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Stress relief blasting method based on tunnel face notching

A technology of stress relief and tunnel face, applied in the field of geotechnical engineering, to achieve the effect of increasing energy release rate, improving effect and broad application prospect

Active Publication Date: 2015-03-04
WUHAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, the traditional grooving and stress relief blasting methods still have a lot of room for improvement

Method used

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  • Stress relief blasting method based on tunnel face notching
  • Stress relief blasting method based on tunnel face notching
  • Stress relief blasting method based on tunnel face notching

Examples

Experimental program
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Effect test

Embodiment 1

[0027] This embodiment takes a certain circular palm face as an example.

[0028] Firstly, the major principal stress σ of the tunnel cross section is obtained through exploration and geological data 1 direction and minor principal stress σ 3 According to the magnitude and direction of the ground stress, the original blasting sequence of the excavation blasting network is rearranged, so that the blasting network forms a slotting form approximately perpendicular to the direction of the major principal stress. Such as figure 1 In the middle MS5 section, the connection line of the blastholes in this section is approximately perpendicular to the direction of the major principal stress, and the strain energy can be released more fully during blasting. In addition, the holes are drilled according to the process of gradually decreasing blast hole depth from the inside to the outside, that is, from the cut hole to the light blast hole, such as figure 2 The middle is the A-A cross-...

Embodiment 2

[0032] In this embodiment, the tunnel face of a city gate is taken as an example.

[0033] Firstly, the major principal stress σ of the tunnel cross section is obtained through exploration and geological data 1 direction and minor principal stress σ 3 According to the magnitude and direction of the ground stress, the order of the excavation and blasting network is rearranged, so that the blasting network forms a grooving form approximately perpendicular to the direction of the major principal stress. Such as image 3 In the middle MS5 section, the connection line of the blastholes in this section is approximately perpendicular to the direction of the major principal stress, and the strain energy can be released more fully during blasting. In addition, the holes are drilled according to the process of gradually decreasing blast hole depth from the inside to the outside, that is, from the cut hole to the light blast hole, such as Figure 4 The middle is the blast hole B in th...

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Abstract

The invention discloses a stress relief blasting method based on a tunnel face notching. The method has the advantages that on the basis of a traditional notching blasting method and a traditional stress relief blasting method, the single hole arrangement is not needed, original tunneling blasting holes are subject to proper re-arrangement and deepening, and a tunnel face with an elliptical surface and an arc-shaped blasting and loosening area are blasted, so a new construction technology is formed, namely that the stress relief and the tunneling excavation are synchronously performed, and strain energy stored by surrounding rock self is sufficiently utilized; the method can be widely applied to the deep tunnel excavation in the fields of mines, water conservancy and hydropower, transportation and the like under the high ground stress condition, or the active control on strong rock blasting in the deep mining process, the rock blasting control effect is effectively improved, and the application prospect is broad.

Description

technical field [0001] The invention relates to the technical field of geotechnical engineering, in particular to a stress-relieving blasting method based on tunnel face grooving. Background technique [0002] Rockburst is a severe dynamic damage phenomenon that occurs in the surrounding rock during the excavation of deep underground caverns or deep mining in the fields of water conservancy and hydropower projects, mines, transportation, etc. Accompanied by the sudden release of the strain energy of the compressed rock, it is often a dynamic phenomenon manifested in the form of rock slice ejection, massive rock collapse or mine shock. [0003] Because rockbursts are very harmful, many scholars at home and abroad have done a lot of research on them since the 1960s. In general, there are two types of methods used: one is to control the shape of the blast hole, and the other is to adjust the structure of the charge. On this basis, the notch blasting technology also emerged as ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F42D3/04F42D1/00
Inventor 严鹏谢良涛卢文波陈明王高辉
Owner WUHAN UNIV
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