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Tunnel weak surrounding rock pre-splitting blasting construction method

A construction method and technology for weak surrounding rocks, applied in blasting and other directions, can solve problems such as difficulty in controlling the amount of charge, poor integrity of surrounding rocks, and falling blocks of surrounding rocks, so as to reduce drilling workload, improve construction progress, and prevent under-excavation The effect of volume reduction

Pending Publication Date: 2020-10-09
GUANGDONG GUANYUE HIGHWAY & BRIDGE
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AI Technical Summary

Problems solved by technology

Due to the weak surrounding rock of the tunnel, due to the poor integrity of the surrounding rock, it is difficult to control the amount of charge by smooth blasting, and the disturbance of the blasting will cause serious fragmentation of the surrounding rock, resulting in over-under-excavation

Method used

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Embodiment Construction

[0023] In order to facilitate the understanding of those skilled in the art, the present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0024] This embodiment is applied to the excavation construction of the Pingwu Tunnel. The quality of the surrounding rock of the Pingwu Tunnel is Ⅳ-Ⅴ, and the rock firmness coefficient is 2-6.

[0025] The construction method of the tunnel weak surrounding rock pre-splitting blasting comprises the following steps:

[0026] 1) Drill blastholes on the face of the shaft, including pre-split holes, peripheral holes, cut holes, and auxiliary holes. Such as figure 1 As shown, the pre-splitting holes are arranged circumferentially along the excavation contour line, the spacing is 50-60 cm, and the minimum resistance line is 60 cm. The peripheral eyes are arranged in a row near the pre-split eyes in the main explosion area, with a distance of 50 cm. The cutting holes and the auxiliary hol...

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Abstract

The invention relates to a tunnel weak surrounding rock pre-splitting blasting construction method. The tunnel weak surrounding rock pre-splitting blasting construction method comprises the followingsteps that (1) blasting holes are formed in a tunnel face and include pre-splitting holes, peripheral holes, cut holes and auxiliary holes; (2) the blasting holes are filled with explosives; (3) the blasting holes are plugged; (4) detonating cords in the pre-splitting holes and a main detonating cord located outside the pre-splitting holes are bound and connected, the portions with the lengths larger than or equal to 10cm and at one end of the main detonating cord are connected with the main detonating cord through a same low-grade non-electric nonel detonator in the explosion propagation direction, and high-grade non-electric nonel detonators in the peripheral holes, the cut holes and the auxiliary holes and the low-grade non-electric nonel detonator are connected together in a clusteredmode; and (5) the low-grade non-electric nonel detonator is detonated through an electric detonator. By the adoption of the tunnel weak surrounding rock pre-splitting blasting construction method, thehole drilling workload is reduced, the over-break amount and the under-break amount are reduced, and the construction progress can be effectively improved. In addition, the disturbance to the surrounding rock is reduced, the blasting effect is improved, and the construction safety is ensured.

Description

technical field [0001] The invention relates to a tunnel excavation construction method, in particular to a construction method for pre-splitting blasting of weak surrounding rock of a tunnel. Background technique [0002] Smooth surface blasting is the blasting of the peripheral eye on the excavation contour line first and then the blasting hole last, which is widely used in the shallow hole blasting construction of soft rock and medium hard rock tunnels. Due to the weak surrounding rock of the tunnel, due to the poor integrity of the surrounding rock, it is difficult to control the amount of charge by smooth blasting, and the disturbance of the blasting will cause serious fragments of the surrounding rock, resulting in over- and under-excavation. Contents of the invention [0003] In view of the above problems, the present invention is proposed in order to provide a construction method for pre-splitting blasting of tunnel weak surrounding rocks which overcomes the above ...

Claims

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Application Information

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IPC IPC(8): F42D1/08F42D3/04
CPCF42D1/08F42D3/04
Inventor 付凯斌徐会超苏文卓彭思瑞谢海彬陈小丽
Owner GUANGDONG GUANYUE HIGHWAY & BRIDGE
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