岩土工程学报2024，Vol.46Issue(4)：683-693,11.DOI:10.11779/CJGE20230008
波流耦合影响下分层海床隧道周围砂土渗流孔压及液化分析
Sand liquefaction and seepage pore pressure around shield tunnels in multilayered seabed under action of waves and currents
摘要
Abstract
At present,the existing theoretical studies on the seepage field around subsea shield tunnels under wave action generally consider the linings as an impermeable medium,and seldom consider the permeability of the tunnel linings,especially the influences of the coupling action of waves and currents on the tunnel.In addition,the existing theories generally regard the seabed as being homogeneous and isotropic,ignoring the influences of multilayered seabed.Firstly,based on the dynamic boundary conditions of seabed surface under wave-current interaction,the pore water pressure response of pure seabed under wave-current interaction is obtained by the transmission and reflection matrix method.Secondly,the mirror image method is introduced to establish the governing equation for the excess pore water pressure caused by the existence of tunnel,and the analytical solution of the equation is obtained by the Fourier series expansion under the continuous seepage between sand and linings.Then,based on the superposition principle,the seepage pressure of the sand around the tunnel in multilayered seabed under the action of waves and currents is obtained.Finally,the theoretical analytical solution is compared with the numerical results and the existing experimental results,and a good agreement is obtained.In addition,the influencing factors for the permeabilites of seabed and tunnel linings are analyzed.The results show that the following currents will increase the pore pressure in the seabed and the liquefaction degree of the seabed,while the opposing currents will reduce the pore pressure in the seabed and the liquefaction of the seabed.The relative difference of the seabed response to the opposing currents at the same velocity is generally greater than that of the following currents.When the permeability coefficient of the upper seabed is large(ks＞1×10-2 m/s),the overall pore pressure of the seabed is large,and the pore pressure at the first stratification changes significantly.When the permeability coefficient of tunnel linings is small(kl＜1×10-6 m/s),the tunnel has an obvious"block"effects on the propagation of the excess pore pressure in the seabed.关键词
海底盾构隧道/分层海床/波流耦合/渗流孔压/传递-反射矩阵法Key words
subsea shield tunnel/multilayered seabed/wave-current coupling/seepage pore pressure/transmission and reflection matrix method分类
建筑与水利引用本文复制引用
张治国,陈金芃,朱正国,PAN Y T,孙苗苗..波流耦合影响下分层海床隧道周围砂土渗流孔压及液化分析[J].岩土工程学报,2024,46(4):683-693,11.基金项目
国家自然科学基金项目(42177145,41977247) （42177145,41977247）
省部共建交通工程结构力学行为与系统安全国家重点实验室课题项目(KF2022-07) （KF2022-07）
山东省海洋生态环境与防灾减灾重点实验室课题项目(201703) （201703）
城市基础设施智能化浙江省工程研究中心课题项目(IUI2022-YB-01) （IUI2022-YB-01）
