Support method for span reduction with double micro-arches in large-span cut-outs

A large-span, cutting-hole technology, applied in the direction of supporting the roof beam of the mine roof, earth-moving drilling, mining equipment, etc., to achieve the effect of reducing supporting costs, easy control of surrounding rock, and low supporting difficulty

Inactive Publication Date: 2011-12-07
SHANXI LUAN ENVIRONMENTAL ENERGY DEV +1
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Conventional support methods cannot be used for the control of large-span cutouts on composite roofs, and the span must be reduced before supporting. Especially, the support problem of large-span cutouts in deep areas with complex structures in high-gas mines needs to be solved urgently.

Method used

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  • Support method for span reduction with double micro-arches in large-span cut-outs
  • Support method for span reduction with double micro-arches in large-span cut-outs
  • Support method for span reduction with double micro-arches in large-span cut-outs

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Embodiment Construction

[0015] An embodiment of the present invention will be further described below in conjunction with accompanying drawing:

[0016] Such as figure 1 As shown, the span c of a cut hole in a certain mine is 8m, and the height is 3.2m. The roof is a composite roof of sandstone and mudstone.

[0017] According to the surrounding rock conditions of the large-span cut hole in the composite roof, a small-section micro-arch roadway 1 is firstly excavated on the side of the coal pillar in the gob. The height is h, and the stress of the surrounding rock is released by excavating the small-section micro-arch roadway 1 to reduce the difficulty of support. Through numerical simulation, physical simulation and theoretical analysis, the support method and parameters of the small-section micro-arch roadway are determined, and anchor rods, metal mesh, anchor cables and steel belts are used to support the side and roof of the small-section micro-arch roadway 1, and the anchor net The anchor cabl...

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Abstract

The invention discloses a span-reducing support method with double micro-arches for large-span cutouts, which is suitable for span-reduction support in areas with complex structures and deep composite roofs with large-span cutouts. The secondary roadway is used instead of the first roadway, and the double micro-arch cutout is used to replace the traditional one-time long-span rectangular cutout, and the prestressed anchor/cable is used to strengthen the surrounding rock of the cutout. The distribution law of the plastic zone of the surrounding rock of the micro-arch cutout, select reasonable support parameters, give full play to the support function of the prestressed anchor rod/cable, add a row of single pillars and top beams to reduce the span support in the double micro-arch cutout protection, the top control effect is obvious. For large-span cutouts, the span reduction support method of secondary roadway formation + double micro-arch sections + anchor net cables + single pillars and hinged roof beams was adopted to solve the problem of difficult control of the roof of long-span rectangular cutouts and realize The large-span cutting eye is fast, safe and economical to construct, and its method is simple and easy to implement, with low support cost and good support effect.

Description

technical field [0001] The invention relates to a double-micro-arch span reduction support method for a large-span incision, which is especially suitable for the stability control of the large-span incision in complex-structured areas and deep composite roofs. Background technique [0002] In recent years, in order to increase the speed of roadway excavation and reduce the cost of roadway construction, the section shape of the mining roadway is mostly rectangular. In order to meet the high-yield and Larger, the stability of the roof of the roadway will decrease, and the difficulty of roof control will continue to increase, and sometimes it will even be the main factor leading to the occurrence of roof fall accidents in the mining roadway with bolt support, which seriously threatens the life safety of underground personnel. The mining depth of the mine is increasing, especially the deep large-section and long-span composite roof roadway affected by the structural stress. The ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21D9/14E21D21/00E21D17/10
Inventor 王强徐金海李冲李安洪李良兵吴锐张玉东吴增光李广兴王中奎马超
Owner SHANXI LUAN ENVIRONMENTAL ENERGY DEV
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