Study on the mechanism of blasting roof cutting and pressure relief of roadway protection under deep thick and hard roof
In order to solve the problem of continuous large deformation of deep roadway in Shuangma No.1 Mine under the condition of thick and hard roof,theoretical calculation,FLAC3D numerical simulation,field test and other methods were used to study the effect of roof cutting under different roof cutting parameters,and the contours of vertical stress distribution of roadway surrounding rock after roof cutting was analyzed.According to the results of numerical simulation and field observation,it was determined that the best effect was achieved when the cutting height was 10 m and the cutting angle was 0,which could basically keep the surrounding rock of the roadway in a low stress state,thereby reducing the problem of deformation and instability of the surrounding rock of the roadway under the influence of mining.The integrity of the adjacent working face trough and coal pillar roof was protected through roof cutting and pressure relief technology,providing a certain idea for the treatment of hard roof slabs in mines under the same type of geological conditions.
thick and hard roofnumerical simulationroof cutting and pressure relief
万方数据
维普
