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为了更好地描述岩体结构面的吻合程度,引入点云数据对齐技术,计算获得岩体结构面三维吻合度参数(JMC3D)。采用三维激光扫描技术,获取岩体结构面上下盘点云数据,基于迭代最近算法(ICP),将结构面参考面和测试面点云数据统一到全局坐标系中并实现对齐,计算对齐后的测试面与参考面之间的Z坐标高差;然后,将高差位于对齐误差区间的点云数据作为吻合部分予以定量化,计算岩体结构面上下盘吻合面积百分比,从而获取三维吻合度参数。最后,根据JRC-JMC模型公式求取岩体结构面剪切强度,与室内岩体结构面直剪试验结果对比分析进行方法验证。4组试验对比结果误差分别为7.38%、3.21%、9.03%、10.02%,表明基于点云数据对齐技术求取的岩体结构面三维吻合度具有一定可行性和实用性,同时也进一步印证岩体结构面三维吻合度与剪切强度之间的相互联系。
In order to better describe the anastomosis degree of rock mass structural plane, point cloud data alignment technique is introduced to calculate the three-dimensional anomaly parameters (JMC3D) of rock mass structural plane. The three-dimensional laser scanning technology is used to obtain the upper and lower disk cloud data of the rock mass structural plane. Based on the iterative nearest-neighbor algorithm (ICP), the reference data of the plane surface and the data of the test surface cloud are unified and aligned in the global coordinate system. Then, the point cloud data with the height difference in the alignment error interval is quantified as the anastomotic part, and the percentage of the anastomosis area on the rock structure surface is calculated to obtain the three-dimensional anomaly parameters. Finally, according to the formula of JRC-JMC model, the shear strength of rock mass structural plane is calculated and verified by comparison with the direct shear test results of rock mass structural plane. The error of the test results of the four groups is 7.38%, 3.21%, 9.03% and 10.02% respectively, which shows that the three-dimensional conformability of the rock mass structural plane based on the point cloud data alignment technology is feasible and practicable. At the same time, The relationship between three-dimensional fitness and shear strength of body structure surface.