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Coal-pillar-free self-roadway-forming balanced mining method and equipment

A mining method and technology without coal pillars, applied in mining equipment, ground mining, installation of bolts, etc., can solve problems such as unbalanced force, support system failure, roadway instability, etc., and achieve the effect of avoiding uneven settlement

Inactive Publication Date: 2022-01-11
CHINA UNIV OF MINING & TECH (BEIJING)
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Problems solved by technology

[0006] (3) When mining adjacent working faces, in order to ensure the safety of the mining roadway, the 121 construction method adopts high-strength support to resist mine pressure. At this time, the force of the roadway support system is unbalanced. Protection system failure, roadway instability and other problems

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Embodiment Construction

[0044] Preferred embodiments of the present invention are described below with reference to the accompanying drawings. Those skilled in the art should understand that these embodiments are only used to explain the technical principles of the present invention, and are not intended to limit the protection scope of the present invention.

[0045] The design principle of the balanced mining method and equipment provided by the present invention is: according to the roof movement characteristics after mining, the mining damage invariant equation is established K 1 + K 2 + K 3 =1, from the perspective of mining rock mechanics, analyze the rock formation damage produced in each stage of the mining process, and control the balance between the crushed volume of the roof collapsed gangue and the mining volume, that is, △V B =△ V m , K 3 =1, substituting into the mining damage invariant equation, we can get K 1 and K 2 Both are 0, and the mining damage invariant equation ha...

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Abstract

The invention discloses a coal-pillar-free self-roadway-forming balanced mining method and equipment. The method comprises the following steps: performing coal mining on a working surface, and reserving and maintaining a roadway space at the same time; obtaining the mining volume and the breaking and expanding coefficient of roof caving gangue corresponding to the working face; based on the breaking and expansion coefficient and the mining volume, obtaining the roof cutting height of the end of the working face roof, so that the breaking and expansion volume of roof caving gangue is equal to the mining volume; performing vertical joint cutting on the roof at the end of the working face based on the top cutting height; and performing gangue blocking support on the roadway space and forming a roadway side. According to the method, directional joint cutting is performed on the side roof of the roadway goaf, so that under the action of self weight and mine ground pressure, the overlying roof rock stratum on the goaf collapses in a large area within the height range of the joint cutting, the goaf is fully broken and expanded, the broken expansion amount of collapsed gangue is equal to the mining amount, and automatic balance of the working face goaf is achieved.

Description

technical field [0001] The invention relates to the technical field of coal mine mining, in particular to a method and equipment for balanced mining of self-forming lanes without coal pillars. Background technique [0002] my country's underground coal mining mainly adopts the longwall mining 121 method, that is, to mine one working face, two roadways need to be excavated in advance, and one coal pillar is left. [0003] See attached Figure 6 , the mining volume in the 121 construction method △Vm is a known quantity, the surface subsidence volume △V S can be obtained by measurement, so as to determine the surface settlement damage variable K 1 size, but the fracture volume of the roof stratum △ V C and roof collapse gangue crushing volume △ V B Uncontrollable, so the rock formation fracture damage variable K in the fractured zone 2 and the collapsed gangue damage variable K 3 The size cannot be determined, which leads to the inability to solve the mining damage in...

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Application Information

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IPC IPC(8): E21C41/18E21F15/00E21F15/02E21D20/00E21F13/00
CPCE21C41/18E21F15/00E21F15/02E21D20/00E21F13/00
Inventor 何满潮王琦王亚军杨军江贝秦乾高红科
Owner CHINA UNIV OF MINING & TECH (BEIJING)
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