南通市建筑荷载和地下水开采引发地面沉降模拟预测  

Simulation and prediction of ground subsidence caused by structure loads and groundwater extraction in Nantong

作　　者：李子义 骆祖江[1] 杨璐 张也 Li Ziyi;Luo Zujiang;Yang Lu;Zhang Ye(School of Earth Science and Engineering,Hohai University,Nanjing 211100,China;Jiangsu Geological Engineering Survey Institute,Nanjing 211102,China)

机构地区：[1]河海大学地球科学与工程学院,南京211100 [2]江苏省地质工程勘察院,南京211102

出　　处：《工程勘察》2023年第2期38-45,共8页Geotechnical Investigation & Surveying

基　　金：国家自然科学基金项目(NO.41874014)。

摘　　要：为准确模拟南通市地面沉降的机理及分布规律,采用Biot固结理论,将土体的本构关系拓展至粘弹塑性,利用全耦合模型对参数的动态变化进行分析,建立南通市建筑荷载、地下水开采与地面沉降关系的三维数学模型。参照近年资料对模型进行识别验证后,模拟预测了2016年8月到2025年8月各含水层在建筑荷载、地下水开采及两种因素共同影响下压缩而引起的地面沉降发展趋势。研究结果表明:建筑荷载对潜水含水层和第Ⅰ粘性土弱含水层压缩量影响最大;地下水开采对各承压含水层压缩量影响最大;二者共同作用下对第Ⅰ承压含水层压缩量影响最大。建筑荷载和地下水开采共同作用产生的沉降量小于分别作用时产生沉降量的线性之和,分析认为是两种因素在沉降上的耦合效应所致。In order to predict the occurrence,development trend and impact of ground subsidence in Nantong,by using Biot consolidation theory,the constitutive relation of soil is extended to viscoelastic plasticity.The fully coupled model is used to analyze the dynamic changes of the parameters,and a three-dimensional mathematical model with structure load,groundwater extraction and ground subsidence in Nantong is established.After identifying and verifying the model in combination with recent data,the simulation predicts the development trend of land subsidence of each aquifer from August 2016 to August 2025 under the influence of structure load,groundwater exploitation and the two combined factors.The results show that the structure load has the greatest effect on the subsidence of the phreatic aquifer and the weak aquifer in the cohesive soil I;the groundwater extraction has the greatest effect on the subsidence of each confined aquifer;the combined action of the two factors has the greatest effect on the subsidence of the first confined aquifer.The subsidence caused by the combined action of structures load and groundwater extraction is less than the linear sum of the subsidence caused by their respective actions,which is caused by the coupled action of the two factors on the subsidence.

关 键 词：比奥固结理论 地下水开采 建筑荷载 地面沉降 

分 类 号：P642.26[天文地球—工程地质学]