Surface mine frozen soil layer blasting method

Abstract

The invention discloses a surface mine frozen soil layer blasting method. The surface mine frozen soil layer blasting method comprises the following steps that S1, the thickness h of a frozen soil layer is measured; S2, the depth of blast holes is determined, the depth of the blast holes is h1, and h1 ranges between 0.75 h and 0.85 h; S3, the blast holes are formed, specifically, the blast holes are arranged in rows, the row spacing of the blast holes is a, a is equal to + / -5% L, the hole spacing of the blast holes is b, and b is equal to + / -5% L; S4, a blast assisting hole is formed in the center of the area defined by the four adjacent blast holes, and the depth of the blast assisting hole is H, H is greater than h, the distance from the blast assisting hole to the blast holes is w, and w is smaller than a and b; S5, the explosive quantity in the blast holes is determined, q=kV-kbHw, q is the explosive quantity loaded in each blast hole, k is explosive unit consumption, and V is the volume of blast frozen soil of each blast hole; S6, charging and sealing are conducted; and S7: detonating is carried out. The surface mine frozen soil layer blasting method has the beneficial effects that through alternate arrangement of the blasting holes and the blast assisting hole, blasting of the surface mine frozen soil layer is facilitated, the best blasting efficiency is achieved, and the explosive amount is not wasted.

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...

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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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