基于三维激光扫描仪的岩石破裂面粗糙度研究

Study on Roughness Distribution Characteristics of Rock Fracture Surface Based on 3D Laser Scanner

为更深层地认识岩石的破裂机制。通过压、剪试验测取2组24个圆柱形岩样的破坏载荷,采用高精度三维激光扫描仪扫描岩样破裂面,得到了顶板砂岩在压、剪破坏后,破裂面的起伏粗糙特征分布规律,并采用统计分析方法得到破裂面粗糙曲线曲率半径,从而揭示了砂岩受剪切破坏后粗糙曲线曲率半径分别与粗糙度系数JRC、破坏载荷的相关关系。结果表明:单轴抗压试验中,离加载中心越远,JRC越小;抗剪试验中,粗糙度曲线的曲率半径统计值分别与JRC和抗剪强度呈线性正相关。

For a deeper understanding of the mechanism of rock failure, the failure loads of two groups of 24 cylindrical rock samples were measured by pressure and shear tests. Using a high precision 3D laser scanner to scan the fracture surface of the rock sample, the characteristics of fracture surface roughness distribution are respectively obtained after the compression failure and shear failure. The radius of curvature of cross section curve is obtained using statistical analysis. It reveals the correlation relationship between the curvature radius and roughness coefficient JRC, and the failure load of sandstone, respectively. The results show that the farther away from the load center, the smaller the JRC in uniaxial compression test. The curvature radius of the roughness curve has a linear positive correlation with JRC and the shear strength in the shear test.