Study On The Deformation Rule Of Roadway Surrounding Rock Under The Condition Of Stubble Mining

In order to extract the influence range of coal seam mining and the deformation rule of roadway displacement under the condition of compressed stubble.In this paper,through theoretical analysis of the coal seam mining stress caused by mining on the roof and floor way of stress and deformation law of surrounding rock,leveling is studied by using similar material simulation experiment,five or six mine pressure crop area caused by coal bed mining strata caving,the stress and displacement variation law,through the numerical simulation software based on five or six mine geological conditions of the simulation to calculate the mining coal seam,different spacing and different pressure of surrounding rock of roadway deformation law of stubble environments,the results show that:?1?According to the theoretical analysis,the stress caused by coal seam mining in roof and floor increases with vertical distance and lose,the next is mainly the effect of vertical stress over a long distance.?2?According to the simulation experiment of similar materials,the rock caving characteristics,stress influence range and displacement changes caused by coal mining under the condition of pressed stubble were obtained.It is concluded that the mining of pente coal seam of no.6 mine has no disturbance effect on the pente coal seam of no.5 mine,and the mining of pente coal seam of no.6 mine causes the caving characteristics and displacement of overlying strata of no.6 mine continue to increase,and the maximum displacement shifts to the rear.?3?Using FLAC^3Dnumerical simulation software,the influence range of coal mining and the failure form of roadway surrounding rocks are obtained.Mining of coal seam e of no.6 mine only has an impact on the surrounding rock change rule of floor roadway within the range of 90m,and the roof deformation of roadway is larger than that of floor deformation.The mining of hexane coal in minmetals mine has a great influence on the surrounding rock change rule of roof roadway.With the increase of vertical distance,the surrounding rock deformation rule of roadway gradually decreases.The deformation of the bottom plate in the vertical distance of 90m is greater than that of the top plate,and the deformation of the top plate outside 90m is greater than that of the bottom plate.?4?The mining of hexi coal seam of minmetals in the stubble area leads to the concentration of stress on the roof and floor and the continuous increase of surrounding rock deformation,which presents the superposition effect.?5?Based on theoretical analysis,similar material simulation experiment and numerical simulation,the vertical stress caused by mining on the overlying working face can be obtained within 90m,while the stress caused by mining on the underlying working face has a large influence on the roadway at 160m.There are 39 figures,5 tables and 75 references in this paper.