Mechanical mechanism and control technology for floor heave in deep mine soft rock roadway with high stress
In order to control floor heave in deep mine soft rock roadway with high stress in Linxi Mine,the mechanical mechanism and control technology of the floor heave in were studied and analyzed through theoretical analysis and field measurement.The calculation formula of ultimate failure depth,ultimate failure width and effective sliding force along the sliding surface of both sides of the roadway were deduced.It was determined that the floor failure of return airway of 1791-2 working face is extrusion flow floor heave and full section failure heave.The floor heave mechanism,the cause of floor heave and the control way are given.The floor heave control technology with simultaneous controlling of roof,wall and floor was proposed,which used high-strength prestressed anchor bolt net+anchor cable for the roof and two sides of roadway,and the prestressed anchor cable anchoring + concrete bottom laying technology for the floor.According to the industrial test,the floor heave of the roadway was effectively controlled satisfying the requirements of normal mining operation.
deep minehigh stresssoft rock roadwaymechanism of floor heavefloor control
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