岩石表面形态的各向异性及其摩擦特性研究

Research on Friction Properties and Anisotropy of Broken Rock Surface

岩体的力学性质取决于岩块的强度、岩块的表面形态和岩块的几何组合结构,通过对砂岩、泥岩破裂面及其互层接触的摩擦试验,分析了不同接触面的剪应力-位移变化规律,提取了摩擦试验中样品的表面形态参数,研究了砂岩、泥岩在摩擦前后破裂面表面形态的变化,分析了它们的粗糙度及其起伏特性在摩擦前后的变化规律,研究了岩石表面形态的各向异性和岩石摩擦强度的关系.结果表明:岩石破裂面的力学行为具有各向异性特征,而这种特征不但取决于破裂面的空间形貌,即破裂面形貌自身的各向异性,而且还和摩擦面相对移动的方向有关.

The mechanics properties of rock mass are decided by the strength, the surface form, and the geometric combination of rock blocks. The friction test between broken surfaces of sandstone and mudstone was performed, shear stress and displacements of different contact surfaces analyzed, and parameters of surface form extracted. In addition, the variation rule of roughness before and after the friction was also analyzed and the relationship between anisotro- py and friction strength of the rock surface researched. The result shows that the mechanics behavior of the broken rock surface is characterized by its anisotropy, which is related not only to the surface form of the rock block but also to the direction of relative movement of the friction surfaces.