Study On The Movement Law Of Overlying Strata In Strip Mining In The North Second Mining Area Of Xima Coal Mine

Coal,as an important material energy,is an important guarantee for the economic development of our country,too.For hundreds of years,the development of human society to the formation of coal resources is difficult to change in a short time,however,with the underground coal mining,a series of hazards came.After coal seam mining,the original rock should force balance destroyed,resulting in surface cracks and large area deposition,this is not only pose a harm to the surface buildings(structures),railway and agricultural development,even lead to surface subsidence,soil erosion,water circulation system deterioration,and bring the extremely serious impact to the environment for human survival and social production.Coal mining under village is one of the hot topic in the coal mining industry,Xi Ma coal mining area to the North West Village posts under the pressure of coal is typical of villages under the pressure of coal mining case.In order to effectively and accurately master strip mining overlying strata movement and deformation rules,the similar material simulation experiment and FLAC3D numerical simulation method,to Liaoning lighthouse City Xima coal mining area to the North West Shang Gang Zi Cun under pressure 12 coal seam is a research object study in different depth of mining,mining thickness and left for mining in proportion to their respective mining under the condition of mining overlying strata movement and deformation propagation.The research contents and results are as follows:1?The "three zone" theory of mining overlying strata movement and deformation laws of the system and rules of analysis and research,overlying strata moving following the numerical simulation and experimental study on part deformation of lay a solid theoretical foundation.2?Using FLAC3D numerical simulation software of coal in different mining depth,mining thickness and left for mining than the mining condition of mining overburden movement law of deformation,by using the method of controlling variables and of overlying strata displacement measuring line displacement deformation characteristics and exploitation of different factors between the relation.3?Using Origin data analysis software to analyze the relationship between the vertical displacement and the mining factors,and obtained the maximum vertical displacement and mining depth,mining thickness and the ratio of the surface of the earth.4?Through laboratory simulation experiment of similar materials to study coal seam in different mining and reservation ratio under the condition of mining in mining overlying strata movement and deformation law,simulating coal seam mining well maintained overlying rock"three zones" formation and deformation propagation rules.Through arrangement of displacement measuring points,mining overlying strata in different mining leaving the proportion of mining conditions,the displacement measurement line of vertical displacement and horizontal displacement curve deformation.The results of the study is verify the numerical simulation results.The results of the experiment are ideal,hoping to bring some scientific guiding significance to the safe production of the mining area.