Dynamic Inspection Technology of Tunnel Deformation Based on Onboard LIDAR

Abstract

Objective In view of the poor real-time performance, high cost and low efficiency of tunnel deformation monitoring methods in China, it is necessary to effectively improve the efficiency of tunnel deformation monitoring. Hence, a monitoring and measuring method of tunnel deformation based on onboard LIDAR (light laser detection & ranging) is proposed. Method The LIDAR sensor is used to scan and collect the three dimensional data of the whole tunnel section, and the total least squares is used to adjust the cloud data of the tunnel points and fit the surface. The deformation of tunnel section is analyzed according to the fitted ellipse parameters to realize rapid dynamic inspection of the tunnel deformation. Result & Conclusion The experimental results show that with this method the tunnel full section data can be obtained quickly and accurately. The tunnel deformation condition can be effectively obtained through the data processing and analysis with total least squares, basically realizing the dynamic real-time monitoring of the tunnel deformation without affecting the normal traffic in the tunnel.

Keywords

• tunnel deformation monitoring
• onboard lidar
• total least squares
• dynamic inspection