Study On Multi-scale Surface Deformation Monitoring And Building Damage Evaluation In Mining Area

Coal resources are an important material basis to support the development of national economy.With the large-scale coal mining,the surface has been damaged,causing surface cracks,building damage and other disasters,seriously damaging the ecological environment of the mining area.Therefore,carrying out surface deformation monitoring,obtaining deformation data,calculating relevant parameters and evaluating the damage of buildings in the mining area has important theoretical and practical significance for maintaining the sustainable economic development and ecological civilization construction of the mining area.Therefore,aiming at the problems of surface deformation and building damage caused by working face mining,combined with the reality of the mining area and based on different monitoring technologies,this paper monitors the deformation of the mining area and evaluates the damage level of damaged buildings.The main research results are as follows:(1)The temporal and spatial distribution information of surface deformation in the study area is obtained based on sbas-insar technology.In order to obtain the surface deformation information of large-scale mining area,the temporal deformation results of the study area are inverted by sbas-insar technology,the spatial distribution information of deformation area in the study area is obtained,and the deformation characteristics of coal mining area are analyzed.The results show that there are three large-area deformation areas in the study area,which are consistent with the distribution position of coal mines in the study area.The subsidence influence areas of the three deformation areas are 2.39 km2,5.35 km2 and 5.74 km2 respectively.(2)Based on the measured data of surface movement observation station,the surface fitting subsidence basin is carried out to obtain the surface deformation information of working face scale.Based on the measured data,the surface fitting model of subsidence basin in rectangular working face is established,and the three-dimensional model of subsidence basin in 2516 and 2521 working faces is obtained.The research shows that the maximum subsidence of the surface movement observation station of 2516 height limiting working face is 572 mm,and the maximum subsidence of the surface movement observation station of 2521 filling working face is703 mm.The surface fitting method is used to fit the subsidence basins of 2516 and2521 working faces,and the square sum of the difference between the fitting value of each monitoring point and the measured value is the fitting error.The test results show that the fitting error of the subsidence basin of 2516 working face is 4.66%,and the fitting error of the subsidence basin of 2521 working face is 8.64%.(3)Based on the data results(1)and(2),the surface deformation field distribution model of the whole basin of the working face in the study area is established,which provides a data model for measuring the deformation of any point in the subsidence basin.In order to determine the mining influence range of the working face,the comprehensive deformation field information of the mining area is obtained by fitting the subsidence basin and sbas-insar monitoring results with the measured data and probability integral method.The results show that sbas-insar technology can accurately locate the settlement location,scope and spatial distribution,and the temporal and spatial variation trend is consistent with the actual mining progress.Using the monitoring data of different scales and giving full play to their respective advantages,it makes up for the deficiency of obtaining the large-scale settlement of the mining area by a single monitoring method.(4)The building damage grade evaluation model based on the whole basin topographic deformation field in the mining area is established.In order to scientifically evaluate the mining damage degree of buildings in the mining area,seven buildings with different building structures,construction years and foundation types are selected in different deformation areas in the subsidence basin of the study area.Based on the surface deformation field distribution model of the whole basin established based on achievement(3),the surface deformation(subsidence,inclination,curvature and horizontal deformation)of the area where the seven buildings are located are measured,and the established building damage evaluation model is used,The damage levels of 7buildings are evaluated,and the evaluation results of building damage degree are basically consistent with the damage conditions of buildings in the field survey.There are 35 figures,24 tables and 72 references.