学术
苏锡常地区非线性地面沉降耦合模型研究
于军[1,2] 吴吉春[3] 叶淑君[3] 吴剑锋[3] 王光亚[4] 张云[3]
[1]吉林大学博士后流动站,长春130026 [2]江苏省地质调查研究院博士后工作站,南京210018 [3]南京大学水科学系,南京210093 [4]江苏省地质调查研究院,南京210018
摘 要:
长期过量开采地下水所引发的地面沉降是一个复杂的非线性变化过程,对其进行数值模拟时,如不考虑沉降发展过程中模型参数的非线性变化,会给预测带来很大误差。本文依据苏锡常地区实际资料,通过典型钻孔土力学试验,确定出土体在不同荷载条件下的弹塑性和蠕变特征方程以及土体渗透系数随孔隙度变化的关系式。在此基础上建立了研究区三维变系数地下水流模型及考虑土体垂向不同变化特征（弹塑变或蠕变）的一维区域沉降模型,并采用多尺度有限单元法对模型进行了真正意义上的耦合求解。[著者文摘]
文章出处:
《水文地质工程地质》-2007年34卷5期 -11-16页
栏目信息:
分 类 号:
文献标识码:
A
文章编号:
1000-3665（2007）05-0011-06
Research on nonlinear coupled modeling of land subsidence in Suzhou, Wuxi and Changzhou areas, China
YU Jun, WU Ji-chun , YE Shu-jun, WU Jian-feng , WANG Guang-ya, ZHANG Yun （ 1. Postdoctoral Program of Jilin University, Changchun 130026, China ; 2. Postdoctoral Fellowship of Geological Survey of Jiangsu Province, Nanjing 210018, China; 3. Department of Hydro-Sciences, Nanjing University, Nanjing 210093, China; 4. Geological Survey of Jiangsu Province, Nanjing 210018, China）
Abstract:
Land subsidence resulted from the long-term over-exploitation of groundwater in Suzhou, Wuxi and Changzhou areas （Su-Xi-Chang Region） endures a complicated nonlinear evolution. Obviously, distinct simulation errors would inevitably come out if the nonlinear evolution of varying parameters were neglected in land subsidence modeling. According to the historical records .of the study area and the geotechnical results of soil test for the samples from the typical borehole, in this paper governing equations describing the different deformation characteristics （viscous-elastic, plastic or creep） of soil layers in Su-Xi-Chang Region are presented under different loading/uploading stress conditions. Meanwhile, an experimental relationship of hydraulic conductivity of soil layers versus void ratio is determined in this study. Moreover, the 3-D groundwater model and 1-D subsidence model based on visco-elastic-plastic constitutive relationship are coupled into a nonlinear model to simulate the groundwater flow and the land subsidence in Su-Xi-Chang Region. Then the multi-scale finite element method is used to solve the nonlinear coupled model with the varying parameters. The results based on MsFEM are satisfactory, which shows that the coupled model developed in this study will provide sound basis for early warning and forecasting of the future land subsidence in the Su-Xi-Chang Region.[著者文摘]
Key words:
land subsidence; groundwater; coupled model; multi-scale finite element method
基金资助:
国土资源部、江苏省政府合作项目“江苏省生态环境地质调查与监测”（200312300009）之予专题“苏锡常地区地面沉降地质结构三维可视化模型研究”
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