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Mini step excavation method suitable for IV-V level of surrounding rocks of large-section tunnel

A technology of step excavation and large cross-section, which is applied in tunnels, tunnel linings, earthwork drilling and mining, etc., to achieve the effects of reducing loads, preventing landslides, and reducing the scope

Inactive Publication Date: 2019-01-15
武九铁路客运专线湖北有限责任公司 +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 micro-step excavation method

Method used

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  • Mini step excavation method suitable for IV-V level of surrounding rocks of large-section tunnel
  • Mini step excavation method suitable for IV-V level of surrounding rocks of large-section tunnel
  • Mini step excavation method suitable for IV-V level of surrounding rocks of large-section tunnel

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Experimental program
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Effect test

Embodiment 1

[0061] Such as figure 1 As shown, a kind of micro-step excavation method suitable for large-section tunnel IV-V grade surrounding rock described in the present invention comprises the following steps:

[0062] Step 1, set the cross-sectional area to 150m 2 The face of a large-section high-speed railway tunnel is divided into upper and lower steps, of which the height of the upper step is 6m and the height of the lower step is 7m. The geological sketch method, geophysical prospecting method, advanced drilling method or MWD geological drilling cloud image prediction of rock drilling rigs are used One or more types for advanced geological prediction;

[0063] 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;

[0064] St...

Embodiment 2

[0077] A micro-step excavation method suitable for large-section tunnel IV-V surrounding rock, the difference from Example 1 is that after the first step:

[0078] 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;

[0079] 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;

[0080] Step 4: After the face of the tunnel in Step 3 is stabilized, use a rock drilling jumbo to drill and charge the blasthole within ...

Embodiment 3

[0083] A micro-step excavation method suitable for large-section tunnel IV-V surrounding rock, the difference from Example 1 is that after the first step:

[0084] 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;

[0085] 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 locally install fiber anchors, 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;

[0086] Step 4: After the face of the tunnel in Ste...

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Abstract

The invention discloses a mini step excavation method suitable for IV-V level of surrounding rocks of a large-section tunnel. A tunnel face is divided into upper and lower steps, the height of the lower step ranges from 5m to 8m, and advanced geologic prediction is implemented; the tunnel face stability is evaluated and classified; whether to implement advanced support and tunnel face reinforcement is decided, and a processing method is used till the tunnel face is stable; a drill jumbo drills blast holes and fill an explosive in the full section of the tunnel face, whole detonation is carriedout, and the vertical length difference between the upper and lower steps ranges from 3m to 5m; ventilation, danger removing, under-excavation handling and slag removing are carried out on the tunnelface; the tunnel face after 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; 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 are lashed; 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 micro-step excavation method suitable for IV-V surrounding rocks of large-section tunnels. 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 ope...

Claims

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Application Information

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IPC IPC(8): E21D9/00E21D11/10E21D20/00E21D20/02E21D11/38F42D3/04
Inventor 许佑顶王志坚喻渝唐可王明年刘科甘目飞杨友元金强国童建军李老三刘雄伟王微嘉尚寒春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 武九铁路客运专线湖北有限责任公司
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