天津市地面沉降数值模拟研究

地面沉降是天津市的主要环境地质问题。造成天津市地面沉降的原因很多，但主要原因是大量开采地下水。本文重点研究开采地下水条件下的地面沉降数学模型及模拟，为控制地面沉降提供科学依据。通过对第四系的水文地质条件分析，建立第四系的水文地质概念模型和地层压缩概念模型，并建立相应的准三维水流数学模型和一维地层压缩数学模型，两者通过含水层水头和弱透水层粘性土中孔隙水头的内在联系耦合在一起。利用以往系列水位数据和沉降数据对模型进行标定，模型基本上反映了天津市地面沉降的实际情况。

Study of Numerical Simulation of Land Subsidence in Tianjin

Land subsidence,having caused enormous economical losses,is the major geological hazard in Tianjin.The reasons that cause land subsidence are very complicated and varied ,but the chief reason is over-exploitation of groundwater.This paper mainly describes the mathematical model of land subsidence caused by the exploitation of groundwater,and provides scientific basis for controlling land subsidence. Based on the analyses of hydrogeological condition of Quaternary strata,the paper builds the concept model of hydrogeological condition and strata compaction,and sets up the corresponding quasi-three-dimension groundwater flow model coupled by one-dimension strata compaction model.The coupled mathematical model was revised and tested by the previous data of groundwater level and land subsidence.