、渗透压和采矿干扰的复杂环境导致了围压不稳定性和岩爆的不可避免性。本研究建立了围压作用下考虑层理效应的页岩有限元模型。研究结果可作为深部资源开采的关键技术参数。
阅读全文 PDF 引用The role of temperature-enhanced fault closure in promoting postinjection pressure diffusion and seismicity in enhanced geothermal systems
Yinlin Ji, Yuedu Chen, Hannes Hofmann, Yuan Zhang, Arno Zang, Günter Zimmermann
发布时间:2023-11-23
关键词:The role of temperatureenhanced fault closure in promoting postinjection pressure diffusion and seismicity enhanced geothermal systems
摘要:AbstractPost shut-in seismic events in enhanced geothermal systems (EGSs) occur predominantly at the outer rim of the co-injection seismic cloud. The concept of postinjection fracture and fault closure near the injection well has been proposed and validated as a mechanism for enhancing post shut-in pressure diffusion that promotes seismic hazard. This phenomenon is primarily attributed to the p...
阅读全文 PDF 引用Fan-hinged shear instead of frictional stick–slip as the main and most dangerous mechanism of natural, induced, and volcanic earthquakes in the earth's crust
俄罗斯资深教授发表系列文章-2:风扇机制 - 地震理解的范式转变
Boris G. Tarasov
发布时间:2023-11-07
关键词:Fanhinged shear instead of frictional stickslip as the main and most dangerous mechanism natural induced volcanic earthquakes in earths crust
摘要:1 INTRODUCTIONFrictional stick–slip instability along pre-existing faults has been accepted as the main mechanism of earthquakes for about 60 years, following the publication of laboratory results by Brace and Byerlee (1966). The gist of their work is the conclusion that the stick–slip instability along pre-existing faults in rock specimens reflects all the features inherent in earthquakes, s...
阅读全文 PDF 引用Dominant factors in MiniCone, CPT and pile correlations: A data-based approach
揭秘MiniCone、CPT和桩之间的关键联系:基于数据的深度探索
Seyed Sajad Shirani, Abolfazl Eslami, Amirhossein Ebrahimipour, Moses Karakouzian
发布时间:2023-11-23
关键词:Dominant factors in MiniCone CPT and pile correlations A databased approach
摘要:1 INTRODUCTIONDevices and equipment can be transported to the site for performing in situ tests, aiming to overcome the challenges associated with conventional methods comprising drilling, sampling, transportation, remolding, and testing (Schmertmann, 1978). Research has been conducted to provide the possibility of modeling real conditions in practice from different aspects representing realist...
阅读全文 PDF 引用New understandings on initiation and evolution of disasters in deep underground
Jianguo Wang, Heping Xie, Chunfai Leung, Xiaozhao Li
发布时间:2023-10-24
关键词:New understandings on initiation and evolution of disasters in deep underground
摘要:The editors wish to highlight the articles appearing in this issue. The first article, entitled “New physics of supersonic ruptures” by Boris G. Tarasov, concerns the development of a new theory on the potential occurrence of ruptures after deep underground earthquakes. Two other articles belong to our first special theme of “Disaster evolution in deep underground.” The final two articles i...
阅读全文 PDF 引用New physics of supersonic ruptures
Boris G. Tarasov
发布时间:2023-10-12
关键词:New physics of supersonic ruptures
摘要:AbstractUntil recently, it is believed that the rupture speed above the pressure wave is impossible since spontaneously propagating ruptures are driven by the energy released due to the rupture motion, which is transferred through the medium to the rupture tip region at the maximum speed equal to the pressure wave speed. However, the apparent violation of classic theories has been revealed by n...
