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A softening method for remaining coal pillars in hard coal seams

A technology for left coal pillars and coal seams, which is applied in the field of softening of left coal pillars in hard coal seams, can solve problems such as difficulty in mining the remaining coal pillars in hard coal seams, and achieve the effects of good softening effect, small construction amount, and safe and efficient mining.

Active Publication Date: 2020-08-18
ANHUI UNIV OF SCI & TECH
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Problems solved by technology

[0004] In view of this, the present invention provides a softening method for the left coal pillars of hard coal seams, which solves the technical problem of difficult recovery of the left coal pillars of hard coal seams in the prior art

Method used

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  • A softening method for remaining coal pillars in hard coal seams
  • A softening method for remaining coal pillars in hard coal seams
  • A softening method for remaining coal pillars in hard coal seams

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specific Embodiment

[0041] See attached Figure 2-3 , according to the characteristics of the hard coal pillar to be softened in this embodiment, the scheme for arranging blastholes is determined. According to the thickness L of the coal pillar 1, a row of blastholes 2 is arranged, and the blastholes 2 form an included angle of 60° with the length direction of the coal pillar 1. The width of the coal pillar to be softened is 20m, the length of the blast hole is selected to be 22m, and the diameter is 60mm. There is a certain distance from the reserved hard coal pillar area L5 that is not going to be recovered, and this plan chooses 1m. After comprehensively analyzing the strength and stability of the coal pillar, it is determined that the coal mine gas drainage water-gel explosive with a diameter of 50 mm (that is, a blasting charge made of a special grade 3 coal mine-approved water-gel explosive) is selected as the explosive, and the detonator is made of a mine-approved water-gel explosive. De...

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Abstract

The invention relates to a softening method for a hard coal seam remaining coal pillar. The softening method comprises the steps that according to the parameters of thickness and width of the hard coal seam remaining coal pillar needing to be softened, the schemes of the blast hole arrangement parameter and the hydraulic slotting parameter which correspond to the thickness and width parameters aredetermined; after the blast hole arrangement scheme is determined, blast holes are constructed in the recovery direction by constructors; permissible emulsion explosives for a coal mine are installedinto the constructed blast holes, the sections, without the explosives, of the blast holes are sealed through loess or a cement material, the sealing section is 4-6 m, and when the distance between the sealing position and the free surface N is larger than or equal to 3-5 m, presplitting blasting is conducted; after presplitting blasting, hydraulic slotting is conducted within the blast hole sealing area, accordingly, hole sealing section area coal without being influenced by blasting is internally cracked, and the remaining coal pillar is softened; and the steps are repeated to soften the hard coal seam remaining coal pillar. By adopting shallow hole presplitting blasting, the drilling construction amount is small, and the blasting safety is high; and hydraulic slotting is conducted on the area where the presplitting blasting softening effect is not ideal, the softening effect is good, and safe efficient recovery is facilitated.

Description

technical field [0001] The invention relates to the technical field of hard coal seam softening, in particular to a softening method for leftover coal pillars of hard coal seams. Background technique [0002] After the coal seam is mined, some coal pillars will be left over, and the strength of these remaining coal pillars in hard coal seams is far greater than that of ordinary coal seams, which makes it difficult to recover these coal pillars. In order to avoid the waste of coal resources, it is necessary to recover the hard coal pillars to the greatest extent. [0003] Therefore, how to achieve softening of the remaining coal pillars in hard coal seams is an urgent problem to be solved by those skilled in the art. Contents of the invention [0004] In view of this, the present invention provides a softening method for the left coal pillars of hard coal seams, which solves the technical problem of difficult recovery of the left coal pillars of hard coal seams in the prio...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21C41/18E21C45/00F42D3/00F42D1/00
CPCE21C41/18E21C45/00F42D1/00F42D3/00
Inventor 张向阳张永将赵向阳任启寒袁本庆罗磊任尚磊
Owner ANHUI UNIV OF SCI & TECH
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