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A blasting method for permafrost in open-pit mines

A technology for permafrost and mines, applied in the field of permafrost blasting in open-pit mines, can solve problems affecting blasting efficiency in permafrost, waste of explosives, etc.

Active Publication Date: 2021-09-03
中铁十九局集团矿业投资有限公司
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

[0003] Secondly, in winter, the thickness of the permafrost layer in different places is not the same, and different blasting methods should be used for different thicknesses of the permafrost layer, otherwise it will affect the blasting efficiency of the permafrost layer and lead to waste of explosives

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  • A blasting method for permafrost in open-pit mines
  • A blasting method for permafrost in open-pit mines
  • A blasting method for permafrost in open-pit mines

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Embodiment 1

[0046] The permafrost layer 1 blasting was carried out in the southern open-pit coal mine in Xinjiang. The time was November 2019. The thickness h of the permafrost layer 1 was 1m. The blasting area S was determined to be 20m×20m. The explosive used was ammonium oil explosive. L is 4m, therefore, the depth h of the blast hole 2 1 =0.8h=0.8m, the spacing a of the blast holes 2 is 4m, the depth H of the auxiliary blast holes 3 is 1.25m, between H=1.0h-1.4h, the diameter of the drill bit is 65mm, according to the blasting of various rocks Look up the k-value table of unit explosive unit consumption, and the unit consumption k of explosive in solid permafrost layer 1 is 0.4-0.5kg / m 3 , choose the maximum value in this embodiment, k=0.5kg / m 3 , the row spacing of the row of holes is a, a=4m, the hole spacing of the same row of adjacent blast holes 2 is b, b=4m, therefore, the distance w between the auxiliary blast hole 3 and the blast hole 2 is The blasted frozen soil volume of ...

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Abstract

The invention discloses a method for blasting the permafrost layer in an open-pit mine, comprising the following steps: S1: measuring the thickness h of the permafrost layer; S2: determining the depth of the blasting hole, the depth of the blasting hole being h 1 , h 1 = Between 0.75h‑0.85h; S3: Layout of blast holes, set the blast holes in rows, the row spacing of blast holes is a, a=±5%L, the hole spacing of blast holes is b, b=± 5% L; S4: A co-blasting hole is set at the center of the area enclosed by four adjacent blast holes, the depth of the co-blasting hole is H, H>h, and the distance from the co-blasting hole to the blast hole is w, w

Description

technical field [0001] The invention relates to the technical field of blasting, in particular to a method for blasting permafrost layers in open-pit mines. Background technique [0002] In the non-frozen state, the rock mass has cracks or beddings of the same degree, but after freezing, some or all of the cracks are adhered, which makes the rock mass show a high degree of identity, and also improves the physical and mechanical properties of the rock mass. Great changes have taken place, first of all, its elastic modulus has doubled, and secondly, the resistance of the rock mass to the tensile force and shear force generated after the explosive explosion has increased, making the permafrost layer unsuitable for being broken. [0003] Secondly, in winter, the thickness of the permafrost layers in different places is not the same, and different blasting methods should be adopted for the permafrost layers of different thicknesses, otherwise it will affect the blasting efficienc...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F42D3/04F42D1/00F42D1/10F42D1/18
Inventor 陈立军
Owner 中铁十九局集团矿业投资有限公司
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