Medium-length hole blasting and cutting method in underground construction

A deep hole blasting and underground engineering technology, applied in blasting and other directions, can solve the problem of low blasting efficiency and achieve good blasting effect

Inactive Publication Date: 2014-10-15
HUAQIAO UNIVERSITY
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  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The main purpose of the present invention is to solve the technical key of cutting and blasting in underground engineering, overcome the problem of low blasting e...

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  • Medium-length hole blasting and cutting method in underground construction
  • Medium-length hole blasting and cutting method in underground construction
  • Medium-length hole blasting and cutting method in underground construction

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Embodiment Construction

[0023] The present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments.

[0024] The invention provides a deep hole blasting cutting method in underground engineering, the specific technical scheme is as follows:

[0025] The deep hole blasting in underground engineering adopts the straight hole cutting method. The continuous columnar charge of the cut blast hole 2 is divided into two parts, the upper columnar charge breaks the rock, forms a weak throw, and produces a blasting funnel, while the lower columnar charge produces a crushing and crushing effect, and only a very small amount of energy is used for the rock of the throw.

[0026] According to this, the spacing z of the blast hole 2 can be calculated by the following formula: z=φ(p 1 / p c ) 1 / β , where φ is the charge diameter; β is the attenuation index, μ is Poisson's ratio of rock; p 1 is the explosion pressure on the 2 wall of the cutting blast hol...

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Abstract

The invention relates to a medium-length hole blasting and cutting method in underground construction. In the underground construction, deep-hole blasting adopts parallel cutting, and continuous cylindrical explosive loading of cutting blast holes includes breaking rock by cylindrical explosive loading on the upper portion, and forming a weak throwing to generate a blasting crater; generating an extruding and crashing function by cylindrical explosive loading on the lower portion; drilling a hollow hole 200-300mm deeper than the cutting blast holes but equal in the diameter and the depth at the center of a cutting position, properly loading blasting-delayed explosives into the hollow hole, and enhancing slag throwing action. Both the medium-length hole blasting and cutting method and parameters thereof have theoretical basis and practicality, tunneling efficiency is greatly improved, tunneling cost is reduced, and considerable economic benefits are gained. The medium-length hole blasting and cutting method has excellent explosion effects in application in the underground construction such as mines and tunnels, and utilization rate of the cutting blast holes is higher than 90%.

Description

technical field [0001] The invention relates to the technical field of underground engineering blasting, and more specifically relates to a cutting method for deep hole blasting in underground engineering. Background technique [0002] Due to the small excavation section of the underground engineering, the narrow working space and the single free surface, the clamping effect of the blasting is relatively large, and the blasting is very difficult, especially the cutting blasting effect is poor. Therefore, the choice of cutting method and the calculation of its parameters are the main difficulties and keys in the blasting technology of underground engineering. Because there is no theoretical basis and field experience support for the selection of cutting methods in the past, people only choose cutting methods based on experience. As a result, the design often fails to meet the requirements. The average utilization rate of blasting holes is about 60%, which seriously affects U...

Claims

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Application Information

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IPC IPC(8): F42D1/00
Inventor 陈士海陈星欣吴建
Owner HUAQIAO UNIVERSITY
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