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Study on failure process and seepage evolution of single fractured rock

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Document pages: 9 pages

Abstract: In order to evaluate the mechanical properties and permeability evolution of fractured rock mass, the failure evolution test of single fractured rock mass is designed by using RFPA software. The test objects are (I) rock mass with different dip angles under uniaxial compression and (II) rock mass with different confining pressure and pore pressure under triaxial compression. The results show that: (1) the crack angle has a significant impact on the crack propagation mode and a small impact on the rock bearing capacity. In the process of crack propagation, the permeability peak is delayed at the stress peak. The stress-strain curve shows different behavior in the post critical part of the curve, especially in the case of 45 °, in which a smooth post critical curve can be clearly observed rather than a sudden decrease in stress in the other two cases (2) When the confining pressure is constant, the trend is almost the same when varying pore pressures, and with the increase in pore pressure, crack propagation is accelerated. At a low confining pressure, the crack is extended vertically to the upper and lower ends of the specimen, forming a longitudinal macroscopic crack. At a high confining pressure, the crack gradually extends to the left and right boundaries of the specimen, forming a transverse macroscopic crack. (3) The rate of crack initiation and destruction first decreases and then increases with the increase in confining pressure when pore pressure is constant.

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