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Coal body permeability characteristic testing system and method

A technology of permeability characteristics and testing system, applied in the field of coal permeability testing system, can solve problems such as uncontrollable confining pressure, change of seepage characteristics, and confining pressure factors provided by engineers and technicians

Inactive Publication Date: 2014-07-23
XIAN UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] At present, the technology for testing the liquid permeability characteristics of coal and rock mass using the steady-state method and the transient method is relatively mature, but the technology for testing the gas permeability characteristics of coal-rock mass using the steady-state method and the transient method is still in the research and development stage. There are the following defects and deficiencies: (1) Although the triaxial seepage test of gas can be realized, the confining pressure in the triaxial seepage test cannot be controlled, and the data of confining pressure factors cannot be provided for engineers and technicians, so engineers and technicians also It is impossible to study the influence of confining pressure on the gas permeability test of coal and rock mass; but at different depths of the mine, the confining pressure of coal and rock mass is different, and the gas permeability of coal and rock mass will also be different due to the different confining pressure. (2) In the uniaxial seepage test and triaxial seepage test of gas, the influence of disturbance factors was not considered, but the coal rock mass under the mine is often affected by different degrees of disturbance due to factors such as tunneling and coal mining. , and then the evolution and distribution of the internal cracks in the coal-rock mass change, which leads to changes in the seepage characteristics of the coal-rock mass, thereby changing the laws of gas gushing out of the coal-rock mass, so the study of disturbance factors is of great importance to the permeability characteristics of the coal-rock mass practical significance

Method used

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  • Coal body permeability characteristic testing system and method

Examples

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Embodiment 1

[0094] Such as figure 1 and image 3 As shown, a coal permeability characteristic testing system of the present invention includes an electronic universal testing machine 40, a permeability characteristic testing device 41, a vibration detection device 50, a first gas system, a confining pressure hydraulic system and a computer 42. The characteristic testing device 41 is centrally placed on the base of the electronic universal testing machine 40, and the electronic universal testing machine 40 is connected with the computer 42;

[0095] The permeability characteristic testing device 41 is composed of a roadside simulation mechanism and a roadside surrounding environment simulation mechanism. The roadside simulation mechanism includes a baffle plate 1, a ventilating plate 2, a coal rock sample 3 and a U-shaped ferrule 4 which are butted in sequence, The baffle plate 1, the vent plate 2, the coal rock sample 3 and the U-shaped ferrule 4 are wound and fixed as a whole by electri...

Embodiment 2

[0126] Such as figure 2 As shown, the difference between this embodiment and Embodiment 1 is that the present invention also includes a second methane gas system, the second methane gas system includes a second methane gas tank 38, and the gas outlet of the second methane gas tank 38 It is connected to the vent pipe 34 through a third gas transmission pipeline 47 , and the third gas transmission pipeline 47 is provided with a second pressure reducing valve 48 and a second air pressure gauge 49 . Specifically, the third gas transmission pipeline 47 is connected to the vent pipe 34 through a third quick connector. All the other structures are the same as in Example 1.

[0127] The method for testing the permeability characteristics of a coal body under the influence of a disturbance by using a coal permeability characteristic testing system in this embodiment includes the following steps:

[0128] Step 1. Assembling the test system for coal permeability characteristics, the s...

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Abstract

The invention discloses a coal body permeability characteristic testing system. The coal body permeability characteristic testing system comprises an electronic universal testing machine, a permeability characteristic testing device, a vibration detecting device, a first gas system, a confining pressure hydraulic system and a computer, wherein the permeability characteristic testing device consists of a lane simulating mechanism and a lane ambient environment simulating mechanism; the lane simulating mechanism comprises a baffle, a breathable plate, a coal rock sample and a U-shaped clamping sleeve; the lane ambient environment simulating mechanism comprises a base, a cylinder tube, a lower pressing head, an upper half concave surface pressing head, an upper half convex surface pressing head and a piston; the first gas system comprises a first gas tank, a first pressure reduction valve and a first gas pressure meter; the confining pressure hydraulic system comprises a confining pressure liquid tank, a hydraulic pump, a unidirectional valve, a confining pressure hydraulic meter and a confining pressure liquid overflow valve. The invention also provides a coal body permeability characteristic testing method. According to the coal body permeability characteristic testing system and method, the axial pressure, the confining pressure and the methane gas pressure are controllable, the gas permeability characteristics influenced by disturbance of a lane coal rock body and a coal mine deep part coal rock body can be tested, and the testing precision is high.

Description

technical field [0001] The invention belongs to the technical field of research on permeability characteristics of coal rock mass, and in particular relates to a coal mass permeability characteristic testing system and method. Background technique [0002] The permeability characteristics of coal and rock mass are the basis for the study of coal and gas outburst and water inrush in mines during underground mining, so it is of great engineering significance to study the permeability characteristics of coal and rock mass. Scholars at home and abroad mostly conduct research on the permeability characteristics of coal and rock mass through laboratory tests. The tests can be divided into two categories: the first is to test the liquid permeability characteristics of coal and rock mass by means of liquid infiltration flow measurement; The first type is to test the gas permeability characteristics of coal and rock mass by measuring the flow rate of gas infiltration. The test method...

Claims

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Application Information

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IPC IPC(8): G01N15/08
Inventor 张天军任金虎李树刚于胜红赵佩佩宋爽李伟成小雨崔巍张磊
Owner XIAN UNIV OF SCI & TECH
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