Study On Temporal And Spatial Variation Of Residual Ground Movement And Deformation In The Mountains Mining Area

Most of the coal mines in our country are located in the mountains.After a period of exploitation,the mountain coal mines have formed a large area on the surface.It caused great damage to the mining environment.With the rapid development of national economy,a large number of construction projects are built on empty areas.In mined-out area,we build industries and buildings above the surface,and the surface stability evaluation is a very important problem.And the main factor affecting the stability of goaf is the size of the residual movement and deformation,that is,the amount of the residual deformation and the length of the residual duration directly influences the deformation of the buildings and the other facilities.To solve these problems,this paper mainly done the following work:(1)On the basis of the coal mine goaf surface subsidence data,this paper deals with the measured data,topographic map.According to the principle of mining subsidence and the analysis of the mining overburden rock dynamic movement,this paper reveals the regular of the residual movement and deformation,and gets the influencing factors of residual deformation,such as the nature of the overlying strata,coal mining and roof management method,wide working face mining in depth ratio,face location and duration,etc.(2)This paper analyzes the mechanism of the residual deformation,and obtains the partitioned property of the residual deformation of the mined-out area.Using probability integral method to determine the expected parameters,and establish the residual deformation prediction model.(3)Using the mined-out area of the surface topography of surveying and mapping in different periods,this paper analyzes the surface elevation changes by the macroscopic area before setting the surface observation station of the same goaf.By comparing the changes of the area elevation value in the area of subsidence value,andcompared with the observed data,getting the residual subsidence in the area of values.(4)According to the creep properties of residual deformation,this paper establishes the negative exponential correlation function of residual deformation value and the duration.And this paper uses the topographic map data of surveying and mapping in different years in Xi Qu,and verifies the correctness of the correlation of the residual subsidence.