Abstract
Bolts support have become a major active support method in coal mine roadways to control roadway roof failure and improve surrounding rock structure stability. The traditional bolt force status monitoring (BFSM) method has poor anti-interference performance, is easily affected by harsh downhole environments, and cannot support remote real-time monitoring. This paper presents a fiber Bragg grating (FBG) bolt force sensor that monitors the force of roadway bolts. This sensor uses a cantilever and a diaphragm as elastic elements and two FBGs bonded on the top and bottom surfaces of the cantilever as sensing elements. The experimental results indicate that the measuring sensitivity is improved by using the center wavelength difference between the two FBGs. The sensitivity is 38.79 pm/kN within the range from 0 to 150 kN, and the correlation coefficient reaches 99.98%. The engineering applications show that the FBG sensing technology can automatically acquire, and monitoring results are of great significance in roadway anchorage engineering safety and bolt support quality evaluation. Furthermore, such a sensor is also widely used in quasi-distributed measurement and long-term online monitoring of bolt force status in such fields as geotechnical engineering, tunnel engineering, and slope engineering.
Highlights
In recent years, with the improvement of production capacity and the depletion of shallow coal resources, underground coal mining has been extending to deeper and deeper levels, facing high in situ stress conditions [1]
The engineering applications show that the fiber Bragg grating (FBG) sensing technology can automatically acquire, and monitoring results are of great significance in roadway anchorage engineering safety and bolt support quality evaluation
Bolt support is characterized by efficient reinforcement and easy construction and has become the main active support method in coal mine roadways to control roadway roof failure and improve surrounding rock structure stability
Summary
With the improvement of production capacity and the depletion of shallow coal resources, underground coal mining has been extending to deeper and deeper levels, facing high in situ stress conditions [1]. Sci. 2018, 8, 107 and transmission medium can be used to measure physical quantities such as temperature, pressure, displacement, flow rate, and acceleration [5] It has the following unparalleled advantages over the traditional sensing method: intrinsic safety, corrosion resistance, immunity to electromagnetic interference, high reliability, high sensitivity, good stability, strong multiplexing ability, and easy implementation of quasi-distributed long-term online measurement [6]. The monitoring results are of great significance in the parameter design of bolt support in roadways and in anchoring engineering safety Such a sensor is widely used in quasi-distributed measurement and long-term online monitoring of bolt force in such fields as geotechnical engineering, tunnel engineering, and slope engineering
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