Research on the Behavior Law and Prevention and Control Measures of Mining Pressure of Deep Coal Roadway After Roof Cutting and Reusing
In order to improve the large deformation of the roof and floor of the gob-side entry retaining,the 1462(1)track of Dingji Mine was taken as the research object.Through comprehensive numerical simulation and on-site measurement,the deformation laws of the roadway surrounding rocks were analyzed.The results show that as the distance between the advance working face increases,the vertical displacement of the surrounding rock of the roadway decreases to varying degrees.The deformation of the roadway surrounding rock from 60 m to 120 m ahead of the working face is within 20 cm,and after 60 m ahead of the working face,the impact of mining on the roadway surrounding rock is low and gradually tends to stabilize.After the end of one mining operation,the influence range of advanced support pressure on the working face is about 120 m.A scheme of lateral roof cutting and pressure releasing combined with segmented support was proposed to treat roadway deformation.The numerical simulation results show that this scheme can reduce the vertical displacement of the roadway by 62.5％,verifying its theoretical feasibility.After on-site application,the scheme has achieved good effect,with a 44％increase in the spacing between the roof and floor,which can provide a theoretical reference for the support of similar roadways.
Advance support pressureGob-side entry retainingDeformation law of surrounding rockNumerical simulation
万方数据
维普
