不同节理表面形貌下非贯通节理岩体强度特性直剪试验研究

通过直剪模型试验，研究节理表面形貌下非贯通节理岩体扩展贯通强度特性。非贯通节理岩体的扩展贯通过程分为4个阶段：初裂前阶段、稳定扩展阶段、非稳定扩展阶段和摩擦阶段。结合试验现象和切向变形曲线，研究了非贯通节理岩体的初裂强度、临界强度、贯通破坏强度、残余强度等特性。在相同的法向应力下，节理表面越粗糙，不仅非贯通节理岩体的贯通破坏强度越大，而且初裂强度、临界强度、残余强度也越大。在不同的节理表面形貌下，初裂强度与贯通破坏强度的比值约为70%；临界强度与贯通破坏强度的比值约为90%；不过，残余强度与贯通破坏强度的比值变化较大，约为50%～90%。试验为进一步研究非贯通节理岩体破坏理论提供试验验证。

Research on strength behavior of rock mass containing discontinuous joints by direct shear test under different joint surface morphologies

By direct shear test, strength behavior of rock mass containing discontinuous joints with different joint surface morphologies is researched. The extension process to the rock mass can be divided into 4 stages: before initial cracking stage, crack stable growth stage, unsteady growth stage and friction stage. According to the experimental phenomena and the shear deformation curve, initial cracking strength, critical strength, failure strength and residual strength are researched. With the same normal stress, the joint surface morphology is rougher, not only the failure strength is higher, but also the initial cracking strength, critical strength, and residual strength are higher. With different joint surface morphologies, the ratio of the initial cracking strength and failure strength is about 70%; the ratio of the critical strength and failure strength is about 90%; but the ratio of t initial cracking strength and failure strength is not stable, which is about 50%-90%. The experimental verification is provided to further study failure theory of rock mass containing discontinuous joints.