Research and application of advance support technology for main haulage roadway in 8.8 m large mining height working face
Aiming at the strong dynamic pressure and large deformation in advance support section of the main haulage roadway of the 8.8m large mining height working face,theoretical analysis and field measurement were used,to study the active advance support technology with anchor cable for the advance support section of the main haulage roadway of 12403 large mining height working face in Shangwan Coal Mine.The support mechanical model was established,to check the influence range of advance abutment pressure and the support strength of bolt(cable)and surrounding rock in the main haulage roadway under the condition of 8.8 m large mining height.According to the mine pressure monitoring,from the position 45 m away from the working face,the stress of the bolt and cable begins to increase slowly,from 20 m away from the working face,the stress increases greatly,which tends to be stable after the cumulative increase of 15～25 kN,and the average influence range is about 42 m,and the average stress concentration factor is 1.4.The deformation of surrounding rock starts to appear when the measuring point is within 45 m from the working face,but the early deformation was small;with continuous advancement of the working face,the deformation of the surrounding rock gradually increases,when the station is within 30 m from the coal wall,the deformation growth rate rises,but the surrounding rock is stable and the deformation is controllable.The statistical results of borehole peep show that,the overall development degree of surrounding rock cracks in the advance support section is low,and the integrity of surrounding rock and coal seam is good.The advance support method using anchor cable has a favorable support effect on the roof surrounding rock.
large mining heightadvance supportanchor cable supportmain haulage roadwaymine pressure behavior
NETL
NSTL
万方数据
