深基坑降水与地面沉降变形三维耦合数值模拟

以比奥固结理论为基础，考虑土体的非线性特征及土的渗透性随应力状态的动态变化，将地下水渗流场和土体应力场进行耦合，建立了深基坑降水与地面沉降变形的水土全耦合三维数学模型，并采用三维有限元数值分析方法，以上海市环球金融中心深基坑降水为例，模拟预测了基坑中心水位降至标高-23．4m时基坑周围地下水渗流场与地面沉降变形场的分布特征．结果表明，该模型稳定性好，收敛速度快，能模拟复杂三维地质体和整个基坑降水工程的结构。

Three dimensional coupled numerical model between deep foundation pit dewatering and land-subsidence

Based on Biot's consolidation theory,a three dimensional full coupling-model between see-(page an)d stress was established,which considered the non-linear characteristics of soil and the dynamic change of permeability coefficient with the stress state.The finite element analysis method was used to simulate and forecast the character of groundwater seepage and land subsidence distorion around the foundation pit when the groundwater level of the foundation pit center was declined to-23.4 m in Shanghai HuanQiu Finance Center foundation pit dewatering.This model can simulate the structure of three dimensional complex geologic formation and the whole foundation pit.It has good stability,quick convergent speed,and significant values in actual project.