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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。
Through the direct shear model test, the characteristics of the expansion through strength of the non-through jointed rock mass under the joint surface morphology are studied. Non-through-jointed rock mass expansion through process is divided into four stages: pre-cracking stage, stable expansion stage, unstable expansion stage and friction stage. Combined with the phenomenon of test and the tangential deformation curve, the characteristics of initial fracture strength, critical strength, through failure strength and residual strength of non-through jointed rock mass are studied. Under the same normal stress, the coarser the joint surface, not only the penetrating failure strength of the non-through-jointed rock mass is larger, but also the initial rupture strength, critical strength and residual strength are larger. The ratio of primary cracking strength to penetration failure strength is about 70% and the ratio of critical strength to penetration failure strength is about 90% for different joint topography. However, the ratio of residual strength to penetration failure strength varies greatly, About 50% to 90%. The experiment provides experimental verification for further research on the failure theory of non-through jointed rock mass.