Coal pillar stability distributed monitoring system and method

Abstract

The invention relates to a coal pillar stability distributed monitoring system and method. The system comprises a strain data acquisition system used for monitoring coal pillar stress, a data transmission system used for data transmission, a data parsing system used for signal parsing, a data analysis system used for analysis expression and an early warning system used for early warning decision making. According to the invention, a distributed optical fiber sensing device is implanted into a coal pillar; the stress condition of the coal pillar in the recovery process and the stability condition of the coal pillar under influence of mining are sensed; distributed monitoring is carried out in a drilling length range; a real-time result can be formed after data acquisition is completed; thestability of the coal pillar is efficiently and visually analyzed and evaluated, the method can adapt to analysis of internal force characteristics and stability states of different types of underground coal pillars, the interference depth of the protected coal pillar under the mining influence is given, scientific technical guidance is provided for coal pillar reservation parameter optimization,and the problem that coal pillar reservation mainly depends on experience is solved.

Description

technical field [0001] The invention relates to a mining engineering coal pillar stability detection system and method, in particular to a coal pillar stability distributed monitoring system and analysis and evaluation method based on distributed optical fiber testing technology. Background technique [0002] A coal pillar is a piece of coal that remains in a natural state in order to preserve the roadway space or control the settlement of the overlying strata during the mining process of the working face. It is a very important structure in underground mining of coal resources. At the same time, in order to rationally exploit coal resources and protect buildings (structures), water bodies, railways, etc., coal pillar retention is also an essential task. Therefore, it is very important to evaluate the stability and internal force state of the remaining coal pillars for safe production in mines. [0003] At present, the analysis methods of coal pillar stability mainly includ...

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Problems solved by technology

On-site measurement results are the most accurate and direct, but at present the actual measurement uses electronic components such as conventional displacement sensors and pressure sensors as test sensing materials. For example, the reserved coal pillar stability monitoring device disclosed in CN109307534A also uses multi-point displacement sensors and pressure sensors as Test sensing materials. These sensors are often damaged due to factors such as moisture, pressure, water, and dust in actual tests, and there are cases where the test stability is poor.

It can be seen that none of the above methods can comprehensively and accurately detect the mechanical characteristics and stability state of coal pillars.

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