Study On The Laws Of Surface Subsidence Induced By Double-seams Mining In Jiafeng Coal Mining

With the rapid development of economy,people are consuming more and more resources,especially the increasing demand for coal resources.However,coal mining has brought great pressure on the environmental problems in the mining area,and the coal mining area has changed the original balance state of the rock and soil.Once it is unstable,it will cause surface subsidence and fissure in the ground,destroy the qualitative features,Therefore,it is very important to study the influence of underground coal mining on surface movement deformation.Based on the study area of Jiafeng coal mine in Shanxi Province,this paper simulates the surface subsidence characteristics and surface deformation results of the mining area of coal seam,and mainly obtains the following research results and contents:(1)In order to fully understand the landform and engineering geological conditions in the Jia Feng mining area,the analysis of the historical and current situation of the excavation of coal seam,The formation conditions and mechanism of the ground collapse in coal seam no.7 & no.9 conditions has been discussed.(2)The numerical simulation method was used to simulated the ground collapse characteristics and surface deformation results of double-coal seams mining.(3)The influence of mining length,mining width and thickness of coal seam on ground collapse was discussed.The least square method is used to fit the numerical expression between the above variables and the maximum collapse value.This formula has certain guiding significance and reference value to the prediction of ground subsidence in other mining areas.