Method for monitoring earth surface three-dimensional displacement of slope around tunnel entrance by using laser distance measurement instrument

Abstract

The invention relates to a method for monitoring earth surface three-dimensional displacement of a slope around a tunnel entrance by using a laser distance measurement instrument. The method comprises the following steps: (1) selecting four points A, B, C and D which are not located in the same plane out of a slope displacement influence scope for embedding datum points; (2) measuring to obtain three-dimensional coordinates of the datum points A, B, C and D; (3) embedding a monitoring point P, mounting and fixing a reflection sheet at the monitoring point P, and adjusting the angle of the reflection sheet to be vertical to a laser beam of a handheld laser distance measurement instrument; (4) measuring distances from the datum points A, B, C and D to the monitoring point P before excavation deformation, and calculating to obtain an initial three-dimensional coordinate of the monitoring point P; (5) measuring the distances from the datum points A, B, C and D to the monitoring point P after excavation deformation, and calculating to obtain a three-dimensional coordinate of the monitoring point P at each monitoring date; and (6) calculating to obtain earth surface three-dimensional displacement of the monitoring point P at each monitoring date. The method is simple and convenient to operate; the measurement accuracy can be met; the instrument is low in cost.

Description

technical field [0001] The invention relates to a monitoring method for the three-dimensional displacement of the surface of the slope at the entrance of a tunnel, in particular to a measuring method suitable for monitoring the three-dimensional displacement of the surface of the slope at the tunnel entrance with a hand-held laser range finder. Background technique [0002] The stability of slopes is the core issue in slope engineering construction. Unstable slopes may cause serious natural disasters such as landslides and collapses, posing a serious threat to people's lives and property safety. The three-dimensional displacement of the surface is the main evaluation index of slope stability, therefore, the three-dimensional displacement of the slope surface is an item that must be monitored during the slope construction process. The existing three-dimensional displacement monitoring technology of slope surface includes GPS method, total station coordinate measurement method...

AI Technical Summary

Problems solved by technology

However, the accuracy of the GPS receiver is low, and the accuracy of the total station coordinate measurement method is not high. The measurement process is cumbersome, the measurement cost is high, and the professional skills of the monitoring personnel are high. high price

Theodolite intersection method to measure the horizontal displacement of the slope requires the monitoring point and the reference point to be in the same horizontal plane, which is difficult to realize in the actual measurement work; the vertical displacement of the slope measured by the level instrument requires multiple transfer stations to set up instruments, and the actual measurement work intensity is high and The cumulative error is large

[0003] In addition, there are digital close-range photogrammetry technology, three-dimensional laser scanning technology, remote sensing and telemetry technology and other monitoring methods for slope surface displacement, but the accuracy is low, and they are mostly used for early warning and monitoring of long-term stability of large-area slopes, and are rarely used in tunnels. Surface 3D Displacement Monitoring of Uphill Slope at the Entrance

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