Method for judging thickness of soft coal seam of tunneling working surface based on gas emission data
A technology for excavating working face and gas gushing, which is applied in the fields of electrical digital data processing, special data processing applications, instruments, etc., can solve the problems of not realizing real-time automatic warning, unable to observe in real time, and heavy workload, so as to eliminate potential safety hazards. , The effect of non-interference in production and improved safety
Active Publication Date: 2019-08-16
HENAN POLYTECHNIC UNIV +1
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[0003] At present, the thickness of soft coal is mainly measured manually after the excavation of the working face, and then judges whether the warning thickness is exceeded according to the manual observation data. Sexuality, real-time automatic warning has not been realized
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[0028] The concept of gas desorption or gas emission is the same, among them, the gas desorption amount is used in the laboratory, and the gas emission amount is used in the field working face.
[0029] A method for judging the thickness of a soft coal seam in an excavation face based on gas emission data, comprising the following steps:
[0030] (1) if figure 1 As shown, make a sketch of the coal seam directly in front of the working face to describe the distribution and thickness of soft and hard coal. The height of the working face is 2.8 meters, and the soft coal seam is located in the middle and the thickness of the soft coal seam is 0.1 meters. 0.5MPa, gas emission Q in the first minute 1 2.75m 3 / min;
[0031] (2) On-site collection of soft coal and hard coal on the cross-section of the working face and brought back to the laboratory. When the gas adsorption pressure is 0.5 MPa and different proportions of soft and hard coal are mixed, the gas desorption amount q in ...
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The invention discloses a method for judging the thickness of a soft coal seam of a tunneling working face based on gas emission data. According to the characteristics that gas is uniformly and slowlydesorbed by hard coal and gas in soft coal is initially desorbed violently and attenuated quickly, based on change conditions of gas desorption amount measured under different soft and hard coal proportions in a laboratory, a first-minute gas desorption amount change rate is obtained, a first-minute gas desorption amount change rate and coal seam hardness ratio correlation model is established, asoft coal seam thickness identification criterion is constructed in combination with gas emission amount data and section hardness coal occurrence conditions obtained through field monitoring, and coal and gas outburst risk early warning is performed according to the soft coal seam thickness. The method is easy to operate and high in accuracy, and compared with a traditional method for manually identifying the thickness of the soft coal seam, the method is faster and safer and has no interference on production.
Description
technical field [0001] The invention belongs to the field of coal mine safety, and in particular relates to a method for judging the thickness of a soft coal seam in an excavation working face based on gas gushing data. Background technique [0002] Coal and gas outburst is a special phenomenon of gas gushing, that is, under the action of pressure, a large amount of broken coal and gas are suddenly ejected from the coal body to the mining space. Coal and gas outburst is a powerful natural disaster in underground coal mines. It seriously threatens the safe production of coal mines and is extremely destructive. an important subject. According to statistics, outbursts mostly occur in places where the thickness of soft coal seams is greater than 0.3m. It can be seen that accurate identification of soft coal thickness and its changes is of great significance for early warning of coal and gas outbursts. [0003] At present, the thickness of soft coal is mainly measured manually ...
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Login to View More IPC IPC(8): G06F17/50
CPCG06F30/20
Inventor 陈向军袁宇陈青康宁宁焦美强冯帅龙
Owner HENAN POLYTECHNIC UNIV