岩体不连续面双曲线剪切位移曲线的研究

STUDY ON HYPORBOLIC SHEAR DEFORMATION CURVE OF THE DISCONTINUOUS PLANE IN ROCK MASS

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述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（作用在不连续面上的正应力与材料的单轴抗压强度的比值）、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。与此同时，又将该模型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，使得它能较为理想地表现剪切位移曲线，进而使该定量评价方法具有实际的使用价值。

For 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. The relation among the coefficients , the vertical stress ratio (the ratio of the normal stress on the discontinuous plane to the uniaxial compression strength of the material), the undulation angle i and the shear area of the discontinuous plane are analysed. 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 simulated curve can describe the shear deformation curve more ideally, which makes the quantitative evaluation method of practical significance.