Study On Damage Mechanics Of Groundwater And Control Methods In The Mining Of Shallow Embedding Coal

The jurassic coalfield in the north of ShaanXi locates in the edge zone of Maowusu desert, short of water, friability entironment. The coal with the characters of shallow embedding,thick mine,thin terrane,thick incompact superstratum, is a type of shallow embedding exploitation with the condition of thin terrane and thick incompact superstratum. After the jurassic coalfield come upon the time of large-scale developing, the action of building frequently, ground collapsing and water level falling exacerbating day after day, the developing of coalfield will be the dominant factor of accelerating desert. Developing the coalfield in the north of ShaanXi, and protecting the lacking resource of water in the north of ShaanXi, are fateful problems of which crying for solve in the constructing of ShaanXi base of energy sources, not only connect to continuable developing, but connect to the energy sources developing tactic of country.This text according to the investigating of mining subsidence actuality and geological section at mined area in ShenFu coalfield shallow embedding coal, analyzing mechanical character of terrane before and after breaching, and the status of movement conducing cracks develop in superstratum. Useing the key strata theory of the ground, link to F-RFPA numerical analysis, the characteristic parameters of the key terrane and the degree of breaching are simulated in text. Present the relation of mining height and stability of key strata after breaching, and the stability affect the degree of destroy to aquifer. Result in, in the condition of ShenFu coalfield, the stability of key strata after breaching not only lie on the character parameters of key strata, but also relate to mining height and immediate roof height, by limit mining height could make key strata after breaching stably, avoiding strata cut-in work face, achieve protecting groundwater.This text based on the studying of protecting groundwater, combining geological, mining, landform and entironment of DaLiu coalfield, make a discussion of protecting groundwater mining and protecting entironment model, from the subarea of DaLiuTa coalfield.