Centrifuge study on behavior of raft foundation after tunnelling in soft clay

IF 8.2 1区 工程技术 Q1 ENGINEERING, CIVIL
Jian Yu , Jiaming Liu , Chun Fai Leung , Maosong Huang , Qi Wen Jorgin Tan
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Abstract

Ground losses due to tunneling would induce settlement of nearby raft foundations. To study the change in behavior of the raft foundations over time due to tunnel excavation in soft clay, a series of centrifuge model tests were conducted. The results reveal that the raft stiffness has a significant influence on the development of the gap between the raft and the ground. The width of the gap beneath the flexible foundation would increase over time, leading to a further increase in tensile strain after excavation, whereas the gap for raft foundations with a large stiffness would reduce with time, causing a gradual decrease in tensile strain. The modification factor (MF) design approach is also evaluated with the test results and demonstrates that the MF design approach would underestimate the tensile strain of the flexible raft and provide a relatively conservative prediction for larger stiffnesses.

软粘土隧道开挖后筏式地基行为的离心研究
隧道开挖造成的地面损失会引起附近筏基的沉降。为了研究在软粘土中开挖隧道导致筏基随时间变化的行为,我们进行了一系列离心模型试验。结果表明,筏基刚度对筏基与地面之间缝隙的发展有很大影响。柔性地基下的间隙宽度会随着时间的推移而增大,导致开挖后拉伸应变的进一步增加,而刚度较大的筏基的间隙会随着时间的推移而减小,导致拉伸应变逐渐减小。此外,还根据测试结果对修正系数(MF)设计方法进行了评估,结果表明修正系数设计方法会低估柔性筏基的拉伸应变,对较大刚度的预测相对保守。
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来源期刊
Underground Space
Underground Space ENGINEERING, CIVIL-
CiteScore
10.20
自引率
14.10%
发文量
71
审稿时长
63 days
期刊介绍: Underground Space is an open access international journal without article processing charges (APC) committed to serving as a scientific forum for researchers and practitioners in the field of underground engineering. The journal welcomes manuscripts that deal with original theories, methods, technologies, and important applications throughout the life-cycle of underground projects, including planning, design, operation and maintenance, disaster prevention, and demolition. The journal is particularly interested in manuscripts related to the latest development of smart underground engineering from the perspectives of resilience, resources saving, environmental friendliness, humanity, and artificial intelligence. The manuscripts are expected to have significant innovation and potential impact in the field of underground engineering, and should have clear association with or application in underground projects.
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