The Influence Of Underground Mining On The Stability Of The Foundation

Guizhou province is a major coal producing province in china.Almost all the coal mine is located in the mountains.The mountain caused by underground coal mining subsidence deformation characteristics and plain areas have the obvious difference.If the existing theory of mining subsidence is completely applied to the mountain.That would produce error and lead to the mining ground built(structure)planning and building coal pillars' s unreasonable,which will cause the waste of land resources and coal resources in mountainous.The study on the influence of underground mining on the stability of the building foundation is of great practical significance to improve the land utilization ratio and the mining area planning.This article take the Guizhou Hezhang Weihe Power Plant as the research object,using probability integral method and the key strata theory to predict the deformation of the surface to the plant area;simulating the deformation law and characteristics of overlying strata in the process of underground mining by;using the stress ratio method to analyze the sinking basin the building(structure)building foundation stability.Further more,this paper simulate the deformation of the foundation under the combined action of the construction(structure)and the coal mining by using.On this basis,the stability of the foundation of the building in the study area is evaluated.Through the research of this subject,the following research results are obtained:(1)By means of the probability integral method and the critical layer theory,it is found that the stability of the proposed site is mainly affected by surface tilt deformation and surface horizontal deformation.(2)The surface subsidence and the horizontal movement range and the value of the surface are increasing in the process of coal mining.Meanwhile,The scope of influence moves to the factory.(3)Under the double action of coal mining and building load,the foundation at the edge of the subsidence basin is mainly affected by uplift deformation and horizontal deformation.(4)The theoretical prediction and numerical simulation results are used to evaluate the stability of the foundation.According to the hazard grade,the southeastern part of the coal mining area of the proposed plant is judged to be the extremely unstable area of the foundation,and the middle and southern part of the plant is judged to be the basic stable area of the foundation,and the western and northern parts of the plant are judged as the foundation stability zone.