Research On Impact Of Coal Mining Subsidence On Surface Building Complexes Based On FLAC3D

China is the world’s number one coal producing country,and also a large country with the majority of coal consumption.While developing and utilizing coal resources,many problems have been exposed,such as the safety issues involved in coal mining.After the mining of coal resources,the original rock stress balance is destroyed,and in order to reach a new state of stress balance,the rock strata and ground surface will move,deform and destroy,which will cause the deformation and destruction of buildings,water bodies,railroads and shafts within the mining area.In order to study the influence of surface subsidence on the neighboring building complexes during coal mining,this paper takes the 1551(1)working face of Pan Yi coal mine and the nearby building complexes as the research object,uses field visits to households and house structure inspection to identify and summarize the deformation and damage characteristics of houses,uses geotechnical engineering survey to identify the hydrogeology and stratigraphy of the study area,and uses FLAC3 D numerical simulation The research tools were used to analyze the surface movement and deformation pattern after coal mining and the impact on the surface building complex.The main conclusions from the comprehensive analysis are as follows1)Through the investigation and structural inspection of 40 houses in the building,the house structure type of the building complex is mainly brick and wood structure,masonry structure and brick and concrete structure,the house damage is mainly tensile cracks,oblique cracks caused by settlement,vertical cracks,horizontal cracks,the damage location mostly occurs in the door and window openings of the house,the middle and four sides of the wall and the intersection of vertical and horizontal walls,some houses have obvious tilt of the wall,including 18 medium damage,accounting for 45% of the total number of households investigated.2)The closest distance between the boundary of 1551(1)working face along the direction of strike and the building complex is 178 meters,6 monitoring points are set around the building complex,through FLAC3 D numerical simulation analysis,the surface subsidence after coal mining has caused surface movement and deformation and has affected the building complex,the maximum sinkage of the mining subsidence basin is 65 cm,the vertical displacement near the mining area located in the northwest direction of the building complex Vertical displacement is 0.0017 m,horizontal displacement in the direction of 0.008 m and horizontal displacement in the direction of0.011 m,while the vertical displacement in the northeast direction of the building complex far from the mining area is-0.015 m,horizontal displacement in the direction of 0.0013 m and horizontal displacement in the direction of 0.0032 m,and the tensile damage of the wall occurs under the action of horizontal displacement and the tilt of part of the wall,and the building group produced horizontal displacement moving toward the direction of the mining area.In summary,the simple structure type of houses in the complex,their own ability to resist deformation is extremely poor,and the coal mining has caused surface settlement and deformation,which is highly correlated with the damage to the houses in the adjacent complex.Figure [29] table [7] reference [77]...