Device and method for measuring gas permeability of coal pillar in similar simulation experiment
A technology similar to simulation experiments and air permeability, which is applied in the field of devices for measuring coal pillar air permeability, and can solve problems such as high price and difficult air tightness
Active Publication Date: 2019-01-15
TAIYUAN UNIV OF TECH
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Problems solved by technology
However, the research object of this patent is the overlying rock stratum, and the device is expensive, and the problem of air tightness is not easy to solve. There are few experimental devices and methods for the study of the air permeability of coal pillars that are crucial in the extraction of old goafs. There are reports
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Embodiment 1
[0038] like Figure 1~3 Shown: A device for measuring the air permeability of coal pillars in a similar simulation experiment, including coal pillar inclusions 6, the structure of coal pillar inclusions 6 is the same as that of the measured coal pillars, the thickness of the coal seam in this experiment is 6 meters, and the similarity ratio is 1 : 100, the size of the simulated coal pillar is length × width × height = 20cm × 20cm × 6cm; the inner surface of the inclusion and the inner coal pillar are closely fitted by the fastening device;
[0039] The coal pillar inclusion 6 is a cuboid structure, and the high-pressure hoses 3 are respectively connected on the two opposite surfaces of the cuboid, one end is the air inlet end, and the other end is the gas outlet end; There is a first valve 4, a pressure gauge 5, a pressure reducing valve 2, and a high-pressure steel cylinder 1; there is gas in the high-pressure steel cylinder 1, which is used to provide the gas required for me...
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The invention discloses a device and a method for measuring gas permeability of a coal pillar in a similarity simulation experiment and belongs to the field of similarity simulation experiments. The device comprises a coal pillar inclusion identical with the coal pillar in structure, wherein the inner surface of the inclusion is closely attached to the inside coal pillar through a fastening device; the coal pillar inclusion adopts a cuboid structure, high-pressure hoses are connected onto two opposite surfaces of the cuboid respectively, one end is a gas inlet end, and the other end is a gas outlet end; the inlet end provides gas required for measurement of the permeability; the gas outlet end communicates with a vacuum pump and the atmosphere. A gas permeability test is applied to the similarity simulation experiment, and particularly, the change rule of the gas permeability when different sizes of old goafs (corresponding to states of the coal pillar under different stresses) are formed through excavation on two sides of the coal pillar in a certain size can be tested; the size of the coal pillar inclusion is changed, and the difference rule of gas permeability of coal pillars in different sizes and in the same stress state can be further researched.
Description
technical field [0001] The invention relates to a similar simulation measurement device and method for seepage of coal and rock mass, in particular to a device and method for measuring the air permeability of a coal pillar in a similar simulation experiment, and belongs to the field of similar simulation experiments. Background technique [0002] Similar material simulation is an experimental method based on the similarity theory, using an enlarged or reduced model to study the mechanical motion and other related characteristics of the corresponding prototype. This method is widely used in fields such as mining, geology, water conservancy and construction. In the field of mining, the method has been widely used in the study of issues such as determination of mine pressure, rock formation failure migration, groundwater infiltration, and slope stability without flowing water. [0003] In underground coal mining activities, due to the continuous change of mine pressure, the st...
Claims
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IPC IPC(8): G01N15/08
CPCG01N15/0826
Inventor 冯国瑞李振高强姜海纳张钰亭戚庭野王泽华王贵文牛利凯康立勋
Owner TAIYUAN UNIV OF TECH