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为了研究天然岩体结构面粗糙度评价结果影响因素,以重庆武隆地区大尺寸岩体结构面为例,运用三维激光扫描技术,基于Grasselli改进法描述粗糙度在不同采样方向、尺度与精度下的变化规律。结果显示:所选用的天然岩体结构面具有明显的各向异性、正尺寸效应和间距效应,因此在进行粗糙度评价时,采样方向务必与剪切方向保持一致,采样尺寸与采样间距应大于等于和小于等于有效采样尺寸与间距;为便于不同评价方法间结果对比,应保证在相同的采样参数下开展研究。
In order to study the influencing factors on the evaluation results of the roughness of structural plane of natural rock mass, taking the large-scale rock mass structural plane in Wulong, Chongqing as an example, the three-dimensional laser scanning technology was used to describe the roughness under different sampling directions, scales and accuracies based on Grasselli’s improved method The law of change. The results show that the selected natural rock mass structural plane has obvious anisotropy, positive size effect and pitch effect. Therefore, in the evaluation of roughness, the sampling direction must be consistent with the shear direction. The sampling size and sampling spacing should be greater than Equal to and less than or equal to the effective sampling size and spacing; in order to facilitate the comparison between the results of different evaluation methods, should ensure that the same sampling parameters under the study.