Method for remotely measuring horizontal displacement of roadbed

Abstract

The invention discloses a method for remotely measuring horizontal displacement of a roadbed. The method comprises the steps of selecting two fixed reference positions A and C; arranging a first reflector at a first height D above the to-be-measured roadbed, wherein the first reflector is perpendicular with ground; arranging a second reflector at a reference position C, wherein the included angle between the second reflector and a horizontal surface is theta2; before horizontal displacement of the to-be-measured roadbed occurs, transmitting a first laser beam by a laser range finder at a position A, wherein the included angle between the first laser beam and the ground is theta1, measuring a first distance of the first laser beam from reflection by the first reflector and the second reflector to returning by the laser range finder; after horizontal displacement of the to-be-measured roadbed occurs, transmitting a second laser beam by the laser range finder at the position A, wherein the included angle between the second laser beam and the ground is theta1, measuring a second distance of the second laser beam from reflection by the first reflector and the second reflector and returning by the laser range finder; and computing the horizontal displacement of the to-be-measured roadbed according to the first distance, the second distance and theta1.

Description

technical field [0001] The invention belongs to the technical field of laser measurement, and relates to a device and a method for remotely measuring the horizontal displacement of a roadbed by using a laser. Background technique [0002] Subgrade displacement is unavoidable during road construction and after completion. With the rapid development of track construction in recent years, people pay more and more attention to related safety issues. Especially with the emergence of high-speed railways, there are higher requirements for the control of subgrade deformation. In order to understand the displacement trend of the subgrade under load in time, so as to take effective measures in advance to prevent accidents, it is necessary to set up observations during the road construction process and a period after completion. After the completion of the subgrade displacement observation, the observation time should be determined according to the actual situation. In the method pr...

AI Technical Summary

Problems solved by technology

In the method provided by the article "A New Method for Real-time Measurement of Railway Subsidence Displacement" (Zhang Yanan, 2008), a laser and a target are used, and the target surface is placed at an angle of θ between the surface of the target and the horizontal plane and directly placed on the subgrade to be measured. In this method , when the subgrade to be measured is displaced or shaken, the angle between the target surface and the horizontal plane may change, so that the laser cannot return along the original optical path, resulting in the inability to obtain the distance to be measured by laser ranging

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