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A method and device for determining the support load of the working face under the goaf of a very close coal seam

A very short-distance, goaf technology, applied in the field of determining the support load of the working face under the extremely short-distance coal seam goaf, can solve the lack of theoretical guidance for the analysis and determination of the mechanical effect of the broken roof in the upper coal seam goaf, etc. question

Active Publication Date: 2019-03-19
XIAN UNIV OF SCI & TECH
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Problems solved by technology

[0005] The embodiment of the present invention provides a method and device for determining the support load of the coal seam working face at a very short distance, which is used to solve the problem of failure to analyze the mechanical effect of the broken roof in the goaf of the upper coal seam in the prior art, resulting in the extremely short distance The method of determining the load of the hydraulic support in the coal seam working face lacks the theoretical guidance

Method used

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  • A method and device for determining the support load of the working face under the goaf of a very close coal seam
  • A method and device for determining the support load of the working face under the goaf of a very close coal seam
  • A method and device for determining the support load of the working face under the goaf of a very close coal seam

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specific Embodiment

[0134] (1) Project overview

[0135] Shigetai 12102 Working Face Mining 1 -2 Coal, working face width 294.5m, mining height 2.8m, coal seam inclination 1°-3°, buried depth 60-70m, bedrock thickness 45-60m, loose layer thickness 5-10m. 1 -2上The mining height of the 101 working face is 2.0m, and the distance between the two working faces is 4.0m. The 12102 working face adopts the DBT8824 / 17 / 35 two-column shielding hydraulic support. The technical characteristics of the hydraulic support are shown in Table 1.

[0136] Table 1 Technical characteristics table of 8824 / 17 / 35 two-column shielded hydraulic support

[0137]

[0138] (2) Support load calculation

[0139] According to the mining conditions of extremely close distance coal seams in Shigetai, the parameters are determined as follows:

[0140] m 1 = 2.0m; m 2 = 2.8m; ρ z g = ρ m g=23kN / m 3 ;∑h=4m; L 0 =12m;K p =1.3; h=5m; ρg=26kN / m 3 ;b=1.75m; l k =5m; α=56°; f=4.

[0141] According to formula (1) and formul...

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Abstract

The invention discloses a method and a device for determining the support load of a working face under an extremely short-distance coal seam goaf, and belongs to the technical field of coal mining equipment. To solve the problem of the lack of theoretical guidance in the method of determining the hydraulic support load of the coal seam working face under extremely close distance. Including: divide the roof of the lower coal seam working face under the goaf of the upper coal seam with extremely close distance into masonry beam layer, caving layer and direct top layer; divide the caving layer into free caving area and inclined Column and beam area; determine the support load of the working face through the formula.

Description

technical field [0001] The invention belongs to the technical field of coal mining equipment, and more specifically relates to a method and a device for determining the support load of a working face under a goaf in a very short-distance coal seam. Background technique [0002] Coal seam groups are widely distributed in my country, such as Shendong mining area, Ningdong mining area, Datong mining area, Pingdingshan mining area, Xinwen mining area, Huainan mining area and Guizhou Shuicheng mining area. Since the 1990s, coal seam group mining has gradually entered people's field of vision. There are three main reasons for this: ①The short-distance coal seam is rich in reserves and has broad mining prospects; ②The single coal seam with superior occurrence conditions has been mined, and the problems of coal seam group mining are increasing; ③The current research on coal seam group mining in the mining community Less, the theoretical results need to be enriched. [0003] Coal s...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06F17/50
CPCG06F30/13G06F30/20
Inventor 黄庆享曹健贺雁鹏
Owner XIAN UNIV OF SCI & TECH
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