阅读全文 PDF 引用Coupling effects of temperature, confining pressure, and pore pressure on permeability and average pore size of Longmaxi shale
Xiaoyan Zhang, Hongsen Li, Xue Tan, Guoliang Li, Hua Jiang
发布时间:2023-08-17
关键词:absolute permeability, apparent permeability, gas slippage factors, pore width, shale
摘要:AbstractThe evolution due to temperature and pressure of shale reservoir permeability affects the productivity evaluation and development decision of shale gas reservoirs, which is very important for the exploration and development of unconventional gas reservoirs. This study analyzed the coupling effects of temperature (25, 50, and 75°C), effective stress (15 and 30 MPa), and pore pressure (0...
阅读全文 PDF 引用Shaking table test and cumulative deformation evaluation analysis of a tunnel across the hauling sliding surface
山区隧道工程:滑坡隐患的解决之道
Lifang Pai, Honggang Wu, Xu Wang
发布时间:2023-11-18
关键词:Shaking table test and cumulative deformation evaluation analysis of a tunnel across the hauling sliding surface
摘要:滑坡是山区隧道施工中最复杂的灾害之一。由于山区地形等条件的限制,隧道必须靠近或直接穿过易滑坡区,或者隧道穿过的边坡区以前经历过滑坡。在地震和隧道施工的干扰下,先前稳定或变形不明显的边坡会发生较大的变形,甚至发展成滑坡。隧道-滑坡相互作用问题日益突出,已成为地下工程研究的热点问题。本文从大量具有共同关系的工程案例中概化模型,并进行振动台试验,以获得研究的通用规则,这也使试验结果更具可扩展性。研究成果可为西部山区高烈度地震区交通隧道工程的建设提供重要的理论技术支撑。
阅读全文 PDF 引用Excavation compensation theory and supplementary technology system for large deformation disasters
大变形灾害开挖补偿理论及其配套技术体系
Manchao He, Qiru Sui, Zhigang Tao
发布时间:2023-06-27
关键词:nergy engineering, excavation compensation, large deformation, NPR anchor cable, slopeengineering, traffic tunnel engineering
摘要:鉴于能源工程、交通隧道工程、边坡工程中大变形灾害治理的挑战,提出了大变形灾害的开挖补偿理论,并研发了其配套技术体系。基于 "隧(巷)道工程中的破坏都源于工程开挖 "的理念,本文从 “道”、“器”、“术”,以及大变形力学设计方法和工程应用五个方面总结介绍了开挖补偿理论的发展。首先,发展了补偿力的计算方法,完善了大变形灾害控制理论体系。其次,介绍了自主研发的具有高恒阻力、大变形、超吸能特性的负泊松比(NPR)锚杆/索,及其大变形灾害控制应用效果;智能隧道监测预警云平台系统和滑坡地质灾害牛顿力远程监测预警系统。再者,介绍了针对不同工程背景提出的双梯度超前注浆技术、二维爆破技术、牛顿力监测-预警-控制一体化技术。最后,介绍了该理论在能源工程、交通隧道工程、边坡工程等领域成功应用的典型案例。开挖补偿理论在大变形灾害控制中的效果得到了成功验证。
阅读全文 PDF 引用Visualizing experimental investigation on gas–liquid replacements in a microcleat model using the reconstruction method
Shaojie Chen, Jicheng Zhang, Dawei Yin, Faxin Li, Jialin Lu, Peiyang Zhu
发布时间:2023-05-31
关键词:dynamic contact angle,flow visualization, instantaneous velocity, microcleat, residual liquid
摘要:Highlights Geometric characterization and reconstruction of a three-dimensional transparent cleat model were performed. Gas–liquid repulsion characteristics were determined in a visualized microcleat model. Transient flow velocity hysteresis is evident in tortuous channels. Dynamic variation of the contact angle shows diversity. Pressure changes the groove liquid content and liquid film thickness.
