Coal-rock hydraulic fracturing testing method under true triaxial state

A technology of hydraulic fracturing and test method, applied in the direction of using stable tension/pressure test material strength, suspension and porous material analysis, permeability/surface area analysis, etc. Parametric equations, inability to meet test requirements, etc.

Active Publication Date: 2012-10-17
CHONGQING UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Deep high temperature and a series of problems caused by it have become a difficult problem in deep mining. At present, the research on the influence of temperature in deep mining is still in the initial and qualitative stage. The main problems are as follows: the real stress environment is not considered; In the constitutive equation of the rock rheological model established under the coupling of temperature and pressure, the consideration of temperature as a linear factor needs to be proved and improved when the temperature field distribution and temperature change have not been specifically clarified; The influence of temperature on transformation lacks quantitative analysis, and no specific parameter equation with general significance has been formed. There is no

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  • Coal-rock hydraulic fracturing testing method under true triaxial state
  • Coal-rock hydraulic fracturing testing method under true triaxial state
  • Coal-rock hydraulic fracturing testing method under true triaxial state

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Embodiment Construction

[0100] Below in conjunction with accompanying drawing and embodiment the present invention will be further described:

[0101] 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 on which a frame 2 is fixedly connected.

[0102] The upper part of the frame 2 is provided with the first bushing 3, the top of the frame 2 is fixedly connected with the first end cover 4, and the outer side of the first end cover 4 is fixed with the first oil cylinder 5, the first oil cylinder 5 and the first servo oil circuit 6 connections. A first oil cylinder piston 7 and a first oil cylinder piston rod 8 are integrally arranged in the first oil cylinder 5 , and a first oil cylinder displacement sensor 10 is arranged in the first oil cylinder piston 7 and the first oil cylinder piston rod 8 .

[0103] The lower par...

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Abstract

The invention discloses a coal-rock hydraulic fracturing testing method under a true triaxial state. The coal-rock hydraulic fracturing testing method under the true triaxial state comprises the following steps: 1) preparing a test piece; 2) installing the test piece; 3) pre-loading; 4) loading; 5) hydraulically fracturing; 6) unloading; 7) storing all data recorded by a data collection system, taking out the test piece and observing the shape of the test piece. According to the coal-rock hydraulic fracturing testing method, the real work condition can be more really simulated, and a theoretical basis is provided for solving on-site problems.

Description

technical field [0001] The invention relates to a coal rock hydraulic fracturing test method in a true triaxial state. Background technique [0002] Coal and gas outburst is an extremely complex dynamic phenomenon that occurs underground in coal mines. It can eject a large amount of coal and gas from the coal body to the mining space in a very short period of time, which seriously threatens the safety and security of coal mines in my country. Miners' lives are safe. Therefore, it is very important to strengthen the research on the mechanism of coal and gas outburst. Studies have shown that coal and gas outburst is the process of shear failure of coal body under the cyclical action of internal and external stress, that is, the internal and external stress induced by changes in the ground stress field, coal rock structure, and gas state and flow due to mining activities. Under the action of external forces, when the coal body is partially fractured and damaged to form an outb...

Claims

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Application Information

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IPC IPC(8): G01N3/12G01N15/08
Inventor 尹光志许江王维忠蒋长宝黄滚彭守建张东明程立朝李波波李文璞刘东王倩
Owner CHONGQING UNIV
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