Research On The Ground Settlement And Site Stability Caused By The Goaf Of The Existing Building Site

Guizhou province is a big coal producing province in China,and its coal mines are almost in the mountains.The characteristics of surface movement and deformation caused by underground mining in mountain mines are obviously different from those in plain area.If the existing mining subsidence theory is applied to the mountain area it will cause errors,which will make the planning and pillar layout of the mining area unreasonable,which will cause the waste of land resources and coal resources in the mountain area.The study of the influence of underground mining on the stability of building foundation is of great practical significance for improving the land utilization rate and guiding the construction planning of mining area.This paper takes the Guizhou Hezhang power plant is Weah factory as the research object,using probability integral method and key layer theory predict the surface deformation of the existing plant;simulation of coal mine underground repeated mining deformation law and character of overburden soil dynamic process by Midas/GTS;using the stress ratio method to analyze the sinking basin built(structure)stability of building foundation,and further use of Midas/GTS simulation in the building(structure)to build the load and coal seam under the interaction of foundation deformation.On this basis,the stability of the built(structure)foundation in the study area is preliminarily evaluated.Through the research of this subject,the following main research results are obtained:(1)through the prediction of the surface deformation of probability integral method and key stratum theory,we know that the stability of the site in the southeast and middle south of the existing plant is mainly affected by the surface tilt and the horizontal deformation of the surface.(2)in the process of repeated coal mining,the range of surface subsidence and the horizontal movement of the surface are increasing,and moving towards the existing power plant.(3)under the double action of coal seam mining and building load,the foundation(structure)foundation at the edge of the subsidence basin is mainly affected by the deformation of uplift and the horizontal deformation.(4)the comprehensive theoretical results and numerical simulation results on the stability of factory foundation is evaluated,according to the risk level,the existing coal mining area of southeast area for the foundation to determine the extremely unstable area,South West and north to determine plant plant foundation basically stable area and determine the foundation for stable region.