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Controlled Blasting Method of Rock Strata with Different Hardness in Deep Hole Bench Blasting

A technology of ladder blasting and hardness, applied in blasting and other directions, can solve problems such as insufficient crushing of hard rock layers, difficulty in achieving crushing effect, waste of explosive energy, etc., achieving small drilling coverage, reducing cost and time, and reducing The effect of chunk rate

Active Publication Date: 2016-04-27
WUHAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

If the traditional single detonation point is used for detonation (forward detonation, reverse detonation, intermediate detonation), the energy of the explosive detonation wave is often concentrated at the bottom of the hole, the hole or near the detonation point, and the result is that the hard rock formation is not fully broken. As a result, the large block rate is too high, but the weak rock formation is excessively broken, wasting a lot of explosive energy
It can be seen that the traditional single-point detonation method is often difficult to achieve the ideal crushing effect, and may even adversely affect the detonation process of the powder column, resulting in detonation

Method used

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  • Controlled Blasting Method of Rock Strata with Different Hardness in Deep Hole Bench Blasting
  • Controlled Blasting Method of Rock Strata with Different Hardness in Deep Hole Bench Blasting
  • Controlled Blasting Method of Rock Strata with Different Hardness in Deep Hole Bench Blasting

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Such as figure 1 As shown, there is a layer of hard rock formation in the middle of the blast hole along the axial direction, and two detonation points are set.

[0028] A face rockfill dam is mining graded materials. The source lithology of the rock field is basalt, some of which are granite. The basalt rocks are weakly weathered. There is a hard granite layer with a thickness of about 2.0m at the depth of 4-6m in the middle of the rock mass. The rock is dense and hard. The blasthole diameter is 100mm, the blasthole depth is 10m, the plugging length is 1.0m, the hole spacing is 2.5m, and the row spacing is 2.2m. Mixed explosives are used to couple the charges.

[0029] Specifically include the following steps:

[0030] 1. Hole layout and drilling, observe and record rock powder, cuttings and drilling speed.

[0031] In the rock mass of the material yard that needs to be excavated by blasting, the blasthole area is manually cleaned, and the surface is blown with a hi...

Embodiment 2

[0039] Such as figure 2 As shown, there are two layers of hard rock formations in the middle of the blast hole along the axial direction, and three detonation points are set.

[0040] The tailings of a copper mine are mined by blasting. There are two layers of copper ore veins in the tailings mine, respectively at the depth of 6.0-8.5m and 12.5-15.5m. The strength of the copper ore is extremely high, and the strength of other rocks is weak of diorite. The blasthole diameter is 120mm, the blasthole depth is 20.0m, the plugging length is 2.0m, and the hole spacing is 4.0m.

[0041] The row spacing is 3.2m, and mixed explosives are used to couple charges.

[0042] Specifically include the following steps:

[0043] 1. Hole layout and drilling, observe and record rock powder, cuttings and drilling speed.

[0044] Manually clean the area to be blasted, and blow the surface with a high-pressure air pipe, and arrange holes in the blast area in strict accordance with the blasting ...

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Abstract

The invention discloses a different-hardness-degree rock stratum blasting control method used in deep-hole bench blasting. The positions and number of detonation points are finely designed, two-point or multiple-point simultaneous detonation is adopted in the drilling blasting design, and detonation wave frontal collision is utilized to improve pressure of wave front, so that energy is centralized to break locally-hard and difficultly-blasted rock stratums, the different-hardness-degree rock stratum blasting problem in the deep-hole bench blasting is solved, the boulder yield in the hard rock stratum blasting is reduced, the safety of a detonating network is improved, and the different-hardness-degree rock stratum blasting control method is efficient, convenient and fast and facilitates quick construction.

Description

technical field [0001] The invention belongs to the technical field of controlled blasting methods, in particular to a controlled blasting method for rock formations with different hardness levels in deep hole step blasting, which is applicable to rock formations with different hardness levels along the axial direction of the blast hole. Deep hole blasting, concentrated energy to break the local hard and difficult rock formations in the blast hole. Background technique [0002] In recent years, with the continuous improvement of deep drilling equipment and loading and transportation machinery, the superiority of deep hole bench blasting, such as small drilling volume per unit, low consumption of explosives, high production efficiency and ease of comprehensive mechanized construction, has become increasingly popular. Attention has been paid to it, and deep hole bench blasting is more and more widely used in slope excavation, mineral mining and foundation excavation. In the c...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F42D1/08F42D3/04
Inventor 冷振东卢文波刘博文陈明严鹏谢理想李继超
Owner WUHAN UNIV
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