抽取地下水引起承压含水层变形的研究

Study on Deformation of Aquifers Caused by Groundwater Pumping

上海地铁隧道纵向变形的影响因素众多,城市地面沉降是其主要因素之一,而抽取深层地下水是引起上海市地面沉降的主导因素。从质量守恒方程出发,建立反映含水层渗流场和变形场耦合的三维应变模型,探讨抽取深层地下水引起含水层形变的机理;运用有效应力理论,推导了承压含水层地下水运动方程,得到承压含水层形变与地下水头降深的关系。

Land subsidence is one of primary factors,which contribute to the longitudinal deformation of Shanghai Metro shield tunnel.Land subsidence of Shanghai is predominantly caused by groundwater pumping.Three-dimensional strain model of the aquifer is deduced according to mass balance equation.The model couples the seepage field with deformation field of aquifer,then,the mechanism of deformation of aquifer is discussed.The relationship of deformation of aquifer and hydraulic head is also deduced in view of the theory of effective stress.This paper will provide a reference for the study on the land subsidence caused by groundwater pumping and its effects on the longitudinal deformation of Metro tunnel.