| With years of rapid economic development,my country has had a particularly large demand for energy.The current main energy source comes from coal in my country.After coal mining is over,the entire mine and a certain area around it will form a goaf due to ground subsidence.Although my country has a vast land area,there are relatively few sites suitable for arable land and construction,and most of the areas are mountainous and hilly areas.In order to meet the sustainable development requirements of the domestic economy and make rational use of existing land resources,we need to remediate and re-use the current abandoned goaf areas.Therefore,we need to conduct stability assessments on the goaf sites.The most important of these is to predict the remaining deformation of the surface of the goaf.This paper takes the residual deformation of the surface of the coal mine goaf in Jiaozuo City and Xiang district as the research object,analyzing the geological structure conditions in the area and the influence of the goaf on the surface mining subsidence,and combines various on-site exploration report data and the coal mine work Data,determining the factors affecting the remaining deformation of the goaf and understand the law of the remaining deformation of the goaf site.According to the calculation of the remaining movement deformation of the goaf site according to the requirements of the code,the size of the remaining deformation of the goaf and its influence range are determined,which provides guidance for the safe construction of the Hexiang community on the goaf site.main tasks as follows:(1)Through various geological exploration reports and mine work data within the mined-out area,the damage mechanism of the overlying rock strata over the mined-out area is analyzed,and the reasons and generalized residual deformations in the goaf are studied based on the characteristics of the formation of the "three zones" and changing law;(2)Establish a dynamic prediction model of residual deformation based on the movement deformation of any point in the three-dimensional space of the goaf surface and the normal time distribution function,and use MATLAB programming to calculate the residual subsidence of the movement and deformation of the ground surface in the evaluation area in all directions.,Residual horizontal movement,horizontal deformation,inclination,curvature and the contour map along the strike and inclination,and the maximum residual subsidence value of the goaf surface is 41.5mm,the maximum inclination value is 1.2mm/m,and the maximum residual The horizontal movement is 3.8mm,the maximum horizontal deformation value is 2.46mm/m,and the maximum curvature is 0.1221 1/km.When analyzing the applicability of the prediction model,it is confirmed that the model has a certain applicability and can meet the requirements of engineering construction. |
