水文地质工程地质2018，Vol.45Issue(3)：14-21,8.DOI:10.16030/j.cnki.issn.1000-3665.2018.03.02
基于变渗透系数的地下水开采-地面沉降三维模拟研究
Three dimensional simulation of groundwater exploitation and land subsidence based on variable permeability
摘要
Abstract
Porosity and permeability of soil keep on changing during the process of land subsidence.However,these are often ignored in order to reduce the computation in the simulation,thus the simulation results may deviate from the actual situation.In order to examine the influence of variable porosity and permeability on the simulation results of subsidence,a 3D consolidation model considering the variation in permeability during consolidation is established based on the coupling of the Biot consolidation theory and Kozeny-Carman equation.Pumping simulations are carried out under the condition of considering and neglecting the variation of permeability in the typical aquifer structure in the Beijing plain.It is found that the change in the layer permeability after pumping is uneven,and the permeability is reduced near the well wall.Considering the change in permeability,the final deformation of the surface is larger than that of ignoring the variation in permeability.The simulation error caused by neglecting the variation in permeability is smaller and has a tendency to develop in the early stage of settlement,and it is larger and more stable in the middle and later stages.This error is positively correlated with the pumping volume and is negatively correlated with the compression modulus and permeability of confined aquifer.With the increasing thickness of the confined aquifer,the error first increases and then decreases.关键词
渗透系数/北京平原区/地面沉降/渗透固结Key words
permeability coefficient/Beijing plain/land subsidence/seepage and consolidation分类
天文与地球科学引用本文复制引用
李莎,成建梅,宫辉力..基于变渗透系数的地下水开采-地面沉降三维模拟研究[J].水文地质工程地质,2018,45(3):14-21,8.基金项目
国家自然科学基金重点项目(41130744) （41130744）
国家自然科学基金面上项目(41171335) （41171335）
