Recognition Method Of Surface Destruction Zone In Mountainous Mining Area

China is a country riched with coal mine.During the underground mining,the surface is subjected to different degrees of damage which includes early continuous deformation and late crack,slide,debris flow and other non-continuous destruction,which endangers seriously the safety production in mining area.Therefore,there is a very important theoretical value and practical significance to predict and analyze the surface damage area under the coal mining and automatically identify broken boundaries.This paper is based on the research of the coking coal mine area in Shanxi Province,mining prediction parameters on the basis of the field observation data is calculated.Applying the probability integration model,the terrain is simulated.In this paper,Finite Element in Elastic Mechanics is used to analyze the surface tensile damage area and a boundary algorithm is proposed to automatically identify the damaged region.At last,the result is expressed dynamically by OpenGL technology.The following work has been mainly carried out in this paper:1.Based on monitoring data of the surface of mining area,the parameters of mining subsidence on the base of terrain and geological parameters of the mining area is calculated.The surface deformation value of the terrain is predicted according to the parameters and the probability integral model.2.the deformed terrain is preprocessed to remove the repeated points in the grid partitions.Then,the convex hull boundary of the study area is generated,generating method of the surface triangulation from outside to inside is studied,which can improve the algorithm when looking for the third point with triangle subdivision rules to optimize the triangulation speed.3.Surface and topsoil triangulations and the finite element method in elastic mechanics are applied to study the surface tensile damage.Overlay analysis is performed on the base of the above results and mining subsidence boundary toextract the damage area.An automatic identification algorithm of fracture triangular network boundary is raised by maximum right angle principle.4.Applying the OpenGL technology,3D visualization of the damage area in the study area is realized.