Analytical solution of overlying pressure for shallowly buried underwater box tunnel:A case study of box jacking in Suzhou,China  

作　　者：Cheng Cheng Pengjiao Jia Pengpeng Ni Peixin Shi Qiao Xiang Yang Chen 

机构地区：[1]School of Rail Transportation,Soochow University,Suzhou,215131,China [2]Intelligent Urban Rail Engineering Research Center of Jiangsu Province,Soochow University,Suzhou,215131,China [3]School of Civil Engineering,Sun Yat-sen University,Zhuhai,519082,China [4]Southern Marine Science and Engineering Guangdong Laboratory,Zhuhai,519082,China [5]Guangdong Key Laboratory of Oceanic Civil Engineering,Zhuhai,519082,China [6]Guangdong Research Center for Underground Space Exploitation Technology,Zhuhai,519082,China [7]Shanghai Civil Engineering Co.,Ltd of CREC,Shanghai,201906,China [8]School of Civil and Architectural Engineering,Xi'an University of Technology,Xi'an,710048,China

出　　处：《Journal of Rock Mechanics and Geotechnical Engineering》2025年第4期2328-2343,共16页岩石力学与岩土工程学报(英文)

基　　金：supported by the Natural Science Foundation of Jiangsu Province of China (Grant Nos.BK20230500 and BK20210721);the Young Talent Fund of Association for Science and Technology in Shaanxi,China (Grant No.20240722).

摘　　要：Accurately predicting the overlying pressure is crucial for determining an appropriate cover depth of underwater box tunnels to avoid the uplifting failure.Based on the project of box jacking crossing the Beijing-Hangzhou Grand Canal in Suzhou,the characteristics of overlying pressure variation during tunneling are investigated.The monitoring results reveal that the fluctuation of overlying pressure is weakened during the rapid tunneling process.A modified analytical model for vertical earth pressure is conceived,in which the active and passive limit states for multi-layered soils are both considered.The probable range of overlying pressure obtained by the proposed model is suitable to cover the actual values.The anti-floating behavior of underwater box tunnels for two different working conditions is discussed by calculating the minimum cover depth.Using the calibrated analytical models,a parametric study is conducted to explore the influence of injection pressure,hardened slurry unit weight,soil internal friction angle,soil cohesion,and tunnel geometry.It is found that the injection pressure during the construction process is crucial for determining the necessary cover depth,and the change of box tunnel height makes it easier to trigger the variation of minimum cover depth.

关 键 词：Underwater box tunnel Overlying pressure Minimum cover depth Anti-floating behavior 

分 类 号：U45[建筑科学—桥梁与隧道工程]