阅读全文 PDF 引用Nonlinear anisotropic finite element analysis of liquefiable tunnel–sand–pile interaction under seismic excitation
Md. Foisal Haque
发布时间:2023-11-23
关键词:Nonlinear anisotropic finite element analysis of liquefiable tunnelsandpile interaction under seismic excitation
摘要:AbstractNonlinear time-history analysis can be used to determine the liquefiable behaviors of the tunnel–sand–pile interaction (TSPI) model with the consideration of sand anisotropy. This study presents the nonlinear response of the TSPI model with the existence of liquefaction under seismic excitation. The analysis reveals that tunnel and pile behave as isotropic elements, while sand shows i...
阅读全文 PDF 引用A research on excavation compensation theory for large deformation disaster control and a review on the multiphysical–multiscale responses of salt rock for underground gas storage
Jianguo Wang, Heping Xie, Chunfai Leung, Xiaozhao Li
发布时间:2023-05-31
关键词:A research on excavation compensation theory for large deformation disaster control and a review the multiphysicalmultiscale responses of salt rock underground gas storage
摘要:We highlight two articles in this issue: A research article titled “Excavation compensation theory and supplementary technology system for large deformation disasters” by Manchao He et al. and a review article titled “Mineralogy, microstructures and geomechanics of rock salt for underground gas storage” by Veerle Vandeginste et al.
阅读全文 PDF 引用Safety analysis of Sormeh underground mine to improve sublevel stoping stability
Mostafa Hosseini, Amin Azhari, Rahman Lotfi, Alireza Baghbanan
发布时间:2023-05-31
关键词:Safety analysis of Sormeh underground mine to improve sublevel stoping stability
摘要:Highlights The Taguchi method has been applied to study the influence of geometric parameters and stress on stope stability. The results show a full factorial analysis is more reliable as stope stability is a complex process. The squat pillar and Mathews method overestimates the impact of overburdened stress and stope height on rib pillar stability. In a high stope that is divided with several sill pillars, the Mathews method cannot accurately predict the sill pillar's impact on stope stability. For roof stability, sill pillar and stope span should be considered the most influential parameters, whereas W/H ratios should be assessed for hanging wall stability.
阅读全文 PDF 引用Mineralogy, microstructures and geomechanics of rock salt for underground gas storage
Veerle Vandeginste, Yukun Ji, Frank Buysschaert, George Anoyatis
发布时间:2023-05-31
关键词:creep, hydrogen, impurities, rock salt, salt solution mining, underground gas storage
摘要:Highlights Hydrogen may become indispensable in the transition to renewable energy Rock salt caverns may provide leak-proof containers for hydrogen storage Mineralogical composition links with depositional environment and diagenesis Microstructure links to cataclastic deformation, diffussive mass transfer and intracrystalline plastic deformation Geomechanical behavior of rock salt is influenced by its composition and impurities
阅读全文 PDF 引用A multiphysical-geochemical coupling model for caprock sealing efficiency in CO2 geosequestration
中国、澳大利亚和新加坡共同探秘多物理地球化学耦合模型下的二氧化碳地质封存
王建国, 王惠民,王小林, 杨圣奇, Hongtao Wu, Chunfai Leung, Jiali Tian
发布时间:2023-05-31
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Prediction of rock mass classification in tunnel boring machine tunneling using the principal component analysis (PCA)–gated recurrent unit (GRU) neural network
Ke Man, Liwen Wu, Xiaoli Liu, Zhifei Song, Kena Li, Nawnit Kumar
发布时间:2024-04-12
关键词:Prediction of rock mass classification in tunnel boring machine tunneling using the principal component analysis PCAgated recurrent unit GRU neural network
摘要:AbstractDue to the complexity of underground engineering geology, the tunnel boring machine (TBM) usually shows poor adaptability to the surrounding rock mass, leading to machine jamming and geological hazards. For the TBM project of Lanzhou Water Source Construction, this study proposed a neural network called PCA–GRU, which combines principal component analysis (PCA) with gated recurrent uni...
