Three-dimensional laser scanning method for surface deformation of similar materials in underground engineering simulation test

Abstract

A surface deformation method for a similar material simulation test in underground work using three-dimensional laser scanning. A five-point mark control point method is used, wherein the five points are used as a point cloud matching benchmark. Once scanning parameters are determined, a three-dimensional laser is used to scan the underground work before and after excavation so as to obtain data of surface point cloud deformation of a similar material simulation test. After processing and modeling, the data is visualized to generate a visual cloud image. The present method solves the problem present when a theodolite and a total station are used to obtain surface deformation information of a similar material simulation test performed in a laboratory, uses a three-dimensional laser scanning technique, and obtains more intuitive and more accurate test results by means of forming data cards and visual processing.

Description

technical field [0001] The invention belongs to the technical field of spatial position deformation of underground engineering, and in particular relates to a three-dimensional laser scanning similar material simulation test surface deformation method of underground engineering. Background technique [0002] The surface deformation of the existing simulation test of similar materials in underground engineering is observed by theodolite or total station, which is a single-point sequential observation. When there are many measurement points, especially when the surface of the test model collapses, falls or separates, it cannot be captured. Real-time information of deformation points, which leads to the inability to obtain a lot of information in actual underground engineering, even if the information obtained is isolated point information. [0003] Therefore, in order to obtain accurate and real-time deformation information of different spatial positions during the implementat...

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Problems solved by technology

[0006] The technical problem to be solved in the present invention is that when the laboratory carries out similar material simulation tests to obtain surface layer deformation information, theodolite and total station are generally used to observe, and there are the following problems: (1) observation is single-point observation, and information between observation points is No, it is considered that the deformation between adjacent points is linear; (2) When the number of observation points is large, it is time-consuming and laborious, requiring people to constantly adjust the instrument, which cannot capture small information changes that appear in a short time; (3) Theodolite and total station instrument limitations and errors caused by human observation, observation errors often fail to meet the test requirements

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