Study on the Influence of the Roadway Spatial Position in the Jinchuan No.3 Mining Area on the Loose Circle Size of the Surrounding Rock
The loose circle size of surrounding rocks in Jinchuan No.3 mining area is not clear,which causes great trouble to the design of supporting parameters.In view of this problem,by means of on-site testing and numerical simulation,the loose circle size of 1330 m level and 1438 m level roadways in Jinchuan No.3 mining area under different spatial positions was studied.The influences of horizontal arrangement direction and buried depth of roadway on the loose circle size of roadway surrounding rock in Jinchuan No.3 mining area were revealed.The results show that the larger the horizontal arrangement direction of the roadway,the larger the surrounding rock loose circle.The amplification degree of the surrounding rock loose circle in the range of 30°-60° is greater than that of 0°-30° and 60°-90°.The increase of loose circle of roof and floor is higher than that of two sides.The greater the buried depth of the roadway,the greater the loose circle of the surrounding rock.The variation curve of broken area of roadway surrounding rock with buried depth is approximately linear when the buried depth is less than 500 m.When the buried depth is greater than or equal to 500 m,the amplification range of the broken range of the surrounding rock of the roadway increases,and the overall stability of the surrounding rock of the roadway is destroyed.The average error between the on-site testing results and the numerical simulation results of the loose circle size under different horizontal arrangement directions and buried depths of the roadway is 7.5％and 1.0％,respectively.The numerical simulation results are relatively reliable.The research results can provide a reference for the support design of the roadway and the design of the roadway spatial position in the roadway engineering.
Roadway spatial locationDepth of loadwayLoose circle sizeOn-site testingNumerical simulation
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