阅读全文 PDF 引用Evolution law of pulsating seepage and thermal deformation by injecting high-temperature steam into coal for thermal coalbed methane recovery
Zhiqiang Li, Junliang Li, Jinsheng Chen, Ali Karrech, Ningchao Zhang, Ju Chang, Kaiqi Jin, Yangyang
发布时间:2024-04-12
关键词:Evolution law of pulsating seepage and thermal deformation by injecting hightemperature steam into coal for coalbed methane recovery
摘要:AbstractChinese coal reservoirs are characterized by low pressure and low permeability, which need to be enhanced so as to increase production. However, conventional methods for permeability enhancement can only increase the permeability in fractures, but not the ultra-low permeability in coal matrices. Attempts to enhance such impermeable structures lead to rapid attenuation of gas production,...
阅读全文 PDF 引用ALSTNet: Autoencoder fused long- and short-term time-series network for the prediction of tunnel structure
Bowen Du, Haohan Liang, Yuhang Wang, Junchen Ye, Xuyan Tan, Weizhong Chen
发布时间:2024-04-12
关键词:ALSTNet Autoencoder fused long and shortterm timeseries network for the prediction of tunnel structure
摘要:AbstractIt is crucial to predict future mechanical behaviors for the prevention of structural disasters. Especially for underground construction, the structural mechanical behaviors are affected by multiple internal and external factors due to the complex conditions. Given that the existing models fail to take into account all the factors and accurate prediction of the multiple time series simu...
阅读全文 PDF 引用Development status and research recommendations for thermal extraction technology in deep hot dry rock reservoirs
Diquan Li, Ning Li, Jing Jia, Hongguang Yu, Qinghu Fan, Lichang Wang, Ahmed Mohsen
发布时间:2024-03-19
关键词:enhanced geothermal system, hot dry rock reservoir, thermoelastic stress, thermo‐hydro‐mechanicalcoupling
摘要:this article delves into a detailed discussion on the influence of fracture spacing, fracture permeability, fracture length, fluid injection rate, and injected fluid temperature on the performance of the EGS. In light of the thermo-hydro-mechanical coupling challenges associated with high-temperature reservoirs, it is suggested that future research efforts should focus on investigating the impact of thermo-induced stresses on the stability of the artificial fracture network within the EGS during long-term (>30 years) circulation of hot and cold fluids.
阅读全文 PDF 引用Grouped machine learning methods for predicting rock mass parameters in a tunnel boring machine-driven tunnel based on fuzzy C-means clustering
Ruirui Wang, Yaodong Ni, Lingli Zhang, Boyang Gao
发布时间:2024-03-19
关键词:fuzzy C‐means clustering, machine learning, rock mass parameter, tunnel boring machine
摘要:HighlightsThe traditional rock mass parameter predicting method based on machine learning and tunnel boring machine driving data is improved by fuzzy C-means clustering.Using fuzzy C-means clustering, samples are divided into multiple clusters and multiple targeted submodels are trained. The prediction results weighted by the multiple submodels are more accurate than those obtained by the tradi...
阅读全文 PDF 引用Experimental study on the physical and mechanical properties of carbonatite rocks under high confining pressure after thermal treatment
高温后碳酸盐岩在高围压作用下的物理力学特性试验研究
杨文东, Bingqi Wang, Jun Yao, Pathegama G. Ranjith, Xiang Zhang
发布时间:2024-03-15
关键词:carbonatite, high confining pressure, high temperature, oil and gas reservoirs, ultra‐deep rocks
摘要:The results show that the critical confining pressure of the brittle–ductile transition increases with increasing temperature. Young's modulus is negatively correlated with the temperature and positively correlated with the confining pressure. As the confining pressure increases, the failure mode of the specimens gradually transforms from shear fracture failure into “V”-type failure and finally into bulging failure (multiple shear fractures). With increasing temperature, the failure angle tends to decrease. In addition, an improved version of the Mohr‒Coulomb strength criterion with a temperature-dependent power function was proposed to describe the failure strength of carbonatite rocks after exposure to high temperature and high confining pressure.
