Study On Support Technology Of Coal Roadway With Large Section For Roadway Driving Along Next Advancing Coal Face In No.1 Mine Of Pingshuo Underground Mining

In order to relieve the tension of the coal working face replacement,the No.1 mine of Pingshuo underground mining adopts the method of excavating the roadway along next advancing coal face when the previous coal working face is stoped,and forms the " roadway driving along next advancing coal face " of the upper and lower working face under the condition of coal pillar in the interval section.Therefore,the disturbance caused by fully mechanized caving in the previous coal working face has a strong dynamic pressure effect on the excavating roadway itself in the next coal working face,which is very unfavorable to the deformation control of the surrounding rock of the roadway in the next coal working face.Aiming at the influence of mining on the adjacent 19108 working face in the excavating process of 9 coal 19109 auxiliary haulage in No.1 mine of Pingshuo underground mining,the surrounding rock control technology of no.9 coal 19109 auxiliary haulage in No.1 mine of Pingshuo underground mining was studied.On the premise of controlling the stability of 19109 auxiliary haulage,the stability of 19109 auxiliary haulage was reasonably and effectively controlled by combining theoretical research,numerical simulation and industrial test.The following results were obtained:(1)Analysis of the flat back well versed in No.1 mine of Pingshuo underground mining stope roof breaking characteristic,key block B Liang Lixue elastic foundation model is established,and analyze the section under different geological conditions of surrounding rock pillar lateral abutment pressure peak value,the change rule of the section is obtained lateral coal pillar abutment pressure peak mathematical formula,obtained section pillar peak stress theory is 35.43 MPa;(2)Based on the numerical analysis of key block B,it is concluded that the theoretical length of lateral fracture of 19108 working face is about 15.51 m.Based on the empirical formula of working face lateral pressure peak point,it is concluded that the peak point is 18.52 m away from the coal wall of goaf;(3)The stress characteristics of surrounding rocks at three stages of head-on roadway driving are divided,namely,solid coal driving stage,strong mining dynamic pressure influence stage and goaf roadway retention stage.The stress environment of surrounding rocks and roadway deformation characteristics at each stage are analyzed;(4)The stress evolution characteristics of surrounding rock and the scope of plastic failure zone of 19109 auxiliary transportation roadway during the influencing period of tunneling and mining were simulated and analyzed;(5)The supporting parameters of anchor bolt(cable)and the structural dimensions of its auxiliary members were optimized and applied in the field.There are 45 pictures,9 tables and 77 references in this paper.