Subsidence Rules Analysis Of Flat Coal Mine Ground Collapse In Inner Mongolia

As the strong development of Inner Mongolia coal resources in recent years,the ground collapse in goaf which is caused by gently inclined coal seams becomes one of the pressing geological environment problems in Inner Mongolia coal mines.At the basis of previous study on ground collapse classification in coal mining,the characteristics of collapse types of gently inclined coal seams are described and analyzed in the paper.The gently inclined coal seams are classified by their collapse types,the distribution of various collapse types in Inner Mongolia investigation areas and the development patterns are described qualitatively,the development status of some certain collapse types under different landforms,mining methods and geological conditions is determined,and ground collapse of gently inclined coal seams in the area is grasped entirely.To quantitatively study the collapse rule of gentle inclined coal seams,the subsidence basin type which occurs frequently in Inner Mongolia investigation area is selected herein to study the ground collapse rules:Take Dayan mine for example,the deformation conditions of subsidence basin of Dayan mine is monitored by GPS.According to related requirements of second order leveling,general monitoring points are measured by the coordinate of control points,monitoring points along the trend and tendency of coal seams are arranged,monitoring statistics are recorded,each point displacement is counted,and the promoting situation of working faces is denoted as well as relative subsidence curves are drawn through CAD.Study on the collapse rules is based on monitoring data of ground deformation of Dayan mine,formation mechanism analysis of subsidence basin,and proper function is completed by MATLAB2012a,collapse-time function fitting is conducted by selecting some special points such as marginal points at.working face and goaf affecting range,etc.With all the analysis above,this thesis has come to some results of ground collapse rules as following:the gently inclined coal seam collapse is divided into basic types and associated types,this thesis will deeply divide the basic types;This thesis will conclude the position and part of the gently inclined coal mine ground collapse,and get the development rule of collapse;based on the result of ground movement monitoring,this thesis will get the relation of collapse&time by function fitting,and the rules of coal seam and tendency collapse.