Analysis On Surrounding Rock Stability Of The Gob-side Entry Retaining Of Yun Jialing Mine

With the exploitation of coal resources and the progress of science,The technology of high water material filling along the side of the empty Lane,as a kind of non coal pillar support technology,is gradually being applied.The implementation of this technology that is a major technological breakthrough Influencing mining of the coal mine safety can not only improve the recovery rate of coal,but also improve the working environment.But the gob roadway as a new technology needs to experience the two mining and roof subsidence during retaining rotary impact resulting in roadway maintenance difficultly especially for the different mine needing to combine the mine geology and production conditions to make different entry Lane scheme.In this paper,the research on the evolution law of the rock pressure in the 12305 working face of the Yunjialing Coal Mine applying the technology of gob-side entry retaining is studied.Theoretical Analysis,Numerical Simulation and Field Measurement are used in the research to Compare and analyse the mine pressure appearance before and after the left lane;to observe and analyse the development and integrity of the roadway roof crack before and after the left lane;to analyse the stability of roadway surrounding rock under the condition of different cutting top height of the side filling body in the lane mainly aimed at the geological and technical conditions of the 12305 transport lane of the Yunjialing Coal Mine and on the basis of systematic study on the law of rock pressure appearance and the stability of surrounding rock.The main conclusions are as follows:Along with the increase of the height of the filling body cut by the side of the left lane along the empty Lane with the roadway left behind.,the lateral support pressure peak under the roadwayis decreased and the partial peak is transferred to the coal roof which is far away from the roadway,which is favorable for the maintenance of the roadway and the success rate of retaining lane.The development information of the roof rock strata in different position of the roof of the roadway was observed and collected by using the borehole imaging device and the collected information is processed and analyzed by the borehole television video image analysis system.Finally,it is concluded that the influence of the strata movement and the two mining on the roof fissure development and integrity of theroadway during the first mining and the remaining lane.(3)The stress of surrounding rock of roadway surrounding rock and the stress of the side filling body during the remaining lane were observed systematically in the Yunjialing Coal Mine.The selection of representative station data is analyzed.And from that Preliminarily judged the influence range of the first mining leading,found the deformation law of surrounding rock in the tunnel and then analysed of the transfer law of the support resistance and the roof stress of the filling body in the filling in the lane.