Hard roof working face strata pressure behavior classification method

A technology of hard roof and grading method, which is applied in mining equipment, mining equipment, earth square drilling and mining, etc., and can solve the problems of poor applicability and single consideration factors

Active Publication Date: 2016-11-16
LIAONING TECHNICAL UNIVERSITY
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Problems solved by technology

At present, the mine pressure appearance classification methods of hard roof working faces are basically combined with direct roofing and basic roofing. The considerations are single and the applicability is not strong. A scientific and reasonable mine pressure appearance classification method is needed to guide the safety of hard roof working faces. Production

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  • Hard roof working face strata pressure behavior classification method
  • Hard roof working face strata pressure behavior classification method
  • Hard roof working face strata pressure behavior classification method

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Embodiment Construction

[0030] The specific implementation manners of the present invention will be described in detail below in conjunction with the accompanying drawings.

[0031] A method for grading mine pressure manifestations in working faces with hard roofs, such as figure 1 shown, including:

[0032] Step 1. Determine the judging factor set U=(u 1 , u 2 , u 3 , u 4 , u 5 , u 6 , u 7 ), to obtain the value of each evaluation factor;

[0033] According to the degree of difficulty of the roof collapse, the cushioning effect of the direct roof, the size of the mining space and other factors, the determination of the evaluation factors includes: the initial pressure step distance u 1 , basic top thickness u 2 , mining thick u 3 , Ratio u of mining thickness to immediate roof thickness 4 , The proportion of hard rock formations within 100m of the coal seam roof u 5 , buried depth u 6 , working face length u 7 . At the same time, according to the geological survey, exploration results...

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Abstract

The invention provides a hard roof working face strata pressure behavior classification method. The hard roof working face strata pressure behavior classification method comprises the steps that an evaluation factor set of the hard roof working face strata pressure behavior classification is determined, and various evaluation factor values are obtained; an evaluation set of the hard roof working face strata pressure behavior classification is determined, namely the evaluation grade set of the hard roof working face strata pressure behaviors; fuzzy relations between all factors in the evaluation factor set and the evaluation grades in the evaluation set are built to obtain a fuzzy relation matrix; a weight set of each factor in the evaluation factor set of the hard roof working face strata pressure behavior classification is determined to obtain a weight vector of the factor; and the fuzzy relation matrix and the weight vectors are subjected to composite calculation, and the hard roof working face strata pressure behaviors are classified. According to the mechanics properties and inherent conditions of a hard roof, the working face strata pressure behavior intensity is classified, effective prediction of the working face strata pressure behavior intensity under the condition of the hard roof is achieved, a support scheme of a working face and a mining roadway is adopted in a targeted mode, and safe mining of the working face is achieved.

Description

technical field [0001] The invention belongs to the technical field of mine pressure appearance classification, in particular to a mine pressure appearance classification method on a hard roof working face. Background technique [0002] The hard roof refers to the thick, hard and stable conglomerate, limestone, sandstone and other rock formations that exist above or directly on the top of the coal seam. developmental characteristics. After the coal seam is mined, the hard roof can be exposed in a large area and is not easy to fall naturally. Once it falls, the area of ​​a single collapse is large, and the support pressure and roof pressure are also continuously increasing, accompanied by dynamic phenomena such as strong periodic pressure. , It is easy to cause damage to the support equipment, and even accidents such as casualties. The occurrence conditions of coal seams in my country are very complicated. The coal seams belonging to the hard roof account for about 1 / 3, and...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21F17/00
CPCE21F17/00
Inventor 朱志洁陈蓥韩军张宏伟李胜宋卫华汤国水霍丙杰兰天伟
Owner LIAONING TECHNICAL UNIVERSITY
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