岩石节理粗糙面的分形几何特性与剪切强度关系的实验研究

自然形成的岩石节理面的表面形状具有分形特性，利用分形理论来描述岩石节理的粗糙特性，并确立与岩石节理面的剪切力学特性间的关系对于指导岩体工程设计，和管理具有重要一研究利用开发设计的三维激光测距仪在精确测定岩石节理面的表面形状４ 基础上，依据变量图法建立了 岩石节理面的

THE EXPERIMENTAL RESEARCH ON THE RELATION OF FRACTAL PARAMETERS ON THE ROUGHNESS SURFACES AND SHEAR STRENGTH OF NATURAL ROCK JOINTS

There are the properties of fractals for the naturally developed rock fracture surfaces. It has important significance for guiding the design, construction and management of rock engineering to describe the roughness of rock discontinuous surfaces with fractal geometric theory and to understand the roughness of rock discontinuous surfaces in relation to the shear mechanical properties in loading. Based on the measurement of the fracture surfaces with three dimensional laser scanning instrument, the new fractal geometry model of rough fracture surfaces of rocks are developed and analyzed according to the variogram method. Trie geometric properties of rock fracture surfaces (the basic slope and high grading waviness) can be described quantitatively by the two fractal parameters (amplitude B and fractal dimension D) of the model separately. On the basis of this, the conception and calculated method of average roughness angle U(h) is put forward which represents the roughness property of rock discon-linuouns surfaces. The shear tests on rock discontinuous surfaces show a combined effect of the fractal parameters (average roughness angle U(h)) on the shear mechnical properties. The quantitative relation of shear strength and the fractal parameters (or average roughness angle U(h)) has been obtained based on the shear tests by using the new fractal model. Furthermore, the shear strength rock discon-imuous surfaces is predicted. The results show that the predicted values is in consonance with the tested values.