Coal rock three-shaft loading slow pyroelectric detection experiment device and experiment method thereof

Abstract

The invention discloses a coal rock three-shaft loading slow pyroelectric detection experiment device and an experiment method of the coal rock three-shaft loading slow pyroelectric detection experiment device, and belongs to the technical field of coal rock loading charge signal detection. The coal rock three-shaft loading slow pyroelectric detection experiment device and the experiment method of the coal rock three-shaft loading slow pyroelectric detection experiment device can analyze the charge signal variation rules under a coal rock thermal-mechanical coupling effect in a quantitative mode, and have great significance for studying influence on coal rock charge signals from a coal rock slow pyroelectric effect and temperature. The coal rock three-shaft loading slow pyroelectric detection experiment device comprises a coal rock experiment mechanism, a loading system, a heating system, a left charge monitoring system and a right charge monitoring system, wherein the loading system comprises a confining pressure system and an axial pressure system. The experiment method of the coal rock three-shaft loading slow pyroelectric detection experiment device comprises the following steps that firstly, background signals are tested; secondary, the experiment begins, and a coal rock compression fracture charge detection experiment under the condition of a constant temperature or a coal rock slow pyroelectric detection experiment under the condition of a constant load is carried out; thirdly, the coal rock damage mode is observed and recorded.

Description

technical field [0001] The invention belongs to the technical field of coal-rock loading charge signal detection, in particular to an experimental device and an experimental method for coal-rock triaxial loading slow pyroelectric detection. Background technique [0002] my country's coal mining has entered the stage of deep mining. With the increase of mining depth, the geological environment has become more complex, and the stress and temperature have increased significantly. When the buried depth of the mine increases by about 30m, the underground temperature rises by 1°C. According to incomplete statistics, there are more than 50 mines with a depth of more than 1,000 meters in my country at this stage, and the underground temperature of some mines even exceeds 50°C. Among the factors, the influence of downhole temperature has been paid more and more attention. With the development of the mine to the deep mining trend, the research on the physical information detection of c...

AI Technical Summary

Problems solved by technology

However, in the past, stress factors were mostly considered in the thermal fracture analysis of coal and rock, and there was a lack of physical information monitoring.

In addition, the electrical properties of coal rocks change under the action of temperature, and the accumulation, migration, and release of free charges inside coal rocks become complicated.

[0004] At present, there is no experimental device that can detect the change law of the charge signal during the slow pyroelectric release process of coal rock. The charge generated by slow pyroelectric release of coal rock is a weak charge. and extract useful information

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