局部水力交互下盾构隧道渗流与力学响应研究  

Seepage characteristics and mechanical response of shield tunnels under localized leakage and exosmosis

作　　者：谢家冲 黄昕[1,2] 金国龙 张子新[1,2] XIE Jia-chong;HUANG Xin;JIN Guo-long;ZHANG Zi-xin(Department of Geotechnical Engineering,Tongji University,Shanghai 200092,China;Key Laboratory of Geotechnical and Underground Engineering of the Ministry of Education,Tongji University,Shanghai 200092,China;China Shipbuilding Ninth Design and Research Institute Engineering Co.,Ltd.,Shanghai 200063,China)

机构地区：[1]同济大学地下建筑与工程系,上海200092 [2]同济大学岩土及地下工程教育部重点实验室,上海200092 [3]中船第九设计研究院工程有限公司,上海200063

出　　处：《岩土力学》2023年第4期1179-1189,共11页Rock and Soil Mechanics

基　　金：国家重点研发计划(No.2019YFC0605105);国家自然科学基金(No.41877227);上海市科技创新行动计划(No.21DZ1201103,No.19DZ1201004)。

摘　　要：针对有压盾构隧道中接缝水力劣化所引发的内外水力交互渗流问题,基于水力开度理论,通过数值和解析方法研究局部渗流下隧道衬砌与周围地层的渗流特性和力学响应。结果表明:基于镜像法推导的衬砌隧洞多点渗漏下渗流场解析解与数值解吻合良好,验证了给出的局部渗漏数值模型的有效性;局部外水内渗与内水外渗诱发的衬砌与地层共同作用存在较大差异,前者导致局部孔隙水压力降低引起土体挤压衬砌,衬砌轴力减小而弯矩增大从而产生衬砌外凸,后者则相反;多点局部渗漏对渗流场和衬砌响应的影响存在耦合作用,当内水压接近地层水头时可能出现外水内渗与内水外渗并存的特殊水力交互情况;地层渗透系数对局部渗漏行为的影响较大,复合地层下当局部渗漏发生于高渗透性地层时,其诱发的衬砌响应不显著,当渗漏处于下部低渗透性地层时,在地层交界面存在渗流折射现象,上部高渗透性地层起到补(排)水作用。In order to address the problem of groundwater infiltration and inner water exosmosis induced by the hydraulic deterioration of lining joints in pressurized shield tunnels,the seepage characteristics and mechanical responses of tunnel lining and surrounding stratum under localized leakage conditions are analyzed through both numerical and analytical method based on the hydraulic aperture theory.The results show that the analytical solutions derived from the classical image method for a multi-point leakage case match well with the numerical solutions,which verifies the effectiveness of the proposed numerical model of localized leakage.There is a significant difference in the characteristics of lining-stratum interaction induced by the localized groundwater infiltration and inner water exosmosis.The former leads to a reduction of the localized pore water pressure,resulting in a more compressive interaction between lining and stratum,a reduction in the lining axial force but an increase in the bending moment and further inducing an outward deformation at the leakage region.While the latter is the opposite.The influence of multi-point localized leakage on the seepage field and lining response has a coupling effect,and a special hydraulic interaction situation where the groundwater infiltration and inner water exosmosis may co-exist when the inner water pressure approaches the stratum hydraulic head.The localized leakage behavior is largely affected by the stratum permeability coefficient.Under composite stratum conditions,the induced lining response is not significant when the localized leakage occurs in a highly permeable stratum.The seepage flow refraction phenomenon exists at the stratum interface when the leakage is in the lower stratum with low permeability,while the upper stratum with high permeability acts as either a water supplement or drainage source.

关 键 词：有压隧洞 局部渗漏 内水外渗 接缝开度 衬砌响应 镜像法 

分 类 号：TU46[建筑科学—结构工程]