Full-process monitoring system for surrounding rock excavation deformation and use method thereof

Abstract

The invention discloses a full-process monitoring system for surrounding rock excavation deformation and a use method thereof, wherein the system and the method belong to the field of geotechnical engineering monitoring. The system mainly comprises a detecting system and wireless positioners. The detecting system transmits a signal to the wireless positioners which are buried at different positions in the surrounding rock, and performs receiving and calculation of feedback signals which are reflected from the wireless positioners for determining the spatial position coordinate of each wirelesspositioner. In use, before a tunnel is excavated, the wireless positioners are mounted at inner preset positions of the surrounding rock through drilling holes. Furthermore the wireless positioners are fixed by an anchoring agent. Afterwards, through multiple monitoring data comparisons before and after excavation, spatial coordinate change of the wireless positioner is calculated, thereby obtaining the spatial displacement of the surrounding rock at the position of the wireless positioner. According to the system and the use method thereof, measurement in a wireless manner is adopted; the monitoring points are arranged in the surrounding rock in advance; and data of inner displacement of the surrounding rock in the full process before and after excavation can be acquired.

Description

technical field [0001] The invention relates to the field of geotechnical engineering monitoring, in particular to a monitoring system for the whole process of surrounding rock excavation deformation and a method for using it. Background technique [0002] With the development of my country's economy and society, more and more tunnels, subways, underground mines, hydropower chambers, etc. The more prominent, such as large deformation of soft rock, stability analysis of surrounding rock, and timing selection of secondary support. Accurately measuring the surface and internal displacement of the surrounding rock and grasping the deformation law of the surrounding rock is an important basis for a good support design and is very important for engineering safety. [0003] In view of the above problems, the existing common treatment method is to use a multi-point displacement meter to monitor the internal displacement of the surrounding rock. For example, the invention patent with...

AI Technical Summary

Problems solved by technology

(1) The elastic deformation of the surrounding rock is completed at the instant of excavation, and the multi-point displacement meter is buried after the excavation is completed, which can only measure the deformation data of the surrounding rock after the excavation is completed, but cannot record the surrounding rock at the instant of excavation Deformation displacement; in many projects there are processes such as blasting and excavation, shotcrete, and metal mesh laying, because the conventional multi-point displacement gauge needs to install an external observation mechanism, and this mechanism should not only avoid damage caused by blasting and shotcrete, but also cannot affect the metal Therefore, the installation of conventional multi-point displacement gauges can only lag further behind the excavation; the above two aspects determine that the data measured by conventional multi-point displacement gauges lack previous data, and are only part of the deformation data of surrounding rock caused by excavation. Not all, there are limitations to the analysis problem

(2) From the above analysis, it is even more impossible to use conventional multi-point displacement meters to measure the displacement of the surrounding rock in front of the tunnel face caused by excavation.

(3) A multi-point displacement meter can only measure the displacement in one direction, and it is difficult to obtain the spatial deformation data of the surrounding rock

Images