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Smoothwall blasting method for digging tunnel

A technology of smooth blasting and tunneling, applied in the field of blasting, which can solve the problems of large damage and disturbance of rock mass, increase of engineering cost, over-excavation, etc., and achieve the effects of saving excavation costs, simple and economical construction, and beneficial to over-excavation

Active Publication Date: 2012-11-07
胡铭益
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Problems solved by technology

However, due to the need to maintain good stability of the surrounding rock when excavating the tunnel, the traditional blasting technology is difficult to control the blasting intensity, and the degree of disturbance to the rock mass is large, which is not conducive to the stable support after the tunnel. Regularity often causes accidents such as over-excavation, under-excavation, and even landslides during tunnel excavation, resulting in increased engineering costs and a huge waste of human and material resources

Method used

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Embodiment Construction

[0023] In order to make the technical means, creative features, goals and effects achieved by the present invention easy to understand, the present invention will be further described below in conjunction with specific illustrations.

[0024] Excavate a tunnel with an arch height of 5.5 meters, drill in front of the eyes, the surveyors use a total station to accurately determine the center line of the tunnel and the elevation of the vault surface, in order to achieve the best blasting effect, first mark the blasting point 1 on the rock to be excavated, mark The method is: the first layer of the rock is the center layer of the rock, the center layer marks a central blasting point, draws concentric circles with the center blasting point as the center, marks the blasting point 1 on the semicircular arch circle of the ninth layer of the rock, and the same The distance of each blasting point 1 on the arch circle is 35cm, it can be calculated that 45 blasting points are needed, mark ...

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Abstract

The invention discloses a smoothwall blasting method for digging a tunnel. The method includes the basic processes of marking the shot point, digging and drilling holes, installing the blasting devices, connecting all the blasting devices through detonating fuses, connecting a millsecond detanator and an electric detonator, and finally detonating through a blaster. The method solves the problem of big damage to the wall rocks in the process of digging and blasting the tunnel and is particularly good for controlling over-excavation and under-excavation. The method saves the digging cost and atthe same time makes the late support construction of the tunnel simpler and more economic.

Description

technical field [0001] The invention relates to a blasting method, in particular to a smooth blasting method which causes little damage to surrounding rock during tunnel excavation. Background technique [0002] Blasting technology is an engineering technology that uses the energy of explosive explosion to destroy the original structure of a certain object, and realizes the explosive package arrangement and detonation method adopted for different engineering purposes. Because blasting technology can save a lot of manpower and material resources, it has been widely used in tunnel excavation. However, due to the need to maintain good stability of the surrounding rock when excavating the tunnel, the traditional blasting technology is difficult to control the blasting intensity, and the degree of disturbance to the rock mass is large, which is not conducive to the stable support after the tunnel. Regularity often causes accidents such as over-excavation, under-excavation, and e...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F42D3/04
Inventor 胡铭益
Owner 胡铭益
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