Method for measuring three-dimensional roughness of rock mass structural surface based on triangle area ratio method

Abstract

The invention provides a method for measuring three-dimensional roughness of a rock mass structural surface based on a triangle area ratio method, and belongs to the field of the geotechnique in civil engineering. A digital photogrammetry system is utilized to acquire the structural surface, the three-dimensional space form of the whole structural surface is reflected according to the surface form of the exposed part of the structural surface, plane fitting is conducted on the structural surface through the least square method, the ratio of the total area of triangular meshes of the structural surface to the plane area is calculated and reflects the smooth degree of the fit structural surface. The advantage of a photogrammetry method that three-dimensional data of the structural surface can be quickly and accurately measured is fully utilized, the surface of the structural surface is reconstructed through a Delaunay triangulation method on the basis, and then the surface form of the structural surface is reflected through the three-dimensional triangular meshes. On the basis of reconstructing the surface of the structural surface in a three-dimensional mode, a specific area method is provided, and the magnitude of roughness is reflected according to the ratio of the area of the meshes of the structural surface to the fitting area.

Description

technical field [0001] The invention belongs to the technical field of rock and soil in civil engineering, and in particular relates to a method for measuring the three-dimensional roughness of a rock mass structural surface based on a triangular area ratio method. Background technique [0002] A rock mass is a rock mass structure consisting of rock blocks and structural planes that separate and cut the rock blocks. The structural planes of rock mass have the characteristics of different sizes, different occurrences, and different shapes, so the rock mass presents mechanical properties such as discontinuity, heterogeneity, and anisotropy. A large number of engineering practices can show that during the tunnel excavation process, the geometric and physical characteristics of structural surfaces play a key role in controlling the deformation and failure of rock mass, and have an important impact on the stability of engineering rock mass. [0003] The surface morphology of roc...

AI Technical Summary

Problems solved by technology

[0005] (1) The research on parameter statistics and geometric fractal dimension of roughness is based on the two-dimensional section of the structural surface, which has certain limitations in theory, and the results obtained by different researchers are quite different, which shows that Roughness studies on two-dimensional surfaces cannot truly reflect the roughness coefficient of structural surfaces

[0006] (2) In terms of the evaluation of the roughness of the three-dimensional structural surface, there are few research theories, and the existing research results cannot be applied in engineering

Images