Study On Surrounding Rock Control Technology Of Full Coal Roadway Under Shock Vibration In Yili No.1 Mine

With the exploitation of coal resources,coal resources in the eastern part are becoming less and less.Along with the implementation of the strategy of western development,the exploitation of coal resources in the West has been put on the agenda.In the process of ultra thick coal seam mining,the shock vibration caused by mining and other factors often occurs in the roadway surrounding rock,and the reasonable support of the whole coal roadway under the action of shock and vibration has become a difficult problem in coal mining.The failure mechanism of roadway surrounding rock under impact vibration and impact vibration are studied.Reasonable support for roadway is of great significance for coal mine safety production.Based on the engineering background of Yili coal mine in Xinjiang,this paper studies the shock and vibration phenomena encountered in the 3 coal roadway in Yili No.1 coal mine and the reasonable support of the 3 coal roadway,summarizes the current status and the instability characteristics of the 3 coal roadway,and the impact tendency of the coal mine and the top and floor of the first mine of Yili is measured by the impact tendency experiment,and the weak impact of the coal seam is obtained.The impact property of the roof and floor is not impacted.Through the simulation experiment of the roadway supporting similar material under the action of shock and vibration,the fracture evolution law of the roadway surrounding rock is studied,and the influence factors of the fracture development are grasps.The essential reason for the fracture of the surrounding rock is that the source of the rock is located above the roadway,and when the vibration is spread to the roadway,it reaches the free surface.The reflection wave will produce the tensile stress,which will produce tensile stress in the surrounding rock of the roof of the roadway.When the vibration intensity is high enough,it will produce micro cracks in the surrounding rock of the roadway;it will also produce pressure stress in the position of the two groups and the corner of the roadway,and the fracture of the surrounding rock will be produced when the strength is high.Through the numerical simulation analysis,the variation of the impact and vibration energy of different strength on the roadway surrounding rock is studied,and the related data of the displacement of the plastic zone of the surrounding rock under the impact vibration are studied,and the level of the horizontal stress concentration of the coal and rock around the roadway is gradually increased under the action of the dynamic load,and the two shear failure degree of the roadway is made.The vertical stress concentration area extends to the depth of the model,and the failure degree of the roadway gradually deepens.Through the research and analysis,the paper puts forward the thought of the whole coal roadway under the impact of shock and vibration,and adopts the thought of "four steps",and puts forward that the pressure bolt can control the shock vibration and reinforce it with grouting under the condition of failure,and the rationality of the support mode is verified through the field industrial test.Through the similar material simulation experiment,numerical simulation calculation and field industrial test,it is concluded that the shock vibration is controlled on the basis of pressure bolt support,and after the rock failure is strengthened through grouting,it can better control the deformation of the surrounding rock,ensure the long-term stability of the roadway,and effectively solve the impact of the 3 coal in the first mine in Yili.It is of practical significance to guide the support engineering of roadway surrounding rock under the impact of shock and vibration.