双裂隙组合岩体力学性能与裂纹演化的颗粒流模拟研究OA

To investigate the synergistic mechanism between confining pressure and geometric characteristics of structural planes in rock masses containing double fractures,a biaxial compression simulation test was conducted on combined rock masses with double fractures using the particle flow numerical simulation method.The mechanical properties,crack coalescence patterns,and micro-crack evolution under different confining pressures and rock bridge inclination angles were investigated.The research results indicate that the peak strength,elastic strain energy before the peak,and peak axial strain are all significantly positively correlated with the confining pressure level.The inclination angle of rock bridges is a key factor influencing the failure mode.Under inclination angles of 0°～90°,the failure modes of specimens can be roughly categorized into four types.For the same inclination angle,the failure modes in the rock bridge zone under different confining pressures are generally similar,but the presence of confining pressure significantly affects the form of cracks at the crack tip.The force chain distribution varies among specimens with different rock bridge inclination angles,and confining pressure enhances the concentration of pressure chains while significantly restricting the distribution range of tension chains.