规则齿形不连续面的变形特性及其定量评价

Deformation Characteristics of the Discontinuous Plane and Its Quantity Evaluation

以研究不连续面的变形特性为目的，采用双曲线函数作为描迷不连续面剪切位移曲线的本构式，讨论了表征剪切位移曲线形态的关键因素，即：公式中的系数A，B．根据系数A，B的物理意义，分析了它们与垂直应力比、不连续面的起伏角i以及不连续面的剪切面积之间的关系．同时，又将双曲线函数的模拟曲线与试验曲线进行了比较．由于模拟曲线能较为正确地描述初始剪切刚度以及峰值剪应力，使它能较为理想地表现剪切位移曲线，进而使该定量的评价方法具有实际的使用价值．

Just like the shear strength characteristics, the shear deformation characteristics of the discontinuous plane are the most important characteristics in rock mechanics. But the research level of the shear deformation is not so extensive as the shear strength. In this paper, for the purpose of the research on shear deformation characteristics of the discontinuous plane, the hyperbolic function is adopted to describe the shear deformation curve, and the key factors are discussed. These factors are coefficient A and B in the function. Based on the physical meanings of coefficient A and B, the relation among the coeffieients, the vertical stress ratio (the ratio of the normal stress on the discontinuous plane to the uniaxial compression strength of the material), the undulating angle i and the shear area of the discontinuous plane are analsed. Meanwhile, the simulated curves of the hyperbolic function are compared with the test curves. Because the simulated curve can describe the initial shear rigidity and the peak value of the shear stress more exactly, that is to say, the simulted curve can describe the shear deformaion curve un ideally, the quantitative evaluation method is of practical use.