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Local filling mining method for longwall face along strike of steeply dipping seam

A mining method and working face technology, applied in filling, ground mining, mining equipment, etc., can solve problems such as low production efficiency of working face, poor stability of "support-surrounding rock" system, difficult roof management, etc., and achieve layout design Reasonable, easy to implement, and the effect of increasing length

Inactive Publication Date: 2015-12-09
XIAN UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Purpose of the invention: Aiming at the deficiencies of the above-mentioned prior art, the present invention provides a local filling mining method for a large-inclination coal seam towards the longwall working face, which has a reasonable design and a simple mining method, and can effectively solve the Practical problems such as difficulty in roof management, poor stability of the "bracket-surrounding rock" system, and low production efficiency of the working face caused by rock stress distribution and deformation failure imbalance

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  • Local filling mining method for longwall face along strike of steeply dipping seam
  • Local filling mining method for longwall face along strike of steeply dipping seam
  • Local filling mining method for longwall face along strike of steeply dipping seam

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specific Embodiment 1

[0061] The local filling mining method for the longwall working face of a large dip angle coal seam (a coal seam with a dip angle within the range of 35° to 55°) includes the following steps:

[0062] (1) Determine the layout and parameters of the local filling face

[0063] (11), select a pseudo-inclined longwall working face as the actual mining face of the high-inclination coal seam, the angle between the pseudo-inclined longwall working face and the true inclined working face is 0°,

[0064] (12) Partially fill the upper area of ​​the actual mining face, the inclination length L of the actual mining face is 200m, and the length of the filling area of ​​the actual mining face is L 1 80m;

[0065] (2), mining coal seam

[0066] (21), adopt comprehensive mechanized partial filling mining method mining, take the pseudo-incline longwall working face determined in step (1) as the actual mining working face, and carry out working face mining with the direction of the large dip ...

specific Embodiment 2

[0076] Roughly the same as the specific embodiment 1, the only difference is

[0077] In step (11), the included angle between the pseudo-inclined longwall working face and the true inclined working face is 7°;

[0078] The inclination length L of the actual mining face in step (12) is 133m, and the filling area length L of the actual mining face is 1 is 53.2m;

[0079] In step (22), the support of the working face adopts six-column support in the filling area to support the middle hinged double pushing device to fill the hydraulic support; in the non-filling area, the hydraulic support is used;

[0080] Use gangue and fly ash as solid filling materials, the mass ratio of gangue and fly ash is 1:0.3, the particle size of gangue is less than 30mm, the moisture content of solid filling material is 25%, and the filling rate of the filling area is not less than 90%.

specific Embodiment 3

[0081] Roughly the same as the specific embodiment 1, the only difference is

[0082] In step (11), the included angle between the pseudo-inclined longwall working face and the true inclined working face is 5°;

[0083] In step (12), the inclination length L of the actual mining face is 150m, and the filling area length L of the actual mining face is 1 60m;

[0084] In step (22), the support of the working face adopts six-column support in the filling area, and the middle hinged double push device is used to fill the hydraulic support; in the non-filling area, a four-column support shielding hydraulic support is used;

[0085] Use gangue and fly ash as solid filling materials, the mass ratio of gangue and fly ash is 1:0.3, the particle size of gangue is less than 30mm, the moisture content of solid filling material is 23%, and the filling rate of the filling area is not less than 90%.

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Abstract

The invention relates to a local filling mining method for a longwall face long a strike of a steeply dipping seam. The local filling mining method comprises the following steps: (1) determining a layout form and parameters of a local filling face; (2) mining the seam. The filling mining method for the longwall face along a strike of the steeply dipping seam has the following beneficial effects that (1) the local filling face is reasonable in layout design, and the mining method is simple and convenient; (2) the adopted longwall face comprehensive mechanized local filling mining method for the longwall face along the strike of the steeply dipping seam and the face are of a false-inclined layout form, so that the length of the steeply dipping face is increased, and the danger coefficient existing in a steeply dipping seam mining process is greatly reduced to lay a foundation for safe and highly-efficient production of like seams; meanwhile, the coal recovery rate of the face is increased on the premise of ensuring the stability of a 'support-surrounding rock' system, and the contradiction between 'the face yield-quality and the support-surrounding rock stability' of the face of the steeply dipping seam is effectively solved.

Description

technical field [0001] The invention relates to a filling mining method towards a longwall working face, in particular to a partial filling mining method of a large dip angle coal seam towards a longwall working face. Background technique [0002] A coal seam with a large dip angle refers to a coal seam with a burial dip angle of 35° to 55°. Affected by the dip angle of the coal seam, the stress distribution of the surrounding rock in the stope, the deformation and failure of the overlying rock, and the filling of gangue are unbalanced, resulting in the migration of the "key domain" of the surrounding rock in the stope. It is a kind of coal seam with special burial conditions and a difficult-to-mine coal seam recognized by the international mining community due to the variation with the rock mass structure, difficulty in controlling the stability of the "support-surrounding rock" in the working face, low production efficiency and many safety hazards. [0003] At present, wit...

Claims

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Application Information

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IPC IPC(8): E21C41/18E21F15/06
Inventor 王红伟伍永平曹沛沛
Owner XIAN UNIV OF SCI & TECH
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