开采地下水引起地面变形的分析

本文模拟开采地下水引起的地面变形机制，建立了一个分析开采地下水引起的地面变形的有限元方法。这个方法可以考虑由于开采地下水引起的土自重的变化，土承受的渗透力的变化，以及承压含水层中水压力及渗透力的变化。在分析中还考虑了土的非均质性及力学非线性性能。分析了一个算例以说明这个分析方法的功能及其适用性。分析结果表明，开采地下水引起的沉降和径向变形对工程的影响是同样重要的，它们在数值上具有相同的数量级；而且，沉降主要是由土自重的变化引起的，径向变形主要是由渗透力的径向分量的变化引起的。此外，这个分析方法可以把开采地下水做为一个过程，分阶段地分析所引起的地面变形

PPAEGSSANALYSIS OF GROUND DEFORMATION INDUCED BY EXTRACTING GROUNDWATER

In this paper,a FEM for analyzing ground deformation induced by extracting groundwater is developed based on the deformation machanism.The effects of changes of earth mass weight,seepage forces and water pressure in water-bearing stratums induced by extracting groundwater,as well as the nonlinear bavaviors of soils can be taken into account in this method.An example is analysed in order to show the functions and suitability of the method.The results show that the quantitative order of radial deformation is same as that of settlement and both of them have the same important influence on engineering;but the settlement is mainly induced by the changes of earth mass weight,and the radial deformation is mainly induced by the changes of radial seepage force.Moreover,in the method,the extraction of groundwater can be considered as a process and the ground deformations induced by extrating groundwater can be analysed stage by seage.