Research on the Slippage and Instability Mechanism of Roadway Sides and Strengthened Support Technology in Rich Water Soft Rock Stoping Roadways
In view of the difficult problem of controlling the roadway side slippage and instability of the rich water soft rock stoping roadway in the 1205 working face transportation roadway of Yushujing Coal Mine,a research method combining on-site measurement and numerical simulation is adopted to reveal the mechanism of surrounding rock instability induced by the slippage of the roadway side in the water rich soft rock stoping roadway.A strengthened support technology for the roadway side is proposed and on-site experiments are conducted.The results show that the main failure characteristic of the 1205 working face transportation roadway is the failure of the lower part of the roadway side.As the roadway is a semi coal rock roadway,the soft rock expands and squeezes out when it encounters water,damaging the original support structure,causing the rock mass in the lower part of the roadway side to bulge out along the coal rock interface and form an 825 mm wide slope;The main factors affecting the instability and failure of the surrounding rock in the soft rock roadway of Yushujing Coal Mine include the strength of the surrounding rock,the coal rock interface,and the impact of mining;After adopting the strengthened support scheme,the surface deformation amount of the roadway is significantly reduced compares to the original scheme,solving the problems of slippage and instability of the roadway side in soft rock stoping roadway and others.The deformation of the roadway is effectively controlled,ensuring safe and efficient production of the working face.
soft rock roadwayroadway side slippageinstability mechanismstrengthened support
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