STUDY ON LAND SUBSIDENCE INDUCED BY PUMPING GROUNDWATER WITH THREE-DIMENSIONAL FINITE ELEMENT OF WATER AND SOIL COUPLING

摘要

Three-dimensional mathematic model, which is about unsteady flow of pumping groundwater, is built according to the conditions of hydrogeology and engineering geology of Xin Ye mansion in Hankou, Hubei, China. The existed numerical equation of three-dimensional unsteady flow of confined aquifer is used to solve it, concrete numerical formulae of source-sink item are emphatically discussed. It is briefly introduced that three-dimensional finite difference numerical equation is built according to Darcys law and water equilibrium principle. Nonlinear compressive equation of land subsidence induced by pumping groundwater is derived from effective stress and compressive principle of soil, and corresponding calculation programs of finite element and finite difference are developed. Finally this environmental geotechnical engineering problem is analyzed and evaluated by the calculation program of three dimension finite element, the calculated result accords well with the surveyed.