Tunnel back break numerical computation method based on laser point cloud

Abstract

The invention provides a tunnel back break numerical computation method based on laser point cloud. The method comprises the following steps: obtaining the design drawing of a tunnel section profile,and establishing a plane coordinate system; calculating the circle center coordinate, radius and starting coordinate azimuth of each arc segment; obtaining the laser point cloud data of the tunnel section profile, and converting the laser point cloud data into the plane coordinate system; calculating the coordinate azimuth of each laser point cloud datum, obtaining the arc segment where the lasercloud datum is positioned, and calculating the back break numerical value of the laser point cloud datum through a unique expression formula. According to the tunnel back break numerical computation method, the calculation process is simplified, and results can be quickly obtained; the position where the laser cloud datum is positioned and the accurate back break numerical value can be accuratelyobtained, and an effective guarantee is provided for tunnel construction quality.

Description

Background technique [0001] Tunnel deformation monitoring plays an important role in both tunnel construction and operation phases. On the one hand, tunnel deformation monitoring is an important part of tunnel information construction, and it is an important means to feed back the dynamic change trend of surrounding rock and structure, optimize support parameters, and ensure construction safety. On the other hand, tunnel deformation monitoring is also an important part of tunnel health monitoring. It plays an important role in evaluating the safety status of tunnel structures in real time, implementing safety warnings in a timely manner, and maximizing the service life of tunnels. Tunnel over- and under-excavation control is an important part of tunnel construction monitoring and measurement. If over-excavation seriously increases the excavation area, the stability of the tunnel face will decrease, which will easily lead to tunnel instability, while under-excavation will incre...

AI Technical Summary

Problems solved by technology

This measurement method has the following disadvantages: 1) The operation is complicated, time-consuming and laborious, and human factors have a great influence on the measurement accuracy; 2) The environment is complex, there are many adverse factors, and the reliability and sensitivity of the measurement are not high; 3) The measurement point It is difficult to accurately reflect the deformation state of the entire section due to limited

[0003] Li Haibo and others published the article "Tunnel Excavation Lining Quality Inspection Technology and Its Engineering Application Based on 3D Laser Scanning". Then perform logical operations on the two models to obtain the 3D model of the overcut and undercut part, thereby obtaining the overcut and undercut amount. This method cannot obtain the specific value of each point

[0004] Fang Chenglong and others published "Research on Calculation of Over and Under Break Using CAD Secondary Development Program". This article calculates the area of ​​over break and under break, mainly by obtaining the coordinates of the vertices of the triangle through geometric methods, and then calculating the area of ​​over break and under break. Unable to obtain specific points of over-under-mining

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