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针对现有裂隙岩石受拉破坏及强度方面研究的不足,利用二维颗粒流软件(PFC2D)构建了裂隙岩石的直接拉伸试验模型,模拟了含单条裂隙和断续双裂隙试样的直接拉伸试验,并分析了裂隙分布特征对抗拉强度和裂纹扩展特征的影响。结果表明,对裂隙岩石试样,裂隙岩石的抗拉强度随裂隙倾角的增大而增大,随裂隙长度的增大而减小,岩桥倾角和岩桥长度对抗拉强度的影响不大,除裂隙倾角α=90°外,试样最终破裂面均与预制裂隙搭接。对断续双裂隙岩石试样,岩桥角度和长度对裂隙之间岩桥贯通影响明显,岩桥倾角和岩桥长度增大时,均出现岩桥未贯通现象。研究结论不仅丰富了断裂力学的内容,而且为工程实践提供了借鉴。
Aiming at the shortcomings of existing fractured rock in terms of tensile failure and strength, a direct tensile test model of fractured rock was established by using two-dimensional particle flow software (PFC2D), and the direct tensile model was simulated with single fracture and intermittent double fracture specimens Tensile test, and analyzes the influence of fracture distribution characteristics on tensile strength and crack propagation characteristics. The results show that the tensile strength of fractured rock increases with the increase of fracture angle and decreases with the increase of fracture length. The influence of rock slope inclination and rock bridge length has little effect on tensile strength, Except for the crack dip angle α = 90 °, the final rupture surface of the specimen is overlapped with the prefabricated fracture. For discontinuous double-cracked rock samples, the effect of rock bridge angle and length on the rock-through of the rockfill is obvious, and the failure of rock-rock bridge occurs when the rock-tilt angle and rock-bridge length increase. The conclusion not only enriches the content of fracture mechanics, but also provides reference for engineering practice.