Engineering Application And Predicting Model Of Surface Subsidence Caused By Groundwater Exploitation

Exploitation of groundwater can cause uneven subsidence of ground surface. If it can not be disposed well, a lot of environment calamities such as collapse of building and fracture of underground pipe lines, can occur. There are two kind methods of studying surface subsidence caused by ground water exploitation project. One is classical geomechanics method which is on the basis of Terzghi's one-dimension consolidation theory and Biot's three-dimension consolidation theory, the other is mathematical method on the basis of stochastic medium theory presented Liu Baochen and Yang Junsheng. The thesis introduces the Biot's three-dimension consolidation theory based on absolute linear-elastic theory; The thesis designs the pit dewatering scheme of hand-dug piles support of ShenYang subway's ShenYang station construction; The thesis uses finite element program to simulate the influence on around environments caused by pit dewatering, and finds the change laws of earth mass inner stress and the effect parameters on the surface deformation on the basis of reasonable hypothesis and the analysis of ground water exploitation progress. Combined with stochastic medium theory, the thesis introduces dewatering subsidence coefficient , sets up the predicting model of the surface deformation caused by dewatering, and develops the computing program; By application of program on a single well of underwater exploitation , it is proved that the program is feasible, so the prediction of the surface deformation caused by underwater exploitation is realized. Finally, the thesis uses the program to calculate surface subsidence caused by groundwater loss in a coal mine of Xuzhou and the surface deformation caused by pit dewatering at the Shenyang station in the process of construction of subway.