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

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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Example Embodiment

[0060] Example 1

[0061] Such as figure 1 As shown, the method of the present invention for the excavation of tiny steps suitable for large-section tunnels of grade IV-V surrounding rock includes the following steps:

[0062] Step 1: Set the cross-sectional area to 150m 2 The face of the high-speed railway large-section tunnel is divided into upper and lower steps. The height of the upper step is 6m and the height of the lower step is 7m. The geological sketch method, the geophysical method, the advanced drilling method or the rock drilling rig MWD geological borehole cloud map prediction One or more kinds of advanced geological predictions;

[0063] Step 2: According to the results of advanced geological prediction, the tunnel face within the full section of the tunnel is water-rich, broken hard rock, the tunnel face collapses and blocks, the surrounding rock is graded as grade IV, and the tunnel face is unsupported The stability is evaluated as unstable, which is A-1 category;

...

Example Embodiment

[0076] Example 2

[0077] A method for excavating tiny steps suitable for large-section tunnels of grade IV-V surrounding rock. The difference from Example 1 is that after the first step:

[0078] Step 2. According to the results of advanced geological prediction, the tunnel face within the full section of the tunnel is anhydrous and intact soft rock, the tunnel face is partially broken, the surrounding rock is graded as grade IV, and the tunnel face stability without support The evaluation is relatively stable, that is, B-1 category;

[0079] Step 3. According to the evaluation and classification results of the tunnel face stability, adopt a φ42 small pipe with a length of more than 5m for advance support, and partially spray concrete to seal the tunnel face, and re-evaluate the tunnel face stability, if not Meet the needs and continue to implement this step until the face is stable;

[0080] Step 4. After the face of the face is stabilized in the step 3, use the rock drilling rig t...

Example Embodiment

[0082] Example 3

[0083] A method for excavating tiny steps suitable for large-section tunnels of grade IV-V surrounding rock. The difference from Example 1 is that after the first step:

[0084] Step 2. According to the results of advanced geological prediction, the tunnel face within the full section of the tunnel is water-rich and intact soft rock. The tunnel face soft rock is deformed and partially lost. The surrounding rock is graded as grade IV, without supporting palm. The sub-face stability is evaluated as relatively stable, which is B-2;

[0085] Step 3. According to the evaluation and classification results of the stability of the tunnel face, a small pipe of φ42 with a length of more than 5m is used for advance support, the face of the tunnel is partially sealed by shotcreting and fiber anchors are set locally, and the tunnel face is evaluated again Face stability, if the needs are not met, continue to implement this step until the face is stable;

[0086] Step 4. After t...

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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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