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Protective layer selecting method of coal and gas outburst

A technology of gas outburst and protective layer, which is applied in the direction of earth drilling, ground mining, underground mining, etc., can solve the problems of manpower, financial resources waste, lack of geological theoretical basis for protective layer, and lack of theoretical basis, so as to reduce the problem of readjustment, Reduce the effect of blindness problems

Inactive Publication Date: 2015-04-08
CHINA COAL TECH & ENG GRP CHONGQING RES INST CO LTD
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Problems solved by technology

[0002] The selection of the existing coal and gas outburst protective layer is mainly based on the coal and gas outburst hazards in the protective seam coal seam during the actual mining process, as well as the distance from the protected layer, mining sequence, etc. to select the coal and gas outburst protective layer. The selection method of gas outburst protective layer is mainly based on experience and lacks the geological theoretical basis for the selection of protective layer. After years of practical application, this method has played a good role in the prevention and control of coal and gas outburst disasters. However, for some mines, there are no on-site conditions. There is blindness in the selection of coal and gas outburst protective layers, which requires readjustment of coal mining deployment in the actual production process, resulting in a lot of waste of manpower and financial resources. The selection of coal and gas outburst protective layers in the prior art is mainly based on experience and lacks theoretical basis

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  • Protective layer selecting method of coal and gas outburst
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  • Protective layer selecting method of coal and gas outburst

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[0062] S1: The coal measures of the Upper Permian Xuanwei Formation were mined in the minefield. According to the analysis of sedimentology and sequence stratigraphy, the coal measure strata belong to the delta sedimentary system. The coal measure strata are divided into upper, middle and lower coal measures, including More than 30 layers of coal, 11 mineable and partially mineable layers: 1 # 、4 # 、7 # ,8 # 、11 # 、12 # 、13 # , 14-1 # , 14-2 # 、17 # 、28 # , the mine currently mainly mines 1 # 、7 # ,8 # 、11 # coal seam.

[0063] According to the sequence stratigraphy division of coal measure strata in Wangjiazhai Coal Mine in Shuicheng Mining Area, the coal-bearing strata (Xuanwei Formation) of Wangjiazhai Coal Mine can be divided into two sequences according to sequence stratigraphy.

[0064] Sequence I: from the top of the basalt to 11 # Argillaceous sandstone and mudstone at the top of the coal seam. Sequence I has only transgressive systems tract and highsta...

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Abstract

The invention discloses a protective layer selecting method of coal and gas outburst, and aims at solving the problems that protective layer selection of coal and gas outburst mainly relies on experience and lacks theoretical basis. According to the invention, theories including sedimentology and sequence stratigraphy are adopted, and coal measure strata rock stratum property, rock stratum thickness, rock stratum spacing, coal seam thickness and sequence system domain of coal seams are analyzed; under the same geological tectonic conditions, the nearer the coal seams to transgression systems domain largest sea (lake) flooding surface positions, gas storage amount is larger (except limestone top floor coal seams), highlighted tendentiousness of coal seams and gas is larger, so according to the character, coal seam gas occurrence and highlighted tendentiousness of and coal and gas are performed, and theoretical selection of coal and gas outburst protective layer can be performed. The protective layer selecting method of coal and gas outburst perfects selection basis of coal and gas outburst protective layers, solves the problem of blindness of selection of infrastructure mine coals and gas outburst protective layer, and reduces readjustment of coal mining deployment.

Description

technical field [0001] The invention relates to the field of coal mine gas prevention and control, in particular to a method for selecting a coal and gas outburst protective layer. Background technique [0002] The selection of the existing coal and gas outburst protective layer is mainly based on the coal and gas outburst hazards in the protective seam coal seam during the actual mining process, as well as the distance from the protected layer, mining sequence, etc. to select the coal and gas outburst protective layer. The selection method of gas outburst protective layer is mainly based on experience and lacks the geological theoretical basis for the selection of protective layer. After years of practical application, this method has played a good role in the prevention and control of coal and gas outburst disasters. However, for some mines, there are no on-site conditions. The selection of coal and gas outburst protection layer is blind, which makes the coal mining deploy...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21C41/16
Inventor 胡千庭文光才董国伟邹银辉张庆华王麒翔赵旭生崔俊飞覃木广林辉钦唐韩英邹云龙邓敢愽张轶
Owner CHINA COAL TECH & ENG GRP CHONGQING RES INST CO LTD
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