关键词: 大采高, 超前支护, 锚索支护, 主运巷, 矿压显现

Abstract: In this paper, the research method of combining theoretical analysis and field measurement is used to study the active advanced support technology with anchor rope and field application in the advanced section of the main haulage roadway of 12403 large mining height working face in Shangwan Coal Mine.Based on the active advanced support technology of anchor cable, the support mechanical model of main haulage roadway in fully mechanized mining face is established. The influence range of advanced support pressure and the support strength of bolt ( cable ) and surrounding rock in main haulage roadway under the condition of 8.8 m large mining height are checked.This study provides theoretical support for solving the problem of advanced support such as strong dynamic pressure and large deformation.The following conclusions are obtained by pressure monitoring:In the initial stage, the pressure of the anchor rod in the main transport roadway is basically maintained between 40 ~ 50 kN, and the pressure of the anchor cable is basically maintained between 50~60 kN. Starting from the position 45 m away from the working face, the force of the anchor rod and the anchor cable begins to increase slowly, but the growth rate is small ; from the position of 20 m away from the working face, the stress of anchor rod and anchor cable increases greatly.The stress of bolt and anchor cable tends to be stable after the cumulative increase of 15~25 kN. The average influence range is about 42 m, and the average stress concentration factor is 1.4.The deformation of surrounding rock began to appear when the measuring point was within 45 m from the working face, but the early deformation was small.With the continuous advancement of the working face, the deformation of the surrounding rock gradually increases.When the distance between the station and the coal wall is less than 30 m, the deformation growth rate is larger, 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 of the main transport roadway is low, and the integrity of surrounding rock and coal seam is good. The advance support method of anchor cable has a good support effect on the surrounding rock of the roof.