A test system and method for coal permeability characteristics

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...

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Problems solved by technology

[0003] At present, the technology of using steady-state method and transient method to test the liquid permeability characteristics of coal and rock mass is relatively mature, but the technology of using steady-state method and transient method to test the gas permeability characteristics of coal and rock mass is still in the research and development stage. There are following defects and deficiencies: (1) although the triaxial seepage test of gas can be realized, the confining pressure in the triaxial seepage test is uncontrollable, 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 affected by the different confining pressure. (2) In the uniaxial seepage test and triaxial seepage test of gas, the influence of disturbance factors is 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 fractures of the coal-rock mass change, resulting in changes in the seepage characteristics of the coal-rock mass, thereby changing the laws of the gas gushing of the coal-rock mass, so the study of disturbance factors is of great importance to the seepage characteristics of the coal-rock mass practical significance

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