Failure mechanism and control of underground wall rock under the effect of water pressure stress
Based on the actual situation at Caojiatan Coal Mine,that the wall rock of the opening is weakened by water pressure while crossing the stratum,we did deformation,failure and control research on the surrounding rock of the main inclined opening under the hydraulic stress effect by means of data review,field investigation,theoretical analysis,formula calculation and numerical simulation,etc.To employ the equivalent radius method of semi-circular arch opening section,combined with the factors,such as formation water pressure,lateral pressure coefficient,buried depth,cohesion,internal friction angle and roadway size,we designed an optimized mathematical formula of plastic zone distribution in shaft surrounding rock,and made the numerical simulation and the sensitivity analysis of the formula.Aiming at controlling stratum lithology difference and water pressure weakening,the water damage control and surrounding rock control of shaft are carried out from the aspects of prohibiting wall rock shear failure,improving the cohesion and internal friction angle of surrounding rock,opening water discharge and pressure reduction,grouting to replace water source,and strengthening the original supports.It will be a certain reference for the research on the deformation and failure law of surrounding rocks under water pressure stress,on the relevant numerical simulation study,and on openings reinforcement and water disaster prevention and control.
wall rock of shaftwater pressure effectplastic zonefactor analysislaw of destruction
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