Research On The Overburden Movement And Deformation Regular Under The Conditions Of A Complex Mining

Ground surface subsidence caused by underground mining is a serious problem. It can destroy the facilities and buildings on the ground surface, or cause the collapse of the ground surface, bring disastrous. Goaf is caused by underground mining, and form a movement band around it, and this movement band possible have some facilities and buildings on it. If we know the size of the goaf and predict the parameters of ground surface subsidence, it is useful to the dispose of facilities on it, take measures in advance and avoid large security incidents. So in order to achieve safety mining of mine, it is necessary to research on the overlying formation's movement rule caused by underground mining and its effect of the ground surface movement.This paper takes the goaf of Haojiali Colliery underlying Xinzhou-Baode expressway as a test example, minable seams in the coal mine have three main layers, multi-repeated exploitation will aggravate the overlying rock or soil disturbed, and consequently the damage to unstable; another, the mine is in the complex terrain and hilly areas with room and pillar and the long arm hybrid mining exploitation methods, mining methods is diverse. This paper adopting several research methods (such as experiment of analog simulation and numerical simulation), this topic inquiries into some factors (different mining width and mining depth) in detail witch affected the subsidence and deformation of ground surface. Some main achievements obtained as below:(1) In this article, we apply analog simulation experiment to research the law of strata movement and deformation during the exploitation, and the distribution and growing of cranny. Analyzing mining depth and mining width of the effect on the strata,sinking value and the movement and deformation value of ground's surface.(2) Different mining models in a colliery were set up with FLAC 3D software and the figures of displacement field and plastic failure results after stabilization were gotten. Study the range and form of ground's surface movement and deformation in different geology mining conditions. Base on data, surface movement curves of different mining conditions were drawn and analyzed. Thus displacement and lean deformation caused by mining were predicted, study of the law on the movement of overburden seam and deformation of ground's surface.