Distributioncharacteristicofsurfacecracksat Thebottomofopenminingpitinuppergoafarea

Along with the social and economic development,the demand for natural resources is also increasing.As a non-renewable natural resource,mineral resources are over-exploited and utilized,which has brought great damage to the geological environment and great inconvenience to People’s Daily life.Among these geological disasters,ground fractures are widely distributed,abundant and harmful.Therefore,in-depth research on the distribution characteristics of ground fractures is of great significance for the prevention and control of ground fractures.In the era of rapid development of computer technology and continuous expansion of application scope,geological 3D modeling program is a typical case of the combination of data age and industry.Building a digital mine and using 3D spatial modeling technology to model strata,structure,magmatic rock and ore body is the fundamental to realize mine visualization.In this thesis,using the geophysical detection technology combined with geological radar and high-density electrical method and 3Dmine mining engineering software,the distribution characteristics of surface cracks were studied in Changhonggou Coal Mine as the research area.Firstly,on the basis of geologic map,field investigation data and related statistics of the research area,the geological background of the study area was analyzed,and the geological radar and high-density electrical detection techniques were used to obtain the regions where faults and surface fractures occurred in the study area,as well as the spatial distribution information of topography,groundwater and geological structure in the study area,so as to construct the relevant information set of ground fractures.Secondly,3Dmine mining engineering software was used to construct geological borehole database,surface model,stratigraphic model and fault model for threedimensional visualization of the study area,and more directly and specifically observe the distribution characteristics of faults and surface fractures.Based on this research,we get the spatial geographical data and the distribution characteristics of the ground fractures.The main distribution of the ground fractures in the research area in the south side of the coal seam floor of No.16 open pit,with varying sizes,generally more than ten meters to dozens of meters in length,in the shape of straight,broken,arc and bifurcation.The fault is located on the west side of the mining pit and slopes to the west,with a dip Angle of 56 ～ 79 degrees and a surface extension length of63.5 meters.It is found by geological radar detection that the depth of 0 ～ 6 meters in the same phase axis dislocation is obvious,and there are obvious differences between the strata on both sides of the section.At the same time,according to the geological data and other relevant information obtained by comprehensive geophysical detection technology,3Dmine modeling software was used to visualize the study area.According to the surface model,stratum model and fault model established in the study area,it was concluded that the location of ground fractures in this area was consistent with the situation of field survey.By studying the distribution characteristics of ground fractures,it can lay the foundation for subsequent mining operations and afford data support for the development of the mining area itself,Which is of great practical importance.