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