Underground soft coal seam simulating and copying method and small soft seam pressing device

A layered pressing, coal seam technology, applied in the direction of measuring devices, analysis materials, test sample preparation, etc., to achieve the effect of ensuring accuracy, simple structure, and convenient operation

Active Publication Date: 2018-05-29
XUZHOU HENGAN COAL TECH CO LTD
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

However, if a coal seam that is similar in density, moisture and microstructure to a field soft layer can be simulated and replicated in the laboratory

Method used

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  • Underground soft coal seam simulating and copying method and small soft seam pressing device

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Experimental program
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Embodiment

[0046] For example, in the 3# coal seam of a mine in Yangquan, Shanxi, the measured apparent density of the soft layered coal sample in the original coal seam is 1.36t / m 3 , the raw coal moisture content is 2.7%; the buried depth of the sampling site is 470m, and the average in-situ stress is 11.75MPa. The forming pressure of the coal seam soft layer is measured as 31.78MPa by the method of the above step one. More than 600 kilograms of soft layered coal samples were collected at the site, and sieved with a 6mm sieve in the laboratory to remove coal lumps, and the measured moisture content was only 2.3%. We added about 2.4 liters of water to the coal sample by spraying water, and after stirring evenly, the moisture content of the coal sample was measured to be 2.72%. Store in an airtight bucket for later use. Then press the coal sample with a molding pressure of 31.78MPa according to the method of the above-mentioned step 2, and then maintain a stress of 11.75MPa. Each time...

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Abstract

An underground soft coal seam simulating and copying method comprises the steps as follows: a raw coal sample of an underground soft coal seam is acquired and subjected to moisturizing treatment, andthe apparent density and moisture of the sample are determined in a laboratory; the coal sample of the soft seam is added to a small soft seam pressing device to be pressed under different pressures,and average crustal stress of the coal seam is applied; after the coal sample is taken out, the apparent density of the coal sample in a stress-free state is determined and compared with the actual apparent density of the soft seam, and the forming pressure stress of the soft seam can be obtained; a coal sample of the soft seam is acquired underground and screened to be in the preset size and thenthe moisture of the coal sample is determined; quantitative water is added, stirring is performed, pressurized forming is performed in a large soft seam pressing forming device, and the average crustal stress of the coal seam is applied; vacuum pumping is performed, the coal seam is filled with gas under different pressures, and the simulated and copied coal seam of the soft seam with different outburst hazards is obtained. Favorable conditions are provided for detecting sensitivity of the coal seam to outburst prediction indexes and outburst critical values. The method is simple, convenient,easy to operate, reliable and accurate.

Description

technical field [0001] The invention relates to a method for simulating and duplicating an underground coal seam soft stratification, in particular to a method for duplicating and simulating an actual coal seam soft stratification according to field coal seam measured parameters. Background technique [0002] As we all know, coal and gas outburst is one of the main dynamic disasters in coal mines, and the consequences of outburst are very serious. At present, the mechanism, prediction index and critical value of outburst are constantly being explored, especially no major breakthroughs have been made in the study of mechanism Previously, research on predictive indicators and their critical values ​​was particularly important, requiring a large amount of on-site measured data. However, current laws and regulations do not allow outbursts to occur underground in coal mines. Neither mines nor research institutions can bear the consequences of outbursts. There is no condition to di...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N1/28G01N33/22
CPCG01N1/286G01N33/222G01N33/227
Inventor 张超杰蒋旭唐俊陈裕佳李晓伟杨丁丁李傲胡银鹏蒋承林
Owner XUZHOU HENGAN COAL TECH CO LTD
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