Research on the subsidence law of open pit slope on the condition of underground mining

Many coal resource have been mined through pit mining in many surface coal mine,however the problem of instability and subsidence of the slope in surface coal mine have been aggravated to a certain extent.It induced strata movement and surface subsidence that is a complex physical and mechanical changing process.Based on Anjialing surface coal mine and the No.1 pit coal mine,firstly,the subsidence situation of the goaf,characteristics,genetic mechanism and the affections to the surface coal mine were analyzed;secondly,the simulation and prediction to the subsidence of the goaf were taken through the Probability Score Method and FLAC3D,and the slope deformation and destruction mechanism were studied on the condition of open-pit combined mining,the theory which contains the peculiar deformation of surface mine slope,stress distribution characteristics,formation mechanism and mining subsidence rules were revealed under the affection of pit mining.The conclusions of this thesis are quite significant towards the same types of open-pit combined mine.