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在节理面剪切试验中,许多剪切应力–位移过程曲线呈现出明显的峰值后区形态。针对这种结构面强度弱化特性,对一组结构面剪切应力–位移过程曲线进行分析,从曲线中获取节理面峰值强度与残余强度。采用一系列应力跌落与塑性流动过程模拟节理面强度弱化过程,通过数值方法再现剪切应力–位移全过程曲线;并进一步研究峰值后区应力–位移曲线与强度弱化的内在关系以及剪胀角演化规律对节理面法向变形的影响,研究成果有助于深化结构面强度与变形特性认识。
In the joint-surface shear test, many shear stress-displacement curves show obvious post-peak morphology. Aiming at the weakening characteristics of the strength of the structural plane, the shear stress-displacement curves of a set of structural planes are analyzed, and the peak intensity and the residual strength of the joints are obtained from the curves. A series of stress drop and plastic flow processes are used to simulate the weakening process of joint surface strength, and the entire process of shear stress-displacement curve is reproduced numerically. The internal relationship between stress-displacement curve and strength reduction and the evolution of dilatancy angle Law on the normal deformation of the joint surface, the research results help deepen the understanding of the strength and deformation characteristics of the structural plane.