Construction method for super-large-span tunnel on basis of benching tunneling CD method

A construction method and step technology, which can be used in tunnels, tunnel linings, and earth-moving drilling and mining, etc., can solve the problems of instability, collapse, and self-stabilization of the excavation face.

Inactive Publication Date: 2018-06-08
CHANGAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Aiming at the above-mentioned technical problems, the present invention provides a construction method of super-long-span tunnel upper step CD method to solve the poor surrounding rock conditions (one-time excavation for both the leading pilot pit and the trailing ...

Method used

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  • Construction method for super-large-span tunnel on basis of benching tunneling CD method
  • Construction method for super-large-span tunnel on basis of benching tunneling CD method

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Embodiment 1

[0036] This embodiment provides a construction method of the step-up CD method for super-long-span tunnels. In view of the poor stability of the surrounding rock of super-long-span tunnels, by increasing the number of steps of the leading pilot pit and the trailing pilot pit in the step-up CD method, the traditional The step-up CD method was improved to avoid problems such as face instability and collapse caused by the high excavation height of the first pilot pit and the latter pilot pit. The schematic diagram of the step-up CD method after improvement is as follows: figure 1 shown. The specific process after the improvement of the construction method is as follows:

[0037] ①Excavation of the upper step 2-1 of the leading pilot pit: the height of the upper step of the leading pilot pit is 3-5m, and the length of the step is 5-10m;

[0038] ②The initial support of the upper step of the pilot pit is 2-2, and the temporary support of the middle wall of the upper step of the p...

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Abstract

The invention belongs to the technical field of tunnel engineering, and particularly relates to a construction method for a super-large-span tunnel on the basis of a benching tunneling CD method. According to the method, on the basis of the traditional benching tunneling CD method, early heading and later heading are both adjusted into two-step excavation by increasing the number of steps of earlyheading and later heading in the benching tunneling CD method, and therefore the situation is avoided that during the construction of the super-large-span tunnel on the basis of the benching tunneling CD method, since the one-time excavation height in early heading and later heading is too high, a tunnel face loses stability and collapses.

Description

technical field [0001] The invention belongs to the technical field of tunnel engineering, and in particular relates to a CD method construction method for upper steps of super-long-span tunnels. Background technique [0002] The step-up CD method is a tunnel construction method that takes into account the respective advantages of the traditional CD method and the step method. On the one hand, it can reduce the excavation span of the tunnel and effectively control the settlement of the arch. The number of disturbances is also less, and the construction speed is relatively fast. In recent years, it has been widely used in the tunnel construction of the upper soft and lower hard strata and the deep buried section of V-level surrounding rock, and it is mainly used in large-span or medium-span tunnels with excavation spans within 15m. With the increasing number of ultra-long-span tunnel projects such as single-hole four-lane highway tunnels in my country, the step-up CD method ...

Claims

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Application Information

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IPC IPC(8): E21D9/00E21D11/00
CPCE21D9/00E21D11/003
Inventor 陈建勋陈丽俊罗彦斌
Owner CHANGAN UNIV
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