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采用颗粒流数值模拟程序,建立不同节理状态的岩石试样模型,对其进行双轴试验模拟,从岩桥长度、节理长度和倾角三个方面对断续节理影响下的岩体破裂形式和力学性质进行了数值模拟分析.岩桥的破裂方式为翼裂纹扩展下的拉剪复合破坏,模型破裂大致经历了翼裂纹的扩展、次生裂纹的延伸以及岩桥的贯通三个过程,而且表现出明显的蠕变特性以及延性破坏.岩桥长度的变化对峰值强度和弹性模量影响较小;相比岩桥长度,节理岩样的力学特性对节理长度更加敏感.对于不同的节理倾角,岩石试件表现出不同的初始破裂形式,0°倾角岩样的破裂方式为翼裂纹的扩展和次生裂纹的延伸,中间岩桥没有被贯通,15°倾角岩样的初裂强度和峰值强度最大.
The particle flow numerical simulation program was used to establish the rock specimen model with different joint states. The rock specimen model was simulated by biaxial test. From the rock bridge length, joint length and inclination angle, the rock mass rupture form and mechanics And the nature of the rock bridge is analyzed.The failure mode of the rock bridge is the composite of tensile and shear damage caused by the expansion of the wing crack.The model rupture generally experiences the three processes of wing crack propagation, secondary crack extension and rock bridge penetration, Obvious creep characteristics and ductile failure.The change of rock bridge length has little effect on the peak strength and elastic modulus.The mechanical properties of the jointed rock samples are more sensitive to the joint length than the rock bridge length.For different jointed angles of inclination, The samples show different initial rupture patterns. The rupture mode of 0 ° dipole is the extension of wing crack and secondary crack, the middle rock bridge is not penetrated, and the initial rupture strength and peak strength of 15 ° dipole are the largest .