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

作　　者：Jian Yu Jiaming Liu Chun Fai Leung Maosong Huang Qi Wen Jorgin Tan 

机构地区：[1]Department of Geotechnical Engineering,Key Laboratory of Geotechnical and Underground Engineering of Ministry of Education,Tongji University,Shanghai 200092,China [2]Centre for Offshore Research and Engineering,Department of Civil and Environmental Engineering,National University of Singapore,119077,Singapore [3]Land Transport Authority,219428,Singapore

出　　处：《Underground Space》2024年第4期161-169,共9页地下空间（英文）

基　　金：financial support from the Natural Science Foundation of Shanghai(Grant No.23ZR1468500);the National Natural Science Foundation of China(Grant No.51738010);Singapore Housing and Development research grant on tunnel-foundation interaction(Research project number R-302-000-086-490).

摘　　要：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.

关 键 词：TUNNELLING RAFT CLAY Deflection ratio Centrifuge test 

分 类 号：O63[理学—高分子化学]