Study on Failure Law and Stability Control of Coal Pillar in Coal-rock Combination with Different Dip Angles
Taking a mine in Shendong as the research background,the strength relationship and damage evolution law of coal-rock combination with different dip angles are simulated and studied by theoretical analysis and simulation test.The mechanical properties and failure characteristics of coal-rock combination with different dip angles under uniaxial compression are studied.The influence of different dip angles of coal-rock interface on its overall deformation and failure is analyzed,and the strengthening support technology of bolt-shotcrete bolt in coal pillar of combination is put forward.The results show that with the increase of the inclination angle of the coal-rock combination,the peak strength decreases,and the linear behavior of the stress-strain curve becomes shorter.The boundary of sliding failure of coal-rock combination is 30°-40°;the smaller the dip angle is,the more difficult it is to produce damage during the loading process of the coal-rock combination,and the greater the strain during the damage process is.On the contrary,the larger the dip angle is,the more prone to damage.When the inclination angle is small,the coal-rock combination body is not easy to deform during the stress process,and a large loading force is required to cause damage to the coal-rock combination body.The strengthening support effect of bolt-shotcrete bolt in coal pillar of the proposed combination is significantly greater than that of ordinary support.By analyzing the damage evolution of coal-rock combination,it can provide a criterion for on-site monitoring and the precursor of instability and failure of coal-rock mass.
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