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对3种节理连通率条件下的预制非贯通节理岩体试件进行三轴加卸荷试验,对比分析其加卸荷条件下的应力–应变关系曲线特征、破坏形态以及强度特征,同时分析卸荷条件下非贯通节理试件的变形以及强度特征与节理连通率之间的关系。结果表明:(1)非贯通节理岩体加卸荷条件下均表现出各向异性力学特性,且随着节理连通率的增大,这种各向异性特性表现的更为明显;(2)卸荷条件下,试件产生的裂纹更多,破坏程度更高;(3)节理连通率对试件卸荷阶段的变形特性影响显著,变形模量随着连通率的增大而逐渐减小;(4)各节理角度下,非贯通节理岩体卸荷阶段变形模量降幅、卸荷当量峰值强度与连通率k之间的关系可用线性函数表示;(5)随着节理连通率的增大,加载条件下岩体峰值强度逐渐下降,卸荷条件下试件抗剪强度参数黏聚力和内摩擦角均随之逐渐减小。
Three-axis unloading tests were carried out on prefabricated non-through jointed rock mass specimens under three kinds of joint connectivity conditions. The stress-strain curve characteristics, failure modes and strength characteristics under loading and unloading conditions were compared and analyzed. The relationship between deformation and strength characteristics of non-through joint specimens under load and joint connectivity rate. The results show that: (1) anisotropic mechanical behavior of non-through jointed rock mass under unloading and unloading conditions shows that the anisotropic behavior is more obvious with the increase of joint joint rate; (2) Under the unloading condition, the specimens produced more cracks and more damage. (3) The joint connection rate had a significant effect on the deformation characteristics during the unloading stage, and the deformation modulus decreased with the increase of the connection rate ; (4) Under each joint angle, the relationship between the modulus of unloading perforation and the connection rate k can be expressed as a linear function; (5) With the increase of joint connectivity rate The peak strength of rock mass gradually decreases under large and loaded conditions. Both the cohesion and internal friction angle of shear strength parameters of the specimens decrease with the unloading condition.