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A wedge-shaped cutting blasthole layout method suitable for blasting excavation of deep-buried tunnels

A technology of wedge-shaped cutting and layout method, which is applied in blasting, tunneling, earthwork drilling and mining, etc. It can solve problems such as difficult throwing of blasting slag, poor cutting effect, and insufficient rock mass crushing, so as to reduce the amount of explosives and improve The effect of the gouging effect

Active Publication Date: 2021-07-13
NANCHANG UNIV
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  • Claims
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Problems solved by technology

[0004] The purpose of the present invention is to provide a method for arranging wedge-shaped blastholes suitable for blasting and excavation of deep-buried tunnels, so as to solve the problem that existing wedge-shaped cutting blasting methods do not consider the influence of ground stress on blasting and cracking of rock mass, resulting in rock mass fragmentation Insufficient, the blasting slag is not easy to throw out, and the cutting effect is poor

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  • A wedge-shaped cutting blasthole layout method suitable for blasting excavation of deep-buried tunnels
  • A wedge-shaped cutting blasthole layout method suitable for blasting excavation of deep-buried tunnels
  • A wedge-shaped cutting blasthole layout method suitable for blasting excavation of deep-buried tunnels

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[0029] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

[0030] The purpose of the present invention is to provide a method for arranging wedge-shaped blastholes suitable for blasting and excavation of deep-buried tunnels, so as to solve the problem that existing wedge-shaped cutting blasting methods do not consider the influence of ground stress on blasting and cracking of rock mass, resulting in rock mass fragmentation Insufficient, the blasting slag is not easy to throw out, and the cutting effect is poor.

[003...

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Abstract

The invention discloses a method for arranging wedge-shaped cutting blastholes suitable for blasting and excavation of deep-buried tunnels. Determine the direction of the maximum principal stress on the excavation face based on the distribution of body cracks; determine the layout of the blasting holes for wedge-shaped cutting blasting according to the direction of the maximum principal stress. The present invention arranges wedge-shaped cutting blasting holes in the direction of the maximum principal stress on the excavation face, which is beneficial to the expansion and breaking of cracks in the rock mass, reduces the amount of explosives used for cutting blasting, improves the cutting effect, and ensures The designed tunnel excavation cycle footage is obtained.

Description

technical field [0001] The invention relates to the technical field of deep rock mass blasting, in particular to a method for arranging wedge-shaped cutting blastholes suitable for blasting and excavation of deeply buried tunnels. Background technique [0002] At present, the excavation of deep tunnels in hydropower, transportation, mining and other engineering fields is becoming more and more frequent, and the drilling and blasting method is the main method for rock mass excavation of deep tunnels. During the blasting and excavation of underground tunnels, the blastholes arranged on the excavation face are often divided into three categories: cut holes, caving holes and peripheral holes according to the different working principles, layout methods and related parameters. The cut hole is the first blast hole on the excavation face. The cut hole first blasts a cavity on the excavation face to create a new free surface for the blasting of the subsequent blast hole. Therefore,...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F42D1/00F42D3/04E21D9/00
CPCE21D9/006F42D1/00F42D3/04
Inventor 杨建华孙文彬代金豪姚池张小波姜清辉
Owner NANCHANG UNIV
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