岩体不连续面的几何特性与剪切强度的关系

利用新开发设计的三维非接触式激光表面形状测定仪，在精确测定岩体不连续面的表面形状的基础上，建立了新的岩体不连续面的分形几何模型，模型中的两个分形参数定量表述了岩体不连续表面形状的几何特性（一级倾斜度和高级次起伏度），并进一步提出了由这两个分形参数组合出的代表岩体不连续面表面粗糙特性的平均粗糙角Ｕ的概念和计算方法。最后，结合岩体不连续的剪切强度实验，建立了剪切强度与分形参数有及平均粗糙角Ｕ间的定量关

Relation of Surfaces Roughness and Shear Strength of Rock Joints

In the study, based on the measurement of the forture surfaces with the newly developed three dimensional laser scarining instminent, a new fractal geomeny medel of rough fracture sudsces of rocks is developed and analyzed according to ti1e vdriogram method. The two geometric propenies of rock fracture sudries (the basic slope and high grading wnviness) cai1 be descrihed quantitatively by the two fractal parameters (amplitude B and fractal dimension D)of the model, respectively. Furthermore, the concephon and calculahonal method of avmp roughness angle U(h) are put forward which represent the roughness properly of rock discontinuous surfaces. The shear tests on mek discontinuous surfaces show a combined effect of the fractal paramters (avemp roughness angle U(h) ) on the shear mechnical properties. The quantitative relation of the shear strength and the fractal pmters (or aveop roughness angle U(h)) is obtained based on the shear tests by using the new fractal medel.