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Method for improving blasting tunneling footage by optimizing positions of cut holes and empty holes

A technology for blasting cutting footage and cutting holes, which is applied in design optimization/simulation, earth-moving drilling, mining equipment, etc., and can solve problems such as difficult blasting conditions and failure to achieve blasting effects.

Pending Publication Date: 2022-06-28
云南交投公路建设第六工程有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, cutting blasting is the key to tunneling blasting. A new free surface is blasted out of the cutting hole, creating more favorable blasting conditions for other blast holes. The effect of tunneling blasting mainly depends on the effect of cutting blasting. There is a free surface on the surface, the surrounding rocks have great clamping properties, and the blasting conditions are difficult. By arranging large-diameter hollow holes in the cut area, more favorable conditions are created for the cut blasting. The hollow holes in the cut blast are not only for the cavity Rock fragmentation provides initial compensation space, and more importantly, it changes the stress distribution in the rock near the hole and the blasting effect of adjacent slots. This phenomenon is called the hole effect of cutting blasting. The crushing and throwing of the cut rock and the formation of the cavity play an important role in promoting, but the existing arrangement of cut holes and hollow holes has not yet achieved the best blasting effect

Method used

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  • Method for improving blasting tunneling footage by optimizing positions of cut holes and empty holes
  • Method for improving blasting tunneling footage by optimizing positions of cut holes and empty holes
  • Method for improving blasting tunneling footage by optimizing positions of cut holes and empty holes

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Embodiment 1

[0049] A method for optimizing the positions of undercut holes and empty holes to increase blasting footage, comprising the following steps:

[0050] S1. Selection of test site: The test site is Dahongshan Copper Mine, the ore rock of Dahongshan Copper Mine is mainly marble, and the rock mechanical parameters of marble are close to those used in numerical simulation.

[0051]S2. Selection of the diameter of the undercut hole and the hollow hole: the diameter of the undercut hole is 50mm, and the undercut hole is the charging hole for placing explosives. The hole diameter ratio needs to be greater than 1.7.

[0052] S3. Selection of the hole distance between the undercut hole and the hollow hole: the undercut hole is divided into the first blast hole, the second blast hole and the third blast hole. The distance between the first blast hole and the hollow hole is affected by the compensation space and the explosive crushing range. The first blast hole is blasted to form a groov...

Embodiment 2

[0071] A method for optimizing the positions of the undercut holes and the hollow holes to improve the blasting footage, on the basis of the first embodiment, in S2, the selection of the undercut holes and the hole diameters of the hollow holes satisfies the following formula:

[0072]

[0073] Among them: D is the diameter of the hollow hole; d is the diameter of the charge hole, α is the rock blasting fracture angle, D≥85mm, and when vertical cutting is used, α>30° is required.

[0074] It should be noted that, when the diameter of the hollow hole is larger than the diameter of the charging hole, and the formula (1) is satisfied, not only the rock between the hollow hole and the charging hole can be broken, but also a crushing funnel can be formed.

[0075] In S2, a large-diameter hollow hole is selected as the free surface, and the hollow hole is parallel to the charging hole in the free surface to form a sufficient compensation space.

[0076] In S3, the compensation sp...

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Abstract

The invention discloses a method for improving blasting tunneling footage by optimizing positions of cut holes and hollow holes, which comprises the following steps of: selecting a test site: selecting the test site as Dahongshan copper ore, selecting the diameters of the cut holes and the hollow holes, the cutting holes are divided into first blasting holes, second-section blasting holes and third-section blasting holes, the distance between the first blasting holes and the hollow holes is influenced by compensation space, explosive crushing range and charging hole deflection, hollow hole model design is carried out, the hollow holes are located in the center of the model, scheme design and simulation are carried out, and the hole distance between the hollow holes and the hollow holes is determined. A cut blasting hole arrangement scheme obtained through theoretical analysis and numerical simulation is applied to field practice, and errors of the cross-sectional area, width and height of a finally obtained cut cavity and a simulation result are all within 6%, which shows that it is feasible to determine blasting hole arrangement parameters through combination of theoretical calculation and numerical simulation.

Description

technical field [0001] The invention relates to the field of tunnel excavation and blasting, in particular to a method for determining the positions of undercut holes and hollow holes based on numerical simulation technology to improve blasting effect. Background technique [0002] Blasting is a technology that uses the compression, loosening, destruction, throwing and killing effects produced by the explosion of explosives in air, water, soil and rock media or objects to achieve the expected purpose. When the earth-rock medium or structure is compressed, deformed, damaged, loosened and thrown, it is mainly used for earth-rock engineering and the demolition of buildings (structures). The scope of research includes: the properties and use methods of explosives and detonating equipment, the explosive effect of charges (packs) in various media, the contact blasting and non-contact blasting of charges on targets, the organization and implementation of various blasting operations...

Claims

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Application Information

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IPC IPC(8): G06F30/23G06F30/13E21D9/00G06F111/10
CPCG06F30/23G06F30/13E21D9/006G06F2111/10
Inventor 李兴全蒋新闻王建国李祥龙王云东甘会莲马军陶家龙陈志伟郑扬雷露刚周青莲李洪超姚永鑫张志平
Owner 云南交投公路建设第六工程有限公司
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