A coal sample water injection device for laboratory simulation of high-pressure water injection in coal mines

Abstract

The invention provides a coal sample water injection device for simulating high-pressure water injection at a coal mine site in a laboratory, wherein a water injection pump is connected with the upper portion of a testing box body, the testing box body is a cylindrical cavity, a shell of the testing box body is in a hollow shape, an oil cavity filled with hydraulic oil is formed in a hollow structure of the shell, the pressure of the hydraulic oil in the oil cavity is controlled by a pressurizer, seven sample sleeves are uniformly arranged in the cavity of the testing box body, loading foam capsules fill the space among the sample sleeves and the space between the sample sleeves and the inner wall of the shell in the cavity, a water seepage disc is arranged at the upper end of each sample sleeve, and a water draining disc is arranged at the bottom of each sample sleeve. The device is novel and unique in structure, simple, reliable, feasible in technology and convenient to process, and by the adoption of the device, the moisture content of samples used in a test is restored to the condition which is the closest to actual condition. The device has an obvious correction function to test results.

Description

technical field [0001] The invention relates to the field of coal sample water injection, in particular to a coal sample water injection device for simulating on-site high-pressure water injection in a laboratory. Background technique [0002] At present, in the experiment, the standard sample of rock or coal is used, and when the water content is studied, the sample must be soaked so that the water content of the standard sample meets the requirements of the test. The current method used is to first To process the standard sample, soak the sample in water for a quarter first, then add water to soak for a quarter after two hours, then add water to soak for three quarters after two hours, add water after another two hours until completely soaked and dry. Soak 20 mm above the specimen for 48 hours. Although this method is widely used, it ignores that in actual engineering conditions, the specimens studied are all under a certain stress state. Therefore, from From this point o...

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Problems solved by technology

[0002] At present, in the experiment, the standard sample of rock or coal is used, and when the water content is studied, the sample must be soaked so that the water content of the standard sample meets the requirements of the test. The current method used is to first To process the standard sample, soak the sample in water for a quarter first, then add water to soak for a quarter after two hours, then add water to soak for three quarters after two hours, add water after another two hours until completely soaked and dry. Soak 20 mm above the specimen for 48 hours. Although this method is widely used, it ignores that in actual engineering conditions, the specimens studied are all under a certain stress state. Therefore, from From this point of view, simply soaking the sample in water and adding water does not meet the actual engineering conditions

[0003] In order to solve the above technical problems, the present invention provides a coal sample water injection device for simulating high-pressure water injection in the field of coal mines in a laboratory. Larger correction, which can simulate the soaking water absorption of the sample under the real stress condition, can effectively solve the problem of large error in the existing soaking method, and can accurately ensure the actual water absorption state of the sample

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