Study On The Influence Of Goaf In Huangling Dongfang Coal Mine On The Stability Of Gouxi Village

The coal mine goaf is a concealed,complex,bad construction site with a large surface deformation range and easy to cause geological disasters,which is very harmful to the construction of ground engineering.Disasters such as ground cracks,subsidence,landslides,and collapse caused by uneven surface subsidence,horizontal movement and deformation of the goaf not only affect the safe production and operation of the mining area,but also affect the normal production of residents in the affected area of the goaf.Life activities pose a potential threat.Based on this,the thesis relied on the engineering practice of"Special Evaluation of the Impact of Mining Activities of Dongfang Coal Mine in Huangling County on the Stability of Gouxi Village",and analyzed the physical geography and geography of the study area through data collection,field survey and mapping,engineering survey,and engineering drilling.Environmental and geological conditions,as well as the development characteristics of geological disasters caused by the subsidence of the mined-out areas and the deformation and destruction characteristics of buildings(structures),etc.Through the mining condition discrimination method,it is determined that the site stability of the goaf of Dongfang Coal Mine in Huangling County is basically stable;under the current load of Gouxi Village,the goaf site is basically a suitable construction site and can be used as construction land later;at the same time,According to the final mining time,it is judged that the impact of the goaf subsidence on the stability of Gouxi Village will last for at least 572 days.The probability integral method is used to evaluate the current situation of the mining face(2201,2203)on the stability of Gouxi Village,and the future development trend of the 2202face is predicted and evaluated.The results show that the maximum settlement value when the mining face is completely subsided is 1400mm,which will affect the safety and stability of the houses on the west and south sides of Gouxi Village,and the affected area is about 67567m~2;the future mining of 2202 face will increase the west of Gouxi Village.The houses on the side and the south side are deformed and damaged,and the affected area is about 69463m~2,and the affected area has increased by about 1896m~2.FLAC3D was selected to construct a three-dimensional numerical model of the study area,and the influence of the mined-out subsidence on the stability of Gouxi Village under the current and final working conditions was analyzed.At the same time,the maximum value of surface movement and deformation is smaller than the result of probability integral method,and the influence range is larger than that of probability integral method.The difference between the two calculation methods is mainly due to the simple superposition of the probability integral method for the calculation of multiple working faces,and the influence of terrain factors on the surface movement and deformation cannot be considered.In addition,the mined-out subsidence will cause the potential threat of the overall slippage of the mining slopes of the two valleys on the west side of the village.The research results provide an important basis for the management of surface deformation and damage in the study area and the renovation of village houses or relocation in other places.At the same time,it has important reference significance for the control of ground subsidence and geological environmental protection in other coal mining goafs with similar or identical conditions in Huangling County.