Surrounding rock multi-parameter monitoring device and preparation method thereof

Abstract

The invention discloses a surrounding rock multi-parameter monitoring device and a preparation method thereof. A monitoring component comprises an expanding cement column, a double-helix metal pipe framework, strain foils and a cable. The double-helix metal pipe framework and the strain foils are positioned in the expanding cement column. The double-helix metal pipe framework comprises two metal pipes and a plurality of connection branch pipes, and the two metal pipes in double-helix arrangement are fixedly connected through the connection branch pipes. The strain foils are fixed to the connection branch pipes, and adjacent strain foils are perpendicular mutually. One end of the cable extends into the expanding cement column, cells of the cable are correspondingly connected with leads of the strain foils, and the other end of the cable penetrates the double-helix metal pipe framework to be led out from the end of the expanding cement column. A range finder is fixed to the end of the cable led out from the expanding cement column. Simultaneous real-time monitoring of stress, deformation, displacement and delamination conditions of surrounding rock at the same position can be realized, and accordingly operating personnel can accurately judge stability of the surrounding rock.

Description

technical field [0001] The invention relates to a monitoring device and a preparation method thereof, in particular to a multi-parameter monitoring device for roadway surrounding rock and a preparation method thereof. Background technique [0002] The vast majority of mines in my country are underground mines. With the popularization of mechanized mining, the number of underground roadways has increased and the development trend of large cross-sections is obvious. With the construction of roads, water conservancy, and civil engineering, the number of tunnels and roadways has increased dramatically. The surrounding rock of the roadway and tunnel is in a complex working environment, which leads to constant changes in the internal stress, deformation, and damage of the surrounding rock, and the stability of the surrounding rock also changes accordingly. However, due to the concealment inside the surrounding rock and the lack and limitation of existing supporting monitoring met...

AI Technical Summary

Problems solved by technology

[0003] At present, the measuring devices for the several physical quantities used as the stability criteria of the surrounding rock—stress, deformation, displacement, and layer separation—are basically mechanical, requiring manual operations and readings, which cannot form an intelligent system for automatic monitoring; the monitoring physical quantity is single , it is impossible to obtain several physical quantities at the same time, and it is impossible to effectively analyze and judge the stability of the surrounding rock

Taking the bolt as the measurement carrier, using strain gauges to measure the stress and strain of the bolt and then calculating the stress and strain of the surrounding rock, due to the limitation of the bolt itself, the number of strain gauges is extremely limited, and it is difficult to measure the full length and high density; In order to measure the carrier, although the fiber grating measurement method can be used for high-density measurement, it is expensive, and the optical fiber is fragile and easily damaged and broken

In addition, the measurement method using the anchor rod as the measurement carrier cannot measure and perceive the delamination damage of the surrounding rock, while the roof delamination instrument can measure the delamination, but the structure is complex, the volume is large, and other physical quantities cannot be monitored at the same time; at the same time, the roof, floor, The determination of the relative displacement of the two gangs is also through mechanical and manual measurement, which makes the measurement inefficient. None of the above methods can accurately monitor multi-parameters in real time

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