渗流条件下三维盾构隧道开挖面极限支护压力  

3D limit support pressure solution for shield tunnel face subjected to seepage

作　　者：吕玺琳[1,2] 李冯缔[1,2] 黄茂松[1,2] 焦齐柱[3] 胡雯婷[1,2] 

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]中铁第四勘察设计院集团有限公司,湖北武汉430063

出　　处：《岩土工程学报》2013年第S1期108-112,共5页Chinese Journal of Geotechnical Engineering

基　　金：国家杰出青年科学基金项目(50825803);国家自然科学基金青年科学基金项目(50908171);交通部科技项目(2009-353-333-340)

摘　　要：通过有限元数值模拟,对水位变化条件下盾构隧道开挖面的孔压分布特性进行了研究,并进一步分析了水位高度、隧道直径和隧道埋深对开挖面渗流力的影响,结果表明开挖面平均渗流力与水位高度近似呈线性关系。基于梯形楔形体模型,结合渗流数值模拟结果获得楔形体滑块边界上的平均渗流力,建立了考虑渗流影响的隧道开挖面总极限支护压力计算公式。与不考虑渗流影响的支护压力对比表明,总支护压力大部分用于平衡渗流力,且总支护压力随水位高度近似呈线性增长。将建立的模型用于钱江隧道工程,通过选取5个典型截面计算支护压力,获得了钱江隧道极限支护压力的变化规律。By adopting FE numerical simulation,the influence of water table line on the distribution of pore water pressure around the shield tunnel face is studied,and the influences of water table line,tunnel diameter,tunnel depth on the seepage force are obtained.The results show that the seepage force varies almost linearly with the water table line.By considering the average seepage force on the slide block,the face stability of shield tunnels is studied via trapezoidal wedge model,and a formula to calculate the limit support pressure under seepage condition is deduced.The seepage force shows great influence on the limit support pressure,and the total support pressure increases almost linearly with the water table line.The proposed model is used for the Qianjiang river shield tunnel project to calculate the limit support pressure of 5 selected typical sections,and the variation of support pressure is obtained.

关 键 词：盾构隧道 开挖面稳定 支护压力 楔形体模型 渗流 

分 类 号：U455.43[建筑科学—桥梁与隧道工程]