Method for measuring tunnel linear exposed structural surface based on three-dimensional laser scanning technique

Abstract

The invention provides a method for measuring a tunnel linear exposed structural surface based on a three-dimensional laser scanning technique. The method is characterized in that point cloud data of the tunnel wall is collected, latent structural surface lines are determined, the latent structural surface lines at two sides of the tunnel are determined whether the latent structural surface lines belong to the same tunnel linear exposed structural surface, plane equation and normal vector of the plane are determined, and finally the attitude of the tunnel linear exposed structural surface is finally obtained. The method provides a novel thinking way for determining the linear exposed structural surface in tunnel engineering, and carry out the attitude measurement based on the plane definition of the structural surface, and can rapidly, accurately and efficiently obtain the attitude information of the structural surface.

Description

technical field [0001] The invention relates to a method for measuring a linear exposed structural surface of a tunnel based on a three-dimensional laser scanning technology, which belongs to the linear exposed structural surface measurement technology in the field of engineering geological survey. Background technique [0002] Rock mass is composed of structural planes and structural bodies. Due to the existence of structural planes, rock mass has a certain structure, and its structural characteristics are the main controlling factors for rock mass mechanical behavior, deformation and failure forms. Therefore, in geotechnical engineering and engineering geology In other fields, the stability of rock mass is generally evaluated from the structural characteristics of rock mass. At present, the measurement of rock mass structure mainly adopts line survey method and statistical window method, etc. Although these traditional survey methods are currently more commonly used and th...

AI Technical Summary

Problems solved by technology

At present, the measurement of rock mass structure mainly adopts line survey method and statistical window method, etc. Although these traditional survey methods are currently more commonly used and the collected structural surface information is more accurate and comprehensive, traditional survey methods generally have a large workload and short work cycle. Insufficient length and high cost, it is even more difficult to use traditional survey methods in case of high and steep slopes or slopes that are difficult to conduct on-site surveys. Therefore, how to quickly, accurately and efficiently obtain structural surface information has become an urgent problem to be solved

[0003] With the rise of 3D laser scanning technology and the construction of national highways and railways in recent years, many experts and scholars use this technology to quickly collect rock mass structures in tunnel engineering, because 3D laser scanning technology can only obtain point cloud data on the surface of rock mass , it is relatively simple to identify planar exposed structural surfaces. The process of identifying planar structures is described in detail in "A Method for Measuring Structural Surfaces Based on 3D Laser Scanning Technology" (Application No.: 201510025427.1). However, in practical applications The survey found that after the excavation of the tunnel, the structural surface is often affected by the excavation, and the tunnel wall is only exposed in a linear form. It is difficult to find three points that are not collinear to determine the structural surface. Obviously, when this situation occurs, The identification method of 3D laser scanning technology in planar structural surface is no longer applicable, resulting in the bottleneck of 3D laser scanning technology in engineering application

Images