Deformation law of surrounding rock on large mining height fully mechanized mining face of Hanglaiwan Coal Mine
The deformation law of surrounding rock in advance section of mining roadway is of great significance for evalua-ting and optimizing roadway support technology and ensuring normal production of working face.Taking the 30201 large mining height working face of Hanglaiwan Coal Mine as an example,the cross observation method is used to monitor the sur-face displacement variation law of the advanced section of the mining roadway on the 30201 working face.It is found that the rubber belt transportation roadway begins to deform at about 22～38 m on the advanced working face,and the roof and floor and the two sides approach speed increase sharply from 11～15 m,respectively.At the same time,the borehole peeping technology is used to observe the distribution of the loose circle of the surrounding rock in the advance section of the rubber belt transportation roadway.It is found that the surrounding rock of the roadway at 3 m in front of the working face is in the stage of severe mining influence,8 m in front of the working face is in the stage of peak influence of the abutment pressure,and 18 m in front of the working face is in the stage of weakening abutment pressure.Based on the comprehensive analysis of surface displacement deformation law and loose circle test results,the range of mining influential signs in 30201 mining roadway is about 18 m ahead.The research results can provide some reference for the surrounding rock control and support parameter optimization of mining roadway on similar large mining height working face.
large mining height fully mechanized mining facemining roadwaysurrounding rock deformationsurface displacement observationdrilling peep
万方数据
维普