阅读全文 PDF 引用Development of an optimization model for a monitoring point in tunnel stress deduction using a machine learning algorithm
Xuyan Tan, Weizhong Chen, Luyu Wang, Wei Ye
发布时间:2024-03-07
关键词:Development of an optimization model for a monitoring point in tunnel stress deduction using machine learning algorithm
摘要:HighlightsScientific guidance for monitoring scheme optimization is provided.The stress distribution of the overall section is characterized using limited numbers of monitoring points.Interdisciplinary application of machine learning helps in solving practical engineering problems.1 INTRODUCTIONAssessments of stress patterns in tunnel engineering are invaluable, as they directly impact the safe...
阅读全文 PDF 引用Application of integrated geophysical techniques in geothermal exploration in Binhai County, Jiangsu Province
Juncheng Wang, Shiyin Gao, Jianguo Wang, Lin Li, Xiaoyan Gong, Jinbao Su
发布时间:2024-03-07
关键词:controlled source audio frequency magnetotelluric method (CSAMT), geothermal exploration,integrated geophysical technology, micromotion detection technology
摘要:geothermal geological model was established for the BinhaiCounty of Jiangsu Province in China and potential geothermal well locationswere identified. On this basis, a geothermal well was drilled nearly 3000 mdeep, with a daily water volume of over 2000 m3/day and a geothermal watertemperature of 51°C at the well head. It is found that predictions using the aboveintegrated geophysical exploration technology are in good agreement with thewell geological formation data. This integrated geophysical technology can beeffectively applied for geothermal exploration with high precision and reliability
阅读全文 PDF 引用Experimental study on the influence of content and fineness of fly ash on the mechanical properties of grouting slurries
Hua Jiang, Handong Zhang, Xiaoyan Zhang, Jinxun Zhang, Yusheng Jiang
发布时间:2024-02-28
关键词:Experimental study on the influence of content and fineness fly ash mechanical properties grouting slurries
摘要:Abstract Excavation gaps around the front shield can be generated during shield construction, resulting in significant ground settlement. Traditional synchronous grouting slurries are unsuitable for filling these gaps during tunneling under existing subway lines. To address this issue, experiments are conducted on mix characteristics and hardening properties of slurries with variations in fineness and contents of fly ash.
阅读全文 PDF 引用A meso-damage-based constitutive model for yellow sandstone under dry–wet cycles
Zhe Qin, Runchang Zhang, Weizheng Mao, Jihuan Han, Zhiwen Li, Sunhao Zhang
发布时间:2024-02-26
关键词:constitutive model, damage coupling, dry–wet cycles, particleflow code, rock mechanics
摘要:in this study, meso-damage of a yellow sandstone is investigated and a meso-damage-based constitutive model for dry–wet cycles is proposed. First, computed tomography scanning and uniaxial compression tests were conducted on yellow sandstones under different dry–wet cycles. Second, the evolution of rock mesostructures and the damage mechanism subjected to dry–wet cycles were simulated using the discrete element method with Particle Flow Code in 2 Dimensions (PFC2D) software. Third, a constitutive model was proposed based on the meso-statistical theory and damage mechanics. Finally, this constitutive model was verified with the experimental results to check its prediction capability. It is found that the radius and number of pore throats in the sandstone increase gradually with the number of dry–wet cycles, and the pore structure connectivity is also improved.
