A monitoring method and monitoring system for three-dimensional state change of fractures

Abstract

The invention provides a crack three-dimensional state monitoring method. The method includes the following steps that: (1) a laser range finder at one side of a crack is utilized to measure three vertexes of a triangular light reflection frame arranged at the other side of the crack, so that the distances, vertical angles and horizontal angles from the three vertexes of the triangular light reflection frame to the center of the probe of the laser range finder can be obtained; (2) the step (1) is repeated, data measured in different periods are obtained; (3) the position changes of the three vertexes of the triangular light reflection frame are calculated according to the data measured in the different periods, so that the space coordinate change of the crack can be obtained. The invention also provides a crack three-dimensional state monitoring system. The crack three-dimensional state monitoring system comprises a laser range finder and a triangular light reflection frame; the laser range finder and the triangular light reflection frame are fixed to the ground by monitoring piers; and the three vertexes of the triangular light reflection frame are provided with three total-reflection prisms respectively. The crack three-dimensional state monitoring system and monitoring method of invention have the advantages of structural simplicity, high precision, convenience, easiness in use and high reliability, and are suitable for three-dimensional monitoring of cracks caused by landslides or other geological disasters.

Description

technical field [0001] The invention relates to a monitoring method and a monitoring system for three-dimensional state change of cracks, belonging to the field of monitoring of engineering geological cracks and cracks caused by geological disasters. Background technique [0002] The high-cut slope groups in the Three Gorges Reservoir area are mostly distributed in the densely populated residential areas and along the roads, and have the characteristics of "steep" and "high". For construction activities, it is necessary to take monitoring measures. The change of surface cracks is a key parameter and important characterization for judging the stability of landslides, and its monitoring is indispensable as an important part of landslide monitoring. [0003] The domestic monitoring methods for surface cracks are mainly displacement meters that measure the change of crack width through various schemes, such as: strain gauge-based, fiber grating-based, convergence meter-based, c...

AI Technical Summary

Problems solved by technology

There are many professional instruments for surface crack monitoring abroad, such as the JM series crack meter, PF25 crack meter, REPP remote control crack meter from Canada Roctest company, the vibrating wire crack meter from British SOIL company, and the crack meter and crack meter produced by other companies. Neither the displacement meter, the displacement meter (multi-point) nor the soil displacement meter can realize the three-dimensional surface state monitoring of cracks, or the monitoring accuracy is low and has no reference value.

In addition, there are technologies such as INSAR, 3D laser scanning, GPS, and microfracture imaging to monitor the distribution and development of fractures, but they are too macroscopic to precisely monitor the development process of a single fracture, or they can only reflect the settlement characteristics of ground fissures.

[0004] Due to the many factors causing ground fissures, the deformation process must be complex and three-dimensional, and the single-dimensional monitoring of ground fissure status changes is not enough to reflect its deformation characteristics and genetic mechanism

Images