Study On The Stability Control Mechanism And Application Of Surrounding Rock In 2401 Belt Roadway Gob-Side Entry In Shunhe Mine

Based on the research background of gob side entry retaining of 2401 belt haulage roadway in Shunhe coal mine,this paper studies the principle and application of gob side entry retaining technology by means of theoretical analysis,numerical simulation and engineering practice,and grasps the stress distribution of surrounding rock,plastic zone distribution and anchor cable stress variation law of gob side entry retaining of2401 belt haulage roadway in Shunhe coal mine(1)Numerical simulation was used to study the working face advancing 20 m and40 m after the top cutting of 2401 belt conveyor roadway m.The stress distribution law,plastic zone distribution law and anchor cable stress change law of roadway surrounding rock at different positions of gob side entry from working face: after roof cutting,the closer to the seam line and roadway roof surface,the distribution range of tensile stress of coal body near seam is greater than that of coal pillar side.The distribution of the plastic zone of the surrounding rock in the lagging working face area is larger than that in the leading working face area.With the increase of the distance between the leading working face and the lagging working face,the plastic zone of the surrounding rock further decreases.The distribution of roof stress is cut off by the cutting seam of roadway roof.With the distance from the working face,the roof stress decreases.The stress of the anchor cable behind the working face and close to the goaf increases sharply compared with the anchor cable in the leading position of the working face.(2)Under the influence of different cutting angles and Cutting Heights,the stress distribution and plastic zone distribution of roadway surrounding rock are studied:under the condition of cutting angle of 90 ° and cutting height of 8500 mm,the plastic zone distribution of roadway surrounding rock is smaller than that of 6000 mm and11000 mm.In the range of lagging working face,the distribution area of plastic zone is the smallest when the cutting height is 8500 mm.No matter in the range of advanced working face or lagging working face,the roof stress of roadway with 8500 mm cutting height is less than 6000 mm and 11000 mm cutting height.Under the condition of 8500 mm cutting height,the distribution of plastic zone and roof stress of roadway surrounding rock with 90 ° cutting angle are less than 75 ° and 80 ° cutting angle in advance working face,while the distribution of plastic zone of roadway surrounding rock with 90 ° cutting angle is greater than 75 ° and 80 ° cutting angle in lag working face,and the roof stress is opposite.(3)The industrial test shows that the deformation of 2401 belt haulage roadway is small and the surrounding rock is stable under the influence of advance abutment pressure.After entering the scope of retaining roadway,the amount of roof subsidence,floor heave and convergence of two sides increase sharply,and the growth rate is large.However,by cutting the roof and retaining the roadway,the deformation of surrounding rock is effectively controlled,and good technical and economic benefits are obtained.There are 70 pictures,5 tables and 82 references in this paper.