Triaxial multiple coal and gas outburst test device

Abstract

The invention discloses a triaxial multiple coal and gas outburst test device. The device comprises a main pressure chamber, a primary pressure chamber and a secondary pressure chamber, wherein the main pressure chamber comprises a confining pressure chamber base, a steel cylinder, a confining pressure cavity upper cover, an outburst opening sealing taper sleeve, a sealing aluminium sheet, a sealing screw plug, a lifting screw rod, a driving mechanism, a load sensor, a lower bearing plate, a confining pressure piston, a telescopic steel sleeve and a rubber sleeve, wherein the driving mechanism can drive the lifting screw rod to ascend or descend; the primary pressure chamber and the secondary pressure chamber respectively comprise a pressure chamber sleeve, spring lock pins, a piercing tool, an energy storage spring base, energy storage springs, a top cover, a sealing aluminium sheet II and a sealing screw plug II; the primary pressure chamber is installed at the top of the main pressure chamber; and the secondary pressure chamber is installed at the top of the primary pressure chamber. The test device can adopt raw coal in different sizes to carry out coal and gas outburst tests in the triaxial stress state to study the coal and gas outburst occurrence principles more comprehensively and scientifically.

Description

technical field [0001] The invention relates to a coal and gas outburst test device, in particular to a three-axis coal and gas multiple outburst test device. Background technique [0002] Coal and gas outburst is an extremely complex dynamic phenomenon in coal mines, which seriously threatens the safe production of coal mines and affects the production capacity of coal mines. Delayed outburst of coal and gas often occurs in the excavation face, especially in the process of unearthing coal in Shimen. After the first outburst, the sharply inclined coal seams also experienced secondary or even three outbursts. According to incomplete statistics, the number of postponed outbursts in the country accounts for a few percent of the total number of outbursts. Although the proportion is not large, such outbursts are often beyond people's expectations because of "delay". , there is no certain rule, it can be as short as a few minutes, as long as more than ten hours, or even a few da...

AI Technical Summary

Problems solved by technology

According to incomplete statistics, the number of postponed outbursts in the country accounts for a few percent of the total number of outbursts. Although the proportion is not large, such outbursts are often beyond people's expectations because of "delay". , there is no certain rule, it can be as short as a few minutes, as long as more than ten hours, or even a few days; the second outburst often occurs during the cleaning process after the first outburst; Or it is cleaning up after the last outburst, and the personnel cannot retreat in time, which will cause great harm to the miners, cause heavy casualties and property losses, and seriously threaten the safe production of the mine.

The mechanism and form of coal and gas outburst are complex. With the increase of coal mining depth and the increasingly complex mining conditions, the occurrence of coal and gas outburst is also more difficult to predict. At present, scholars at home and abroad have studied the mechanism of coal and gas outburst Research has yielded some results, but most of them are hypotheses from field statistics and laboratory studies

These hypotheses can only explain a certain part of the phenomenon of coal and gas outburst, but cannot constitute a complete quantitative principle system

It is very difficult to predict coal and gas outburst using existing hypotheses, and the accuracy is not high, which brings huge hidden dangers to mine safety production

[0003] At present, the equipment for coal and gas outburst tests mainly has the following problems: (1) Most of the test pieces used are briquettes. Although briquettes are similar to raw coal to a certain extent, there are still large differences between the two. There are certain limitations in the research on the mechanism of coal and gas outburst; (2) Some briquettes are large in size, and the test preparation period is long; (3) The installation of the device is relatively complicated; (4) The device can only generate once Prominent, cannot truly reflect the phenomenon of coal and gas outburst underground; (5) The opening speed of the outburst is slow, which affects the time of coal and gas outburst to a certain extent, and cannot be close to the situation on site

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