Cutting blasting method based on pre-blasting

A technology of pre-blasting and cutting holes, which is applied in blasting and other directions, can solve the problems of low utilization rate of blast holes, poor cutting effect, and large blasting supply that cannot be cut, so as to overcome the effect of surrounding rock sandwiching and improve The effect of the gouging effect

Active 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, at present, due to the limitation of drilling equipment, it is difficult to obtain large-diameter hollow holes, which cannot provide a large free surface and rock breaking space for cutting blasting. As a result, the overall blast hole utilization rate is low

Method used

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  • Cutting blasting method based on pre-blasting
  • Cutting blasting method based on pre-blasting
  • Cutting blasting method based on pre-blasting

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] In this embodiment, the cutting blasting method based on pre-blasting is adopted for a section of a roadway without gas and coal dust explosion hazards, such as Figure 1-5 As shown, the specific operation steps are as follows:

[0040] 1) Drill a central charging hole 1 in the center of the cutting area, drill a circle of empty holes 2 around the central charging hole 1, drill four main cutting holes 3 and four compensation cutting holes around the empty hole 2 4. The four compensation cut holes 4 are arranged in a square shape, the four main cut holes 3 are all located in the center of the line connecting the adjacent compensation cut holes 4, and auxiliary holes, caving holes and peripheral holes are sequentially drilled outside the cut holes;

[0041] Among them, based on the lithology and drilling equipment, the depth of the central charging hole 1, the main cutting hole 3 and the compensation cutting hole 4 is designed to be 2400mm, the depth of the empty hole 2 i...

Embodiment 2

[0051] This embodiment also adopts the cutting blasting method based on pre-blasting for a roadway without gas and coal dust explosion hazard. 0.6 times of the radius of the crack circle of charge hole 1, bring relevant parameters into The radius of the crack circle of the center charging hole 1 is 347mm, and the radius of the circle where the empty hole 2 is located is equal to 208mm. To facilitate the drilling operation, the radius of the circle where the empty hole 2 is located is 210mm, and the diameter of the circle where the empty hole 2 is located is 420mm. ;

[0052] Among them, the side length of the square where the main cut hole 3 and the compensation cut hole 4 are designed is twice the diameter of the circle where the empty hole 2 is located, which is equal to 840mm after calculation;

[0053] Among them, the distance between the designed empty holes 2 is 4 times the diameter of the empty holes 2, which is equal to 168 mm after calculation. To facilitate the dri...

Embodiment 3

[0056] This embodiment also adopts the cutting blasting method based on pre-blasting for a tunnel without gas and coal dust explosion hazard. 0.6 times of the radius of the crack circle of charge hole 1, bring relevant parameters into The radius of the crack circle of the center charging hole 1 is 347mm, and the radius of the circle where the empty hole 2 is located is equal to 208mm. To facilitate the drilling operation, the radius of the circle where the empty hole 2 is located is 210mm, and the diameter of the circle where the empty hole 2 is located is 420mm. ;

[0057] Among them, the side length of the square where the main cut hole 3 and the compensation cut hole 4 are designed is twice the diameter of the circle where the empty hole 2 is located, which is equal to 840mm after calculation;

[0058] Among them, the distance between the designed empty holes 2 is 4 times the diameter of the empty holes 2, which is equal to 168 mm after calculation. To facilitate the dril...

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Abstract

The invention relates to a cutting blasting method based on pre-blasting. The cutting blasting method comprises the following steps: (1) a center charge hole is drilled in the center of a cut area, acircle of empty holes are drilled in the periphery of the center charge hole, main cutting holes and compensation cutting holes are drilled in the peripheries of the empty holes, and auxiliary holes,breaking holes and peripheral holes are sequentially drilled in the outer sides of the cutting holes; (2) the center charge hole is continuously filled with an explosive, the main cutting holes and the compensation cutting holes are continuously filled with 1 / 2 cumulative charge and 1 / 4 cumulative charge correspondingly, the auxiliary holes, the breaking holes and the peripheral holes are continuously filled with explosives, and blast holes are blocked by stemming; (3) the center charge hole is separately initiated to form a pre-blasted area; and (4) the remaining blast holes adopt micro-delayinitiation to achieve full-face one-time blasting. A large free face and rock breaking expansion space can be provided for cutting blasting, the surrounding rock clamping effect is overcome, the cutting effect is improved, and the overall blast hole utilization rate is increased.

Description

technical field [0001] The invention relates to a cutting blasting method, in particular to a cutting blasting method based on pre-blasting. Background technique [0002] Drill and blast method, as an efficient construction method, is widely used in mining rock mass excavation engineering. 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, which is convenient for medium and deep hole blasting; the cutting parameters can not be changed with the depth of the blast hole and...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F42D1/08F42D3/04
CPCF42D1/08F42D3/04
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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