Coal sample seepage test method under true triaxial state

A test method, true triaxial technology, applied in the direction of applying stable tension/pressure to test material strength, measuring devices, permeability/surface area analysis, etc., can solve the lack of quantitative analysis, cannot meet the test requirements, and has no formation parameters Equation etc.

CN102735600BInactive Publication Date: 2014-10-29CHONGQING UNIV
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Publication Date
2014-10-29
Estimated Expiration
Not applicable · inactive patent

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Abstract

The invention discloses a method for testing coal sample seepage under a true triaxial state. The method comprises the steps of: 1) preparing a sample; 2) installing the sample; (3) filling oil, evacuating and vacuumizing; (4) loading; (5) absorbing by gas; (6) measuring seepage parameters; (7) stopping an experiment, and (8) storing data. According to the method, a real work condition can be really simulated and a theoretical basis is provided for solving on-site problems.
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Description

Technical field

[0001] The invention relates to a seepage test method of a coal sample in a true triaxial state. Background technique

[0002] Coal and gas outburst is an extremely complex dynamic phenomenon that occurs in coal mines. It can spray a large amount of coal and gas out from the coal body to the mining space in a very short time, which seriously threatens the safe production and production of coal mines in my country. Safety of miners' lives. Therefore, it is very important to strengthen the research of coal and gas outburst mechanism. Studies have shown that coal and gas outburst is a process of shear failure of coal under the cyclic action of internal and external stresses, that is, internal and external stress induced by changes in the geostress field, coal rock structure and gas state and flow caused by mining activities. When the coal body is locally fractured and destroyed under the action of external forces to form a source of outburst, a certain intensity of ...

Examples

Embodiment Construction

[0099] The present invention will be further described below in conjunction with the drawings and embodiments:

[0100] Such as Figure 1 to Figure 19 As shown, a multifunctional true triaxial fluid-solid coupling test system includes a frame 100 and a pressure chamber 200 in which coal and rock samples can be placed. The frame 100 includes a support 1 and a frame 2 is fixedly connected to the support 1.

[0101] The upper part of the frame 2 is provided with a first bushing 3, the top of the frame 2 is fixedly connected with a first end cover 4, the outer side of the first end cover 4 is fixed with a first oil cylinder 5, the first oil cylinder 5 and the first servo oil circuit 6Connect. The first oil cylinder 5 is integrally provided with a first oil cylinder piston 7 and a first oil cylinder piston rod 8, and the first oil cylinder piston 7 and the first oil cylinder piston rod 8 are provided with a first oil cylinder displacement sensor 10.

[0102] The lower part of the frame 2...