阅读全文 PDF 引用Numerical study on local scour characteristics around submarine pipelines in the Yellow River Delta silty sandy soil under waves and currents
Peng Yu, Ruigeng Hu, Jike Zhang, Qi Yang, Jieru Zhao, Lei Cao, Chenghao Zhu
发布时间:2024-02-20
关键词:local scour, numerical simulation, submarine pipelines, Yellow River Delta
摘要:The results indicate that (1) local scour around submarine pipelines can be divided into three stages: rapid scour, slow scour, and stable scour. The maximum scour depth occurs directly below the pipeline, and the shape of the scour pits is asymmetric. (2) As the water depth decreases and the pipeline suspension height increases, the scour becomes more intense. (3) When currents go through a pipeline, a clear stagnation point is formed in front of the pipeline, and the flow velocity is positively correlated with the depth of scour. This study can provide a valuable reference for the protection of submarine pipelines in this area.
阅读全文 PDF 引用Effects of elevated ground temperatures on properties of cement grouts for deep rock grouting
Zhipeng Xu, Jianping Sun, Runguo Li, Lei He, Changwu Liu
发布时间:2024-02-05
关键词:Effects of elevated ground temperatures on properties cement grouts for deep rock grouting
摘要:This paper aims to experimentally gain insights into the effects of elevated ground temperatures on the properties of cement grout in fresh and hardened states in deep rock grouting. The results revealed that a temperature of 35°C is crucial for changes in the properties of thick cement grout with a water–cement ratio of less than 0.8. When the temperature is up to 35°C, there can be significant improvements in rheological parameters, acceleration of grout setting, and increase in the rheological time dependence of thick cement grout; however, there may also be a slight impact on the initial grout flowability and the nature of shear thinning.
阅读全文 PDF 引用Offshore high-grade limemud resources of west coast of India: Economic potential and industrial applications
Anil Kumar Adukadukkam, Rachna Pillai, Mamatha Puthiyathara Kanakamma
发布时间:2024-01-10
关键词:beneficiation, industrial grade, offshore limemud, west coast of India
摘要:Chemical, physical, mineralogical, beneficiation, and agglomeration studies found the offshore limemud as a potential replacement for limestone in the cement, filler, blast furnace, steel melting shop, lime production, paint, and Grade-I steel industries. An assessment of mining and transportation costs indicates that the offshore limemud (USD 5–6/ton) is more cost-effective than that imported from other countries (USD16-18/ton). With several advantageous factors like low impurity, mode of occurrence in overburden-free stratified form, fine-grained slurry nature, and shallow water depth, sustainable mining of offshore limemud could be a future reality with controllable technological, economic, and environmental challenges.
阅读全文 PDF 引用Impact of well placement and flow rate on production efficiency and stress field in the fractured geothermal reservoirs
Xinghui Wu, Meifeng Cai, Xu Wu, Ketong Zhang, Ziqing Yin, Yu Zhu
发布时间:2023-12-28
关键词:geothermal exploitation performance, geothermal reservoir, massflow rate, stressfield, well placement
摘要:The results indicate that the longer distance between wells can increase the outlet temperature of production wells and improve extraction efficiency in the short term. In contrast, the shorter distance between wells can reduce the heat exchange area and thus mitigate the impact on the reservoir stress. A larger mass flow rate is conducive to the production capacity enhancement of the geothermal system and, in turn causes a wider range of stress disturbance. These findings provide valuable insights into the optimization of geothermal energy extraction while considering reservoir safety and long-term sustainability. This study deepens the understanding of the THM coupling effects in geothermal systems and provides an efficient and environmentally friendly strategy for a geothermal energy system.
阅读全文 PDF 引用Physical and mechanical properties and microstructures of submarine soils in the Yellow Sea
田壮才, Yihua Chang, Sichao Chen, Gengchen Wang, Yanhong Hu, Chuan Guo, Lei Jia, Lei Song, J
发布时间:2023-11-23
关键词:Physical and mechanical properties microstructures of submarine soils in the Yellow Sea
摘要:AbstractIn recent years, the exploration of seabed has been intensified, but the submarine soils of silt and sand in the Yellow Sea area have not been well investigated so far. In this study, the physical and mechanical properties of silt and sand from the Yellow Sea were measured using a direct shear apparatus and their microstructures were observed using a scanning electron microscope. The te...
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