摘要
隧道工程中的地下水问题是富水地层中普遍存在的重要问题,地下水流动对隧道围岩稳定性有重要影响。本文利用解析法给出了饱和孔隙介质地层中考虑地下水渗流力作用下的应力,位移表达式;提出了隧道水力耦合数值分析中的耦合计算模型的建立方法并进行数值模拟分析。数值计算结果表明在考虑渗流影响条件下,隧道周边位移最大增加17.0%,最大剪应力最大增加10.3%。在不考虑衬砌条件下,由于渗流引起的渗流力增加了围岩的应力、位移,从围岩-支护结构共同作用原理考虑,进行隧道支护结构设计时是应该考虑渗流效应的。
The groundwater problem in tunnel engineering is a key issue which affects stability of tunnel. The stress and deformation formula of the tunnel ground involving the groundwater pressure in a saturated ground obtained by analytical methods are given. An analytical solution for a tunnel in the saturated ground considereding the hydromechanical coupling is obtained. Correlation methods to establish hydromechanical coupling mathematical models are proposed, and a practical example, in which the seepage effect is considered, is given to simulate tunnel excavation process; the variety of porous water pressure and the seepage effect on tunnel ground deformation is discussed. The results indicate tunnel ground displacement inerease 17.0% and maximum shear stress increase 10.3%. Without considering the liner, the seepage forces in the ground caused by the seepage increase stresses and deformations in tunnel ground. According to the principle of interaction between ground and support structure, the seepage effects should be considered in tunnel support structure design.
出处
《地下空间与工程学报》
CSCD
2005年第6期848-852,共5页
Chinese Journal of Underground Space and Engineering
基金
国家重大基础研究发展规划(973)项目(2002CB412707)资助项目
广东省岩土工程重点学科资助课题
关键词
隧道
水力耦合
数值模拟
tunnel
hydromechanical coupling
mathematical simulation
