Analysis on influence of rock cavity depth on destabilization mechanism of perilous rock
To study the influence of rock cavity depth on the destabilization mechanism of perilous rock mass,four ideal gen-eralized models of perilous rock were prepared by 3D printing technology.The freezing experiment was carried out,and the noncontact,real-time deformation observation was performed for the whole process of perilous rock failure in combination with the digital image correlation(DIC)method.Based on the full-field deformation data calculated by DIC,the relative displace-ment evolution of the main control joint surface and the destabilization failure mechanism of perilous rock were quantitatively analyzed from the fine-view perspective.The results show that the destabilization mechanism of the rock cavity type perilous rock is closely related to the rock cavity depth.When the rock cavity depth is less than the width of perilous rock,the perilous rock exhibits the rotational tensioning failure.When the rock cavity depth is equal to the width of perilous rock,the perilous rock exhibits the tensile and shear failure.In addition,the destabilization time of perilous rock mass is shortened with the in-crease of rock cavity depth.The research results can provide a new idea for quantitatively revealing the destabilization mecha-nism of perilous rock mass.
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