Rock formation displacement monitoring device and monitoring method

Abstract

The invention discloses a rock formation displacement monitoring device and relates to the technical field of geotechnical engineering. The rock formation displacement monitoring device includes a coaxial cable Bragg grid strain sensor, a signal demodulator, a wireless transceiver module, a solar power supply module and a protection wall steel pipe. When the coaxial cable Bragg grid strain sensorgenerates tensile strain under external force due to the displacement of a rock formation, the reflection peak frequency of an electromagnetic wave spread in a coaxial cable is shifted, a reflection signal is transmitted to the signal modulator for modulation, force bearing information of the rock formation is sent from the wireless transceiver module to a monitoring center to monitor the force bearing of a target rock formation in real time, and the early warning of rock formation displacement is carried out. The invention discloses the rock formation displacement monitoring device which hasthe advantages of a firm structure and a wide measuring range and can work in extreme environments, the interruption of an electric grid signal in the coaxial cable caused by drilling well blocking caused by rock formation dislocation is avoided, and the monitoring effect is better.

Description

technical field [0001] The invention relates to the technical field of geotechnical engineering, in particular to a rock formation displacement monitoring device based on a coaxial cable Bragg grid strain sensor. Background technique [0002] At present, due to the massive exploitation of underground resources and the construction of underground engineering, rock formation compression and ground subsidence are not uncommon, causing huge economic losses to the society. Disaster prevention and mitigation have become an urgent need for my country's economic and social development. The key to preventing and controlling land subsidence is to accurately grasp the internal deformation and displacement of rock strata and establish a long-term monitoring system for rock strata displacement. [0003] At present, the monitoring device for rock formation displacement mainly adopts fiber grating sensor, which mainly uses SiO 2 The low-loss and well-defined optical characteristics of sin...

AI Technical Summary

Problems solved by technology

However, the fragility of the material used to make the fiber grating sensor results in a small dynamic range of measurement and is easily damaged, and cannot meet the requirements of real-time strain measurement under extreme conditions and environments.

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