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Hard rock stone head deep hole slotting and blasting method

A rock roadway and hard rock technology, which is applied in blasting and other directions, can solve the problems of low blasting efficiency, large clamping effect, and large number of blast holes, so as to improve the utilization rate of blast holes, reduce the clamping effect, and improve blasting efficiency. Effect

Inactive Publication Date: 2017-12-12
CHINA UNIV OF MINING & TECH (BEIJING) +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the small cavity formed by the straight hole cutting, the clamping effect is large when the deep hole is excavated in large-section hard rock, the number of blast holes is large, the drilling operation takes a long cycle time, and the utilization rate of the blast holes is not high, resulting in blasting efficiency. low
[0005] Therefore, no matter which of the above-mentioned cutting methods is adopted in the rock tunnel surrounding rock cutting blasting at the present stage, there is a problem of low blast hole utilization rate of the cutting hole, which makes the blasting efficiency low and affects the rock tunnel excavation level.

Method used

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  • Hard rock stone head deep hole slotting and blasting method
  • Hard rock stone head deep hole slotting and blasting method
  • Hard rock stone head deep hole slotting and blasting method

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Embodiment 1

[0079] see Figure 1 to Figure 4 As shown in the figure, the embodiment of the present invention is a deep hole cutting method for hard rock roadways, which is mainly suitable for rock drilling operations, tunnels, roadway operations, and blasting engineering operations such as mines. Roadways with a property coefficient (Platinum coefficient) f greater than or equal to 7 also include hard rock roadways determined by other arbitrary surrounding rock classification methods. The deep hole in the embodiment of the present invention specifically refers to a blast hole with a blast hole depth greater than or equal to any depth of 2.5m or more, especially refers to a blast hole with a depth of 2.5-3.5m. Including steps: S11, symmetrically arrange the main undercut hole 1 and the center hole 2 below the intersection of the roadway arching line X and the center line Y; S12, arrange the secondary undercut hole 3 between the main undercut hole and the center hole . The number of the m...

Embodiment 2

[0091] see Figure 5 As shown in the figure, an embodiment of the present invention is a deep hole undercut blasting method for hard rock roadway, which is characterized in that it includes the steps of: S21, symmetrically arranging main undercut holes and secondary undercuts at the intersection of the roadway arching line and the center line hole and center hole; S22, charging rolls into the main undercutting hole, secondary undercutting hole and center hole; S23, blocking the main undercutting hole, secondary undercutting hole and center hole; S24, first align all the Detonating the central hole and the secondary undercutting hole; S25, detonating the primary undercutting hole again.

[0092] The embodiment of the present invention is a deep hole undercut blasting method for hard rock roadway. By arranging primary and secondary undercut holes, the secondary undercut hole and the central hole are blasted first, and then the main undercut hole is blasted. The deep hole blasti...

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Abstract

The invention discloses a hard rock stone head deep hole slotting and blasting method, relates to the technical field of deading by drilling and blasting methods, and can effectively increase the utilization rate of slotting holes and blast holes to improve the blasting efficiency. The slotting method comprises the following steps: a main slotting hole and a center hole are symmetrically arranged below the intersection of a roadway springing line and a center line; and a secondary slotting hole is formed between the main slotting hole and the center hole. The blasting method comprises the following steps: the main slotting hole, the secondary slotting hole and the center hole are symmetrically arranged below the intersection of the roadway springing line and the center line; cartridges are loaded in the main slotting hole, the secondary slotting hole and the center hole; the main slotting hole, the secondary slotting hole and the center hole are blocked; the center hole and the secondary slotting hole are blasted firstly; and then, the main slotting hole is blasted. The hard rock stone head deep hole slotting and blasting method is suitable for such blasting tunneling engineering as hard rock stone heads, tunnels and caves.

Description

technical field [0001] The invention relates to the technical field of drilling and blasting rock roadway excavation, in particular to a deep hole cutting and blasting method for hard rock rock roadways. Background technique [0002] In my country, the excavation level of drilling and blasting rock roadway is always hovering at the level of 70m / month, which leads to unbalanced excavation and seriously restricts the continuous production of coal mines. The development of rock tunnelling construction technology is crucial to the improvement of rock tunnelling level and alleviation of excavation contradictions. Among them, the drilling and blasting method has mature technology and low cost, and occupies a dominant position in rock roadway excavation. And undercut is one of the important links of drilling and blasting in rock roadway. At this stage, with the continuous increase of blast hole depth, under hard rock conditions, undercut blasting is generally used. [0003] The ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F42D1/00F42D3/04
CPCF42D1/00F42D3/04
Inventor 杨仁树张召冉马鑫民杨国梁许鹏左进京陈程王雁冰
Owner CHINA UNIV OF MINING & TECH (BEIJING)
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