Analysis Of Surface Deformation And Optimization Of Mining Scheme For Mining Under Buildings In Jinzhuang Coal Mine

Jinzhuang coal mine 8210 panel corresponding surface area has a building,it will cause the overlying strata movement and surface deformation after mining,when the deformation of the surface exceeds the non-deformability of the building,it will cause deformation,damage even collapse of the building,causing security risks.Therefore,study on the deformation law of the surface after mining,develop a comprehensive mining scheme,which has an important guilding significance to guarantee the safety of surface building of Jinzhuang coal mine.Based on the geological conditions of coal mine,the occurrence conditions of coal seam and the minings conditions of panel,the mining technical conditions of Jinzhuang coal mine is determined.The study of characteristics of surface movement and the deformation of 8210 panel existing mining scheme,the damage level of the buildings after current mining method is determined.According to the situation of mining,based on the strata movement angle and the field investigation of the adjacent mined panel,three optimization schemes are designed and put forward to protect surface buildings.Comprehensive use of theoretical analysis,laboratory tests,numerical simulations and other research methods,study on the surface movement and deformation characteristics of different mining schemes,the damage degree of different mining schemes to the surface buildings is analysed,make a comprehensive comparison to optimization mining schemes from analysis of buildings damage grade,the waste of resources and economic losses,determined the prioritization mining schemes eventually.The method of field monitor is used to study the damage degree of the surface movement and deformation after the optimization scheme mining,the theoretical and numerical results are vertified.The results show that,adopting plan 2 to mining,the width of protection on both sides of the buildings is 122 m,the width of building is 23m,in the range of 267 m mining height is 3.90 m,no caving mining methods,it can not only ensure the safety of buildings,but also reduce the waste of resources and economic losses,it provides a theoretical basis and scientific basis for Jinzhuang coal mine safe and efficient production.