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Cutting blasting method based on kerf precutting and bottom reinforced throwing

A pre-cutting and slitting technology, applied in blasting and other directions, can solve the problems of poor cutting effect, enhanced clamping effect, poor blasting effect, etc., to improve the cutting effect, overcome the influence of surrounding rock stress, and overcome clamping effect for making

Inactive Publication Date: 2020-09-15
ANHUI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the traditional straight hole cutting method has the following problems: firstly, due to the limitation of drilling equipment, it is difficult to obtain a large diameter hole, the free surface and the rock breaking and expansion compensation space are relatively small, and the rock in the cavity is broken. Finally, it is difficult to throw out completely; the second point is that the surrounding rock has a clamping effect on the cutting cavity, and the clamping effect is enhanced with the increase of the depth of the blast hole, making it difficult to throw out the rock mass in the cavity; the third point is that when digging deep During excavation, there is a high surrounding rock stress, and the influence of the surrounding rock stress will strengthen the clamping effect of the surrounding rock on the rock mass in the cavity, making it difficult to throw out the rock mass in the cavity
The above reasons make the cutting effect of the existing straight hole cutting blasting not good, and cannot provide a large free surface for the subsequent blasting, which leads to poor overall blasting effect

Method used

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  • Cutting blasting method based on kerf precutting and bottom reinforced throwing
  • Cutting blasting method based on kerf precutting and bottom reinforced throwing

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] In a deep coal mine rock roadway, the cutting blasting method based on kerf pre-cutting and bottom enhanced throwing is adopted, including the following steps:

[0039] 1) Drilling: Drill a center cut hole 1 in the center of the design cut area, drill a circle of pre-cut cut holes 3 around the center cut hole 1, center cut hole 1 and pre-cut cut hole 3 Three throwing cut holes 2 are drilled between them, the center cut hole 1, the throw cut hole 2 and the pre-cut cut hole 3 have a depth of 2200mm. The depth of peripheral holes, auxiliary holes, caving holes and peripheral holes is 2000mm, and the diameter of all blast holes is 42mm;

[0040]2) Charge: 4 rolls of 35mm diameter water-gel explosives are loaded in the center slot 1, 0.8 rolls of 35mm diameter water-gel explosives are loaded at the bottom of the throwing slot 2, and the charge length of the throwing slot 2 is the center slot 1 pack 0.2 times the length of the charge, the pre-cut slotting hole 3 is filled wi...

Embodiment 2

[0044] Concrete method step is identical with embodiment 1, difference is:

[0045] The difference is that 4 throwing cut holes 2 are drilled between the center cut hole 1 and the pre-cut cut hole 3. The depth of the center cut hole 1, the throw cut hole 2 and the pre-cut cut hole 3 is 2350mm. The charge length of the throwing cut hole 2 is 0.25 times the charge length of the center cut hole 1, and the auxiliary hole, the collapse hole and the peripheral hole are drilled in sequence on the outside of the pre-cut cut hole 3, and the depth of the auxiliary hole, the collapse hole and the peripheral hole is 2000mm, the center cut hole 1 is filled with 4 volumes of water gel explosives with a diameter of 35mm, and the bottom of the throwing hole 2 is filled with a roll of water gel explosives with a diameter of 35mm. In the cutting hole 3, the charge uncoupling coefficient of the pre-cutting hole 3 is 42 / 24=1.75, and the FRP pipe with an inner diameter of 24mm and a wall thickness...

Embodiment 3

[0047] Concrete method step is identical with embodiment 1, difference is:

[0048] The difference is that 5 throwing cut holes 2 are drilled between the center cut hole 1 and the pre-cut cut hole 3. The depth of the center cut hole 1, the throw cut hole 2 and the pre-cut cut hole 3 is 2500mm. The charge length of the throwing cut hole 2 is 0.3 times the charge length of the center cut hole 1, and the auxiliary hole, the collapse hole and the peripheral hole are drilled in sequence on the outside of the pre-cut cut hole 3, and the depth of the auxiliary hole, the collapse hole and the peripheral hole is 2000mm, the center cut hole 1 is loaded with 4 volumes of water gel explosives with a diameter of 35mm, and the bottom of the throwing hole 2 is filled with 1.2 rolls of water gel explosives with a diameter of 35mm. In the cutting hole 3, the non-coupling coefficient of the pre-cutting hole 3 is 42 / 21=2.0, and the FRP pipe with an inner diameter of 21mm and a wall thickness of ...

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Abstract

The invention discloses a cutting blasting method based on kerf precutting and bottom reinforced throwing, which belongs to the technical field of cutting blasting and comprises the following steps: step 1, drilling a center cutting hole at a center of a cutting region, drilling a precutting cutting hole circularly around the center cutting hole, and drilling a plurality of throwing cutting hole between the center cutting hole and the precutting cutting hole; step 2, filling the center cutting hole and the throwing cutting hole with a cartridge, and filling the precutting cutting hole with precutting kerf explosive; step 3, performing full cross-section blasting through micro-delay initiation. In the method provided by the invention, the precutting cutting hole is filled with the precutting kerf explosive, thus, a clamping function of surrounding rocks can be overcome, rocks in a groove cavity can be thrown out fully, and cutting effect is improved remarkably.

Description

technical field [0001] The invention relates to the technical field of cutting blasting, in particular to a cutting blasting method based on kerf pre-cutting and bottom reinforced throwing. Background technique [0002] Cutting blasting in rock roadway excavation is the key to determining the overall rock breaking effect and the size of the cycle footage. A reasonable cutting method is conducive to blasting the rock mass into a cavity and providing a larger free surface for subsequent blasting. Based on the spatial position relationship between the cut hole and the face, cut blasting is usually divided into straight hole cut and inclined hole cut. Among them, the advantages of straight hole cutting are: the depth of the blast hole is not limited by the size of the section; the cutting parameters can not be changed with the depth of the blast hole and the section; . Therefore, straight hole cutting is a commonly used cutting method in rock roadway blasting excavation. [0...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F42D3/04
CPCF42D3/04
Inventor 程兵汪海波王梦想宗琦吕闹吴捷豪
Owner ANHUI UNIV OF SCI & TECH
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