论文部分内容阅读
岩石结构面形貌特征直接影响其宏细观剪切破坏特征和剪切强度,因此清楚地认识在不同点云数据采样间隔下结构面形貌特征和各向异性特征的统计参数稳定性,对于定量认识结构面剪切破坏机制并建立合理的抗剪强度准则十分重要。为此,本文借助三维白光面扫描系统对三组不同粗糙度的岩石结构面进行测量,并根据稀疏点云数据密度的原理得到其15种采样间隔的点云数据;在此基础之上,研究了2D统计参数Z2、Rp和max 2 Dθ/C 1(9)((10))以及其所对应的3D参数Z2s、Rs和max 3 Dθ/C 1(9)((10))随采样间隔的变化规律。研究发现上述统计参数随着采样间隔的增大而减小,且衰减幅度逐渐增大,并与采样间隔存在二次多项式的拟合关系;同时,研究还发现不同采样间隔下结构面的各向异性特征也具有间隔效应。为定量描述这种结构面各向异性特征的采样间隔效应,利用所构造的无量纲参数结构面各向异性系数DAC和各向异性特征的参数K?对其度量,结果表明结构面的各向异性与间隔效应呈现正相关的关系。最后,综合岩石自然结构面分析形貌特征参数和各向异性特征参数的稳定性,在采样间隔取为0.1mm-0.5mm之间表现较好的稳定性(其参数值偏差不大于3%),因此建议一般情况下岩石自然结构面三维扫描的采样间隔可取为0.5mm。
The morphological characteristics of rock face directly affect the macro-scale shear failure characteristics and shear strength. Therefore, it is clear that the stability of statistical parameters of the topography and anisotropy of structural face under different sampling points of cloud data is clear. It is very important to quantitatively understand the shear failure mechanism of structural plane and establish a reasonable shear strength criterion. Therefore, in this paper, three sets of rock facets with different roughness are measured by 3D white light surface scanning system, and point cloud data of 15 sampling intervals are obtained according to the data density of sparse point cloud. Based on this, The 2D statistical parameters Z2, Rp and max 2 Dθ / C 1 (9) (10) and their corresponding 3D parameters Z2s, Rs and max 3 Dθ / C 1 (9) The law of change. It is found that the above statistical parameters decrease with the increase of sampling interval, and the attenuation amplitude increases gradually, and there is a quadratic polynomial fitting relationship with the sampling interval. Meanwhile, the study also found that the different sampling intervals Heterosexual features also have an interval effect. In order to quantitatively describe the sampling interval effect of the anisotropy of structural plane, we use the dimensionless anisotropy coefficient (DAC) and anisotropy parameter K The opposite sex and interval effect showed a positive correlation. Finally, the stability analysis of the morphological and anisotropic parameters of the comprehensive natural rock mass surface shows good stability (the deviation of the parameter values is not more than 3%) when the sampling interval is taken as 0.1mm-0.5mm, Therefore, it is suggested that the sampling interval of three-dimensional scanning of rock’s natural structure plane should be 0.5mm in general.