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Rock roadway deep hole loose blasting method based on axial multi-point simultaneous detonating

A loose blasting and multi-point detonation technology, applied in blasting, blasting cylinders, offensive equipment, etc., can solve the problems of increasing the harmful effect of blasting vibration and increasing the difficulty of drilling, so as to improve the effect of loosening blasting, improve blasting ability, Increased damage damage effect

Pending Publication Date: 2020-11-20
ANHUI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, drilling large-diameter blastholes increases the difficulty of drilling, and blasting with large-diameter charge coils will increase the harmful effect of blasting vibration

Method used

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  • Rock roadway deep hole loose blasting method based on axial multi-point simultaneous detonating
  • Rock roadway deep hole loose blasting method based on axial multi-point simultaneous detonating
  • Rock roadway deep hole loose blasting method based on axial multi-point simultaneous detonating

Examples

Experimental program
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Effect test

Embodiment 1

[0044] In this embodiment, there are difficulties in using a fully-mechanized excavator for excavation of a hard rock roadway. Before excavation by a fully-mechanized excavator, a rock roadway deep-hole loosening blasting method based on simultaneous detonation at multiple points in the axial direction is adopted, including the following steps:

[0045] 1) Drill holes 3 with a depth of 25m and a diameter of 75mm at equal intervals in the section 1 of the rock roadway, and use the secondary coal mine permitted water gel explosive on site;

[0046] Among them, the following parameters are known: blast hole 3 radius r b =37.5mm, explosive density ρ 0 =1100kg·m -3 , Explosive detonation velocity D=3200m·s -1 , explosive radius r c =30mm, uncoupling coefficient K=1.25, adiabatic index k=3, enhancement coefficient n=10, rock Poisson’s ratio μ=0.2, rock tensile strength T=9.8MPa, rock compressive strength C=105.1MPa, stress wave Attenuation index α=1.75, substitute relevant param...

Embodiment 2

[0053] This embodiment is also aimed at the difficulty in excavating a certain hard rock roadway using a fully-mechanized excavator. Before excavation by a fully-mechanized excavator, a rock roadway deep-hole loosening blasting method based on simultaneous detonation at multiple points in the axial direction is adopted. The specific implementation method steps are the same as in the embodiment. 1. The difference is:

[0054] The distance between the blast hole 3 is 3.0 times the radius of the crack circle of the blast hole 3, which is equal to 1.5m, and the distance between the blast hole 3 and the section profile 2 of the rock roadway is 1.5 times the radius of the crack circle of the blast hole 3, which is equal to 0.75m; the reserved section 6 The length is 60 times the diameter of the explosive equal to 3.6m, and the distance between the high-precision detonators 8 is 50 times the diameter of the explosive equal to 3.0m. According to the design of the charge section 4 with ...

Embodiment 3

[0056] This embodiment is also aimed at the difficulty in excavating a certain hard rock roadway using a fully-mechanized excavator. Before excavation by a fully-mechanized excavator, a rock roadway deep-hole loosening blasting method based on simultaneous detonation at multiple points in the axial direction is adopted. The specific implementation method steps are the same as in the embodiment. 1. The difference is:

[0057] The distance between the blast hole 3 is 2.5 times the radius of the crack circle of the blast hole 3, which is equal to 1.25m, and the distance between the blast hole 3 and the section profile 2 of the rock roadway is 1.25 times the radius of the crack circle of the blast hole 3, which is equal to 0.625m; the reserved section 6 The length is 50 times the diameter of the explosive equal to 3.0m, and the distance between the high-precision detonators 8 is 40 times the diameter of the explosive equal to 2.4m. According to the design of the charge section 4 wi...

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Abstract

The invention discloses a rock roadway deep hole loose blasting method based on axial multi-point simultaneous detonating. The method comprises the following steps that firstly, blast holes are drilled in a to-be-blasted rock roadway section at equal distance; secondly, the charging segment of each blast hole is divided into two segments from the hole bottom to the hole opening, namely, a multi-point detonating section and a reservation section, the multi-point detonating sections are continuously charged with explosives, multiple same-segment detonators are arranged in each multi-point detonating section in the axial direction of the corresponding blast hole at equal distance, the reservation sections are continuously charged with explosives, and stemming is adopted for blocking non-charged sections above the reservation sections; and thirdly, blasting is carried out between the different blast holes in a millisecond delay method. By means of the method, explosive energy can be fullyutilized, the blasting cracking range can be widened, and the rock roadway deep hole loose blasting effect can be improved.

Description

technical field [0001] The invention relates to the technical field related to blasting, in particular to a rock roadway deep hole loosening blasting method based on axial multi-point simultaneous detonation. Background technique [0002] With the development of mine rock mass excavation in the direction of mechanization, modernization and intelligence, fully mechanized excavators have been vigorously promoted and applied in rock roadway excavation. For soft rock with a firmness coefficient less than 6, the fully mechanized excavator can often cut smoothly, and has a higher driving speed and better roadway formation. However, due to complex and changeable geological conditions, some hard rocks with a firmness coefficient greater than 7 are often encountered during construction. It becomes difficult for the fully mechanized excavator to cut such rocks, which will not only reduce the operating efficiency of the mechanized excavator, but also consume a lot of saw teeth job cos...

Claims

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Application Information

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IPC IPC(8): F42D3/04F42D1/00F42D1/08F42D1/06F42D1/04F42B3/22
CPCF42D3/04F42D1/00F42D1/08F42D1/06F42D1/04F42B3/22
Inventor 程兵汪海波王梦想宗琦高朋飞高圣涛黄献文
Owner ANHUI UNIV OF SCI & TECH
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