Coal and rock mass deformation measurement method and device based on strain/displacement conversion

Abstract

The invention relates to a coal and rock mass deformation measurement method and device based on strain / displacement conversion. The coal and rock mass deformation is sensed through a measuring devicefixed to the bottom of a coal and rock mass drill hole and a plurality of movable anchor jaws fixed into the drill hole. A spring or other force / displacement sensors are used for converting coal androck mass deformation into tension changes, then the tension changes are converted into dependent variable changes of a strain module in the measuring device, finally the dependent variable changes are converted into electric signal changes, and the corresponding coal and rock mass deformation is worked out. According to the invention, the displacement is converted into the dependent variable formeasurement, and the adopted sensitive element is the strain gauge, so that the size of the measuring device is greatly reduced, the limitation of a coal mine on the diameter of a drill hole can be met, multi-path measurement can be realized in one set of device, the device cost is reduced, and large-scale popularization is facilitated.

Description

technical field [0001] The invention belongs to the technical field of coal mine safety monitoring, and in particular relates to a method and a device for measuring coal and rock mass deformation during the advancing process of a coal mining face. Background technique [0002] With the continuous improvement of coal mining technology, the mining scale of mines has gradually expanded, and a number of large mining height working faces have emerged in various mining areas. The ever-increasing mining height will lead to an increase in the range of movement and damage of the overlying strata, and the basic top pressure will be more severe, and the phenomenon of large-area and deep coal wall slabs will become more common, which seriously threatens the safety of personnel at the working face. Safety, affecting the normal use and maintenance of working face equipment, reducing the production of working face and economic benefits. Therefore, real-time monitoring of coal wall dynamic...

AI Technical Summary

Problems solved by technology

This invention patent can well measure, store and display the deformation of the coal body in real time during the advancing process of the coal mining face, but it does not specifically limit the principle, measurement method and shape characteristics of the displacement sensor.

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