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Blasting process for hard rock multi-arch tunnel

A multi-arch tunnel and hard technology, which is applied in the field of hard rock multi-arch tunnel blasting technology, can solve the problems of difficulty in meeting precision requirements, difficulty in on-site implementation, and weak operability, and achieve easy operation, reduced blasting disturbance, and engineering The effect of low cost

Pending Publication Date: 2021-12-21
四川省交通勘察设计研究院有限公司 +1
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Problems solved by technology

This type of scheme does have the effect of reducing blasting hazards, but it requires preliminary deduction and calculation, and it is difficult to implement on-site. It is also difficult to meet the accuracy requirements in actual construction. Moreover, with the deepening of excavation work, the deformation and even the deformation law of the surrounding rock of the tunnel face are also changing. Faced with sudden changes at any time, the scheme of optimizing blasting parameters has poor adaptability and weak operability

Method used

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  • Blasting process for hard rock multi-arch tunnel
  • Blasting process for hard rock multi-arch tunnel

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Embodiment Construction

[0044] In order to make the object, technical scheme and advantages of the present invention more clearly understood, below in conjunction with embodiment and appended figure 1 And attached figure 2 , to further describe the present invention in detail. The exemplary embodiments and descriptions of the present invention are only used to explain the present invention, and are not intended to limit the present invention.

[0045] A blasting process for a hard rock multi-arch tunnel, comprising the following steps:

[0046] A. Blasting, tunneling, and supporting the advance hole until the depth reaches X m;

[0047] B. Divide the face of the back hole vertically into P areas. Along the direction close to the front hole, each area is defined as 1# area, 2# area, 3# area...P# area, P≥3;

[0048] C. Blasting and excavating the 1# area until the depth reaches Y m, forming the 1# pilot pit, Y<X;

[0049] D. According to the increasing order of P value, successively blast and excav...

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Abstract

The invention relates to the technical field of tunnel construction, and discloses a blasting process of a hard rock multi-arch tunnel. According to the blasting process of the hard rock multi-arch tunnel from the optimization angle of the tunneling area and sequence of a tunnel face, the structure of surrounding rock is fully used, a support middle pilot tunnel does not need to be excavated, variable actual working conditions can be met, the precision requirement is low, and the operability is high. The blasting process can be widely applied to the construction process of the hard rock multi-arch tunnel, a working face and temporary supports are reduced, the tunnel is flexibly and conveniently excavated and supported, additional materials are not needed, the construction cost is reduced, integral blasting excavation can be performed after a stepped section is formed, the engineering progress is accelerated, and a great popularization value and wide application prospects are achieved.

Description

technical field [0001] The invention relates to the technical field of tunnel construction, in particular to a blasting process for hard rock multi-arch tunnels. Background technique [0002] With the rapid development of high-grade highway construction, the uplink and downlink tunnels of mountainous expressways are often restricted by terrain when selecting routes, so that the minimum clear distance between two adjacent tunnels cannot meet the requirements of design specifications. Under such circumstances, more and more attention has been paid to small-space tunnels and multiple-arch tunnels. However, the surrounding rock stability and supporting structure of small-space tunnels are more complex than ordinary separated tunnels and multiple-arch tunnels, so the ground Small, compact multi-arch tunnels are more and more widely used, especially in the construction of short and medium tunnels. [0003] The hazards of blasting vibration in tunnel rock excavation have always be...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21D9/00E21D11/00E21D11/10
CPCE21D9/006E21D11/00E21D11/10
Inventor 雷良张生张宁王建华严顺李良勇周威锦孙陈歆严明旺王吉平李辉忠赵昱龙范金海
Owner 四川省交通勘察设计研究院有限公司
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