摘要
系统分析了常州地区地下水开采动态和地面沉降发生发展历史,概述了研究区地面沉降的框架,在此基础上,系统研究了常州市分层标从1984年至2002年的分层沉降资料。根据常州地区地下水含水层系统及土层特性,将研究区松散土层垂向划分为四个不同层次,分别研究了它们的压缩变形历时特性及其与累计地下水开采量的关系,研究了各自的应变特性。由于土层结构及物理力学性质的不同、地下水开采层次及强度的差异、土层不同应力历史的影响等诸多因素的综合效应,导致了地面沉降及分层压缩特性的显著差别。常州地区的主要压缩层为第II承压含水层的顶板弱透水层,与含水层距离近的土层变形量及应变量均较大,其次是第II承压含水层本身及其与第III承压含水层之间的弱透水层。地面沉降及地层压缩与地下水开采之间的滞后效应在常州地区表现得并不明显,这一点至少在月或年的时间尺度上是正确的。
It is systematically analyzed in this paper that the history of groundwater withdrawing dynamics, and the history of land subsidence developing, and drawn the outline of the regional land subsidence of the research area. Then it is firstly and systematically presented the layered compressible data of borehole extensometer in Changzhou area from 1984 to 2002 in this paper. Based on the Characteristics of Aquifer system and properties of soil layers, the porous soil layer in the research area is divided into four different compressible layers. The characteristics of cumulative compressible deformation and its strain and the relationship of deformation versus cumulative groundwater quantity pumping of each layers is studied respectively. The considerable difference of land subsidence and layered compressible deformation due to groundwater pumping is the effect of soil layers properties and their structures, groundwater pumping aquifer and strength, the stress - history of soil layers, etc. The main compressible layer is the top aquitard layer of second aquifer, the deformation and strain value is inversely proportional to the distance from the aquifer, the next main compressible layer is the second aquifer layer and the down aquitard layer of second aquifer. The deformation lag of each soil layer is not distinguished in Chang - zhou area.
出处
《地质与勘探》
CAS
CSCD
北大核心
2009年第5期612-620,共9页
Geology and Exploration
基金
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)之子专题"苏锡常地区地面沉降地质结构三维可视化模型研究"资助
关键词
分层标
地面沉降
地层压缩特性
常州
borehole Extensometer
land subsidence
characteristics of compression of soil layers
Changzhou
