摘要
针对江阴南部地面沉降问题,结合地下水开发利用现状和城市建设规划,根据比奥固结理论,引入黏性土流变理论,将土体本构关系拓展至黏弹塑性,并考虑土体的土力学参数和水力学参数随应力场的动态变化,建立江阴南部地区建筑荷载、地下水开采与地面沉降三维全耦合数值模型,分别模拟预测了江阴南部地区2015年12月31日至2030年12月31日建筑荷载、地下水开采单独作用及二者叠加作用三种情况下地面沉降发展趋势.模拟结果显示,建筑荷载为引起江阴南部地区地面沉降的主因,其次是地下水开采,二者的主压缩层分别为第Ⅰ黏性土弱含水层和第Ⅱ黏性土弱含水层,分别占总压缩量的42.94%和62.60%;建筑荷载和地下水开采叠加作用下引发的地面沉降具有耦合效应,二者叠加量小于单独作用引发量的线性叠加.
Objectives:Due to the long-term over-exploitation of groundwater and the rapid development of urbanization,a large area of land subsidence has taken place in the Suzhou-Wuxi-Changzhou area.The southern Jiangyin area is one of the most serious areas of land subsidence.In order to find out the reasons for the formation and development trend of land subsidence in southern Jiangyin area,at the same time,in order to determine the impact of building load and groundwater exploitation on land subsidence in southern Jiangyin area,combining the present situation of groundwater development and utilization urban construction planning,a three-dimensional fully coupled numerical model of building load,groundwater exploitation and land subsidence in southern Jiangyin area was established.Methods:Based on Biot's consolidation theory,a three-dimensional fully coupled mathematical model of building load,groundwater exploitation and land subsidence in southern Jiangyin area was established.At the same time,the rheological theory of cohesive soil was introduced into the mathematical model,and the constitutive relationship of soil was extended to viscoelastic-plastic,and the dynamics of soil mechanics parameters and hydraulic parameters with stress field was considered.The development trend of land subsidence in the south of Jiangyin under three conditions from December 31,2015 to December 31,2030 is predicted by simulation,which were building load acting alone,groundwater exploitation acting alone and superposition of building load and groundwater exploitation.Results:The simulation results show that from 2015 to 2030,building load is the main factor causing land subsidence in southern Jiangyin,and ground water exploitation is the secondary factor.The main compression layer of land subsidence caused by building load alone is the first clay weak aquifer,and the compression amount produced by the main compression layer is 42.94%of the total compression amount.The main compression layer of land subsidence caused by groundwater exploitation alone is the weak aquifer of the second clay,and the compression amount produced by the main compression layer is 62.60%of the total compression amount.The land subsidence induced by the superposition of building load and groundwater exploitation has a coupling effect,and the compression produced by the superposition of the two is less than the sum of the compression caused by the single action.Conclusions:Based on Biot's consolidation theory,the three-dimensional fully coupled model of building load and groundwater mining and land subsidence in southern Jiangyin area can more accurately simulate the process of land subsidence under different conditions,and further improve the accuracy of land subsidence calculation.Three-dimensional fully coupled numerical model of building load,groundwater exploitation and land subsidence in southern Jiangyin can be used to evaluate the impact of groundwater exploitation and major engineering construction on Jiangyin City,and provide countermeasures and suggestions for the prevention and control of land subsidence in southern Jiangyin.
作者
宁迪
骆祖江
葛伟亚
贾军元
NING Di;LUO Zujiang;GE Weiya;JIA Junyuan(School of Earth Science and Engineering,Hohai University,Nanjing,211100;Nanjing Center,China Geological Survey,Nanjing,210016)
出处
《地质论评》
CAS
CSCD
北大核心
2019年第6期1549-1558,共10页
Geological Review
基金
国家自然科学基金(编号:41874014)
苏南现代化建设示范区1∶50000环境地质调查(编号:DD20160245)的成果
关键词
江阴南部
建筑荷载
地下水开采
地面沉降
southern Jiangyin
building load
groundwater exploitation
land subsidence
