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Full-circle excavation method suitable for ⅳ-Ⅴ grade surrounding rock of large-section tunnels

A large-section, tunnel technology, applied in the direction of tunnel, tunnel lining, earth-moving drilling and mining, etc., to reduce deformation, improve safety, and achieve remarkable effects

Active Publication Date: 2020-05-19
CHINA RAILWAY ERYUAN ENG GRP CO LTD +4
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0011] The purpose of the present invention is to overcome the disadvantages of the traditional manual partial excavation method existing in the prior art, and to provide a safe and fast excavation method suitable for large-section tunnel IV-V surrounding rock from the perspective of tunnel construction as a whole. , high-quality mechanized full-circle excavation method

Method used

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  • Full-circle excavation method suitable for ⅳ-Ⅴ grade surrounding rock of large-section tunnels
  • Full-circle excavation method suitable for ⅳ-Ⅴ grade surrounding rock of large-section tunnels
  • Full-circle excavation method suitable for ⅳ-Ⅴ grade surrounding rock of large-section tunnels

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Experimental program
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Effect test

Embodiment 1

[0060] like figure 1 As shown, a kind of full-circle excavation method suitable for large-section tunnel IV-V grade surrounding rock described in the present invention comprises the following steps:

[0061] Step 1, using one or more of geological sketching method, geophysical prospecting method, advanced drilling method or rock drill rig MWD geological drilling cloud image prediction to perform advanced geological prediction;

[0062] Step 2. According to the results of the advanced geological prediction, the tunnel face within the entire cross-section is water-rich and broken hard rock. The tunnel face collapses and blocks fall off. The surrounding rock is classified as Grade IV. The stability evaluation is unstable, that is, category A-1;

[0063] Step 3: According to the evaluation and classification results of the stability of the tunnel face, use a φ42 small conduit with a length greater than 5m for advanced support, partially seal the tunnel face with shotcrete and loc...

Embodiment 2

[0075] A full-circle excavation method suitable for large-section tunnel IV-V surrounding rock, the difference from Embodiment 1 is that after the first step:

[0076] Step 2. According to the results of the advanced geological prediction, the tunnel face within the entire cross-section is anhydrous and complete soft rock, the tunnel face is partially broken, the surrounding rock is classified as grade IV, and the tunnel face is stable without support. The evaluation is relatively stable, that is, category B-1;

[0077] Step 3: According to the evaluation and classification results of the stability of the tunnel face, use a φ42 small conduit with a length greater than 5m for advance support, and partially seal the face with shotcrete, and re-evaluate the stability of the face. Continue to implement this step until the face of the palm is stable;

[0078] Step 4: After the face of the face in step 3 is stabilized, use the rock drilling rig to drill holes in the full section of...

Embodiment 3

[0081] A full-circle excavation method suitable for large-section tunnel IV-V surrounding rock, the difference from Embodiment 1 is that after the first step:

[0082] Step 2. According to the results of the advanced geological prediction, the tunnel face within the entire tunnel section is water-rich and complete soft rock. The soft rock on the tunnel face is deformed and local blocks are lost. The surrounding rock is classified as Grade IV. The stability evaluation of the subsurface is relatively stable, which is B-2 category;

[0083] Step 3: According to the evaluation and classification results of the stability of the tunnel face, use a φ42 small conduit with a length greater than 5m for advance support, partially seal the tunnel face with shotcrete and place fiber anchors locally, and evaluate the tunnel again If the stability of the face is not met, continue to implement this step until the face of the face is stable;

[0084] Step 4: After the face of the face in step 3...

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Abstract

The invention discloses a full-ring excavation method suitable for IV-V level of surrounding rocks of a large-section tunnel. Advanced geologic prediction is implemented, the tunnel face stability isevaluated and classified in the full section range; whether to implement advanced support and tunnel face reinforcement is decided, and corresponding concrete measures are taken till the tunnel face is stable; a drill jumbo drills blast holes and fill an explosive in the full section of the tunnel face, and detonation is carried out in one step; ventilation, danger removing, under-excavation handling and slag removing are carried out on the tunnel face; the tunnel face after cyclic excavation is sketched geologically, the stability of the tunnel face is determined, a wet spraying manipulator sprays an early high-strength concrete preliminarily, and the tunnel face is enclosed; a system anchor pole is constructed; an arc centering installation trolley erects a steel frame and implements annular and vertical connection, and concrete is sprayed again to reach a design thickness; an inverted arc area of a present excavation cycle is back filled with hole slag, and work of next cycle is carried out; a movable inverted arch trestle is used to pour the inverted arc and sidewall with basic concrete; earthwork cloths and waterproof boards are laid, and lining steel bars of an arch wall arelashed; and the lining of the arch wall is poured and maintained.

Description

technical field [0001] The invention relates to the technical field of tunnel engineering construction, in particular to a full-circle excavation method suitable for large-section tunnel IV-V surrounding rock. Background technique [0002] Since the 21st century, my country's tunnel engineering technology has developed rapidly, benefiting from the rapid rise of high-speed railways in recent years. Tunnel engineering technology has become an important part of high-speed railway technology, especially in the construction of railways in the west, where tunnels account for a large proportion and often control the construction period of the entire project. For example, the Chengdu-Lanzhou Railway under construction has a total length of about 457km, of which 32 tunnels are about 332km in total, and the ratio of tunnel lines is about 72.6%. Up to 90% or more, just like a high-speed subway. By the end of 2015, more than 2,200 high-speed rail tunnels had been completed and opened ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21D9/00E21D11/10E21D20/00E21D20/02E21D11/38F42D3/04
CPCE21D9/00E21D9/001E21D9/006E21D11/10E21D11/107E21D11/38E21D20/00E21D20/02
Inventor 王志坚许佑顶唐可喻渝王明年刘科甘目飞杨友元金强国童建军刘雄伟李老三尚寒春王微嘉郦亚军王毅东李书兵王永太郭创科姜军田佳马留闯林三国
Owner CHINA RAILWAY ERYUAN ENG GRP CO LTD
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