Study On Deformation And Filling Control Of Surrounding Rock In Cross Abandoned Roadway Mining Of Working Face

Mining across Abandoned Roadway in working faces is a common engineering and technical problem encountered during underground mining in coal mines.The surrounding rock of the Abandoned Roadway is prone to deformation due to stress,and the unstable roof is prone to collapse,forming potential safety hazards,seriously impeding the normal advancement of the working face.In order to reduce the negative impact of empty roadway in the mining process,this thesis focuses on the cross empty roadway filling mining of the working face,using theoretical analysis methods to analyze and explore the stress situation of the surrounding rock of the empty roadway,using numerical simulation and physical similar material simulation methods to simulate and analyze the mining process,and studying the movement and displacement changes of the overlying rock during the cross empty roadway process of the working face,as well as the displacement,stress,and plastic zone changes of the surrounding rock of the empty roadway.Simulate and analyze the effect and advantages of high water filling method across Abandoned Roadway.The main research results are as follows:(1)According to the different occurrence patterns of empty roadways in coal seams or strata,empty roadways are divided into: empty roadways in the same layer of the working face,empty roadways in different layers of the working face,and empty roadways through layers,and further subdivided.Theoretical analysis of surrounding rock deformation in Abandoned Roadway under different compression modes is conducted to obtain the stress forms,failure types,and stress distribution rules of common Abandoned Roadway during the advancing process of the working face.(2)Through numerical simulation,the displacement and stress changes of the overlying strata and surrounding rock of the Abandoned Roadway during the advancing process of the working face are obtained.The variation rules of stress and displacement of surrounding rock in the roadway are obtained when the distance from the roadway is 30 m,25m,15 m,10m,7m,5m,and 3m during the advancing process of the working face.(3)Combining numerical simulation with physical similarity simulation,the stress and displacement changes of the overlying strata when the filling method passes through the empty roadway are obtained,and the stress changes of the surrounding rock of the empty roadway when the working face crosses the vertical empty roadway on the same layer are simulated,as well as the changes in the range of the plastic zone of the empty roadway and coal pillar when the working face is advanced to 20 m,15m,and 10 m from the empty roadway,respectively,The limit relative distance for filling an empty roadway under this test condition is determined to be 15 m.(4)Through monitoring the resistance of the support in the Abandoned Roadway and the changes in the deformation characteristics of the surrounding rock during the advancing process of the working face,it can be seen that the rock pressure during the mining process of the high water filling method across the Abandoned Roadway is in the normal range,the deformation amount of the surrounding rock in the Abandoned Roadway is small,and the effect of controlling the deformation of the surrounding rock in the roadway is good.The thesis has 123 diagrams,13 tables,and 83 references.