Highway high slope surface deformation monitoring and analyzing method based on oblique photogrammetry technology

Abstract

The invention discloses a highway high slope surface deformation monitoring and analyzing method based on an oblique photogrammetry technology. The method comprises the steps that a slope surface three-dimensional geometric scalar field is established based on the oblique photogrammetry technology; a slope surface deformation vector field is established through slope surface three-dimensional geometric scalar fields at different time points; the divergence of the deformation vector field is calculated to determine the area of expansion and collapse deformation of the surface of the slope and the severity of deformation; and texture mapping is carried out on a TIN network of a three-dimensional geometric model through photo images measured through oblique photogrammetry to establish a realscene three-dimensional model, through the model, the number of cracks generated in and around a slope surface deformation area, crack distribution and crack development change conditions can be analyzed, and through the analysis of the slope surface deformation area and the crack distribution and development conditions, the development stage and change trend of slope deformation are analyzed andjudged.

Description

technical field [0001] The invention belongs to the field of geotechnical engineering, and in particular relates to a method for monitoring and analyzing surface deformation of high road slopes based on oblique photogrammetry technology. Background technique [0002] At present, a large number of research results have been obtained for the analysis method of high slope stability. The deformation of the slope surface is the most direct and effective basis for judging the stability of the slope. The deformation evolution of the slope will generally experience the initial deformation, etc. There are four deformation stages: rapid deformation, accelerated deformation, and rapid deformation. The slope surface deformation and crack distribution in each deformation stage have typical characteristics. The use of slope surface deformation analysis is one of the important methods for judging the deformation stage and subsequent development trend of high slopes. one. [0003] At prese...

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Problems solved by technology

[0014] In order to overcome the deficiencies of the above-mentioned slope surface deformation monitoring method, the method of the present invention utilizes oblique photogrammetry technology, and the obtained slope surface point cloud forms the slope surface deformation vector field, and simultaneously performs texture mapping on the TIN network of the three-dimensional geometric model to establish a real scene. 3D model, and then through the divergence analysis of the deformation vector field to determine the areas where expansion and collapse deformation occur on the slope surface, and through the real scene 3D model to analyze the distribution and development of cracks in the deformation area and surrounding areas, so as to realize the deformation of the slope surface monitoring and analysis, and then correlate with the macro-deformation characteristics of each stage in the entire development and evolution process of high slope deformation until traction landslide failure (such as figure 2 shown) to provide a basis for judging slope stability

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