A thermal stress loading technique for large-sized hot dry rock mechanical tests
Huiling Ci, Bing Bai, Hongwu Lei, Yan Zou, Jianfeng Liu
发布时间：2024-04-26
关键词：Deep rock engineering, high‐temperature and high‐stress conditions, hot dry rock, large‐sized modeltest, thermal stress loading
摘要：AbstractTesting of large-sized specimens is becoming increasingly important in deep underground rock mechanics and engineering. In traditional mechanical loading, stresses on large-sized specimens are achieved by large host frames and hydraulic pumps, which could lead to great investment. Low-cost testing machines clearly always have great appeal. In this study, a new approach is proposed using...
阅读全文 PDF 引用Deformation monitoring at shield tunnel joints: Laboratory test and discrete element simulation
Maoyi Mao, Xiaowei Yang, Chun Liu, Tao Zhao, Hui Liu
发布时间：2024-04-26
关键词：Deformation monitoring at shield tunnel joints Laboratory test and discrete element simulation
摘要：AbstractShield tunnel, composed of several segments, is widely used in urban underground engineering. When the tunnel is under load, relative displacement occurs between adjacent segments. In the past, distributed optical fiber sensing technology was used to perform strain monitoring, but there is an urgent need to determine how to transform strain into displacement. In this study, optical freq...
阅读全文 PDF 引用Performance evaluation of rock fragmentation prediction based on RF-BOA, AdaBoost-BOA, GBoost-BOA, and ERT-BOA hybrid models
Junjie Zhao, Diyuan Li, Jian Zhou, Danial J. Armaghani, Aohui Zhou
发布时间：2024-04-22
关键词：ayesian optimization, blasting, machine learning, rock fragmentation
摘要：AbstractRock fragmentation is an important indicator for assessing the quality of blasting operations. However, accurate prediction of rock fragmentation after blasting is challenging due to the complicated blasting parameters and rock properties. For this reason, optimized by the Bayesian optimization algorithm (BOA), four hybrid machine learning models, including random forest, adaptive boost...
阅读全文 PDF 引用Assessment for shallow and large tunnel construction in weak ground conditions: Application of tunnel boring machines
Servet Karahan, Candan Gokceoglu
发布时间：2024-04-17
关键词：face pressure, NATM, railway tunnel, TBM, weak ground
摘要：AbstractWith recent technological advancements, tunnel boring machines (TBM) have developed and exhibited high performance in large diameters and weak ground conditions. Tunnels are crucial structures that significantly influence the timelines of highway and railway projects. Therefore, the construction of tunnels with TBMs becomes a preferred option. In this study, a comparative analysis betwe...
阅读全文 PDF 引用Bibliometric analysis of research challenges and trends in urban underground space
张友，郑亮，何灵玲，焦玉勇， 张友，郑亮，何灵玲，焦玉勇，彭汉发，Ranjith P. Gamage
发布时间：2024-04-16