Research On The Influnence Of Mining On The Stability Of Slope And The Countermeasure In The Panel No.2 Of Cha-jiaotan Coal Mine

The coal exploitation under mountain areas easily results in the deformation,stress redistribution and probably induces geological hazards such as landslides,collapse and the surface uneven settlement,and destroys the ecological envrironment and even threats the common life of the people who live in the mining area.With the interdisciplinary nature and complexity,the study of landslide induced by mining involves the analysis of ming and geological landform condition,the main factors of the slope stability,stress and strain in the groud movement and deformation,slope stability prediction,disaster prevention and reduction and other issues.Based on studying on the topographic features,geological structures,mine production technology,the article ensures the slope safety factor by theoretical analysis and computer numerical simulation and proposes some prevention measures which are scientifically safe and economically reasonable.The main research results are as follows:Based on the analysis of geological and mining conditions,the article build FLAC3 D numerical simulation mode under mountain surface,and analyze ground movement and deformation afer the coal mining of C25 and C19,and results show the maximun subsidence and the surface horizontal movement respectively reach to 2150 mm and 900 mm,the development height of fracture zone of overlying bedrock is 120000 mm,and the residential buildings damage reach to level IV in the mining effect range;The article analyzes the change of slope safety factor of before and after the mining and acquires the method for determining the paramters of theoretical calculation under the influence of mining with the numerical simulation results and constructs the theoretical calculation model of slope stability under the influence of mining;Compared with all mining and set safe protection coal pillar in No.1slope residential area severally estimated,it shows the additional cost of prevention and control of surface hazards of tons of coal respectively are 21.83 and 19.17,and proves theground surface disaster prevention and mitigation effect by three-dimensional geological moder under protection coal pillar.