Large-span column-free underground tunnel structure and method based on advanced pilot tunnels and opposite-pulling anchor cables

A technology for pulling anchor cables and tunnels, applied to underground chambers, tunnels, tunnel linings, etc., can solve problems such as the inability to provide reference and guidance for this, and the inability to realize the requirements for large-span and column-free space use

Active Publication Date: 2022-04-12
CHINA RAILWAY LIUYUAN GRP CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, because the beam-column system cuts the cavern space, it cannot meet the requirement of using a large-span column-free space
Especially for column-free caverns with relatively small span, as the span increases in magnitude, traditional design methods and concepts such as "CRD method" and "New Austrian method" can no longer meet the design requirements, and cannot provide reference for this with guidance

Method used

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  • Large-span column-free underground tunnel structure and method based on advanced pilot tunnels and opposite-pulling anchor cables
  • Large-span column-free underground tunnel structure and method based on advanced pilot tunnels and opposite-pulling anchor cables
  • Large-span column-free underground tunnel structure and method based on advanced pilot tunnels and opposite-pulling anchor cables

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Embodiment 1: as Image 6 , Figure 7 As shown, a large-span column-free underground tunnel structure based on advanced pilot tunnels and opposite pull anchor cables, including underground tunnels 1, several advanced pilot tunnels, and several opposite pull anchor cables 3; wherein: the section of the underground tunnel 1 is Multi-arch form; the leading pilot tunnels respectively extend along the longitudinal axis of the underground tunnel, and several of the leading pilot tunnels are arranged horizontally side by side above the roof of the underground tunnel 1; the leading pilot tunnels respectively pass through several The anchor cable 3 is connected with at least one adjacent span intersection in the multi-arch structure of the underground tunnel 1 .

[0026] Specifically, such as Image 6 As shown, in the long-span column-free underground tunnel structure described in Example 1, in order to avoid the surrounding rock disturbance during the excavation process as mu...

Embodiment 2

[0028] Embodiment 2: as Figures 6 to 7 As shown, a large-span column-free underground tunnel structure based on advanced pilot tunnels and paired anchor cables differs from Embodiment 1 in that as a preference, among several paired anchor cables 3 connected to each advanced pilot tunnel, The distance between each group of paired anchor cables arranged at equal intervals in the longitudinal direction is set to 4-8m; according to the span of the single hole and the stratum conditions, in each group of paired anchor cables, the length of the anchor rod is set to 15-35m, and the preload is 1000kN~2000kN.

[0029] The formation conditions applicable to the large-span column-free underground tunnel structure described in Embodiments 1 and 2 of the present invention are: II-IV hard rock formations with static lateral pressure coefficients of 1-3.

[0030] In the large-span column-free underground tunnel structure described in Embodiments 1 and 2 of the present invention, the overal...

Embodiment 3

[0031] Embodiment 3: as Figures 1 to 7 As shown, a method for constructing a large-span column-free underground tunnel structure described in Embodiment 1 and Embodiment 2. The present invention takes the six-arch structure of an underground tunnel as an example. The design span of the tunnel is 60m, and there are six tunnel spans, each The span of each cavern is 10m, the maximum design height of the cavern span is 13.5m, the rise-span ratio is 0.23, and the longitudinal length is 105m; the geological conditions are: no confined water, in the IV grade granite formation, the lateral pressure coefficient is 3.0, the scope of the cavern There are 5 penetrating fissures in the interior, which are perpendicular to the axis of the cavern, and the inclination angle of the fissures is 60°-90°, all of which are steep angle fissures;

[0032] The specific construction steps are as follows:

[0033] like figure 1Shown: S1, construction of the first lead tunnel 21; S2, at least 10m be...

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PUM

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Abstract

The invention relates to a large-span column-free underground tunnel structure and method based on advance pilot tunnels and opposite-pulling anchor cables. The large-span column-free underground tunnel structure comprises an underground tunnel, a plurality of advance pilot tunnels and a plurality of opposite-pulling anchor cables. Wherein the section of the underground tunnel is in a multi-arch mode, the leading pilot tunnels extend in the longitudinal axis direