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对不同节理倾角、不同节理连通率的预制节理圆柱形岩体试样进行单轴压缩试验。结果表明:试样的强度、变形特性及破坏模式与节理构造形态密切相关;在不同节理连通率下,不同角度的非贯通节理试样的力学特性均表现出各向异性特征,随着节理连通率的增大,各向异性特征越来越明显,岩体峰值强度逐渐下降,岩体在弹性阶段的最大弹性模量也逐渐降低;相应地,试件的破坏模式也变得更加复杂,随着节理连通率的增大,应力-应变曲线的斜率逐渐减小,曲线出现多个峰值,且有较明显的屈服平台;非贯通节理岩体峰值强度和弹性模量随节理连通率的非线性变化规律,可分别采用二次和三次多项式函数表示,其系数与节理倾角有关;非贯通节理试样的裂纹变化特征与节理连通率、节理倾角有着密切的联系。
Uniaxial compression tests were carried out on prefabricated jointed cylindrical rock specimens with different joint inclination and joint connection rates. The results show that the strength, deformation characteristics and failure mode of the specimens are closely related to the joint structure. The mechanical properties of the specimens with different angles show anisotropy under different joint connectivity rates. With the joint connectivity The rate of anisotropy is more and more obvious, the peak strength of rock mass is gradually decreased, and the maximum elastic modulus of rock mass is also gradually decreased in the elastic phase. Correspondingly, the failure modes of specimens also become more complicated, with With the increase of joint connectivity rate, the slope of stress-strain curve decreases gradually, and there are many peaks in the curve with more obvious yield platform. The nonlinear strength of peak value and elastic modulus of non-through jointed rock mass with the joint connectivity rate The variation regularities can be expressed by the second and third order polynomial functions, respectively. The coefficients are related to the joint inclination. The variation characteristics of the cracks in the non-through-joint specimens are closely related to the joint connectivity and joint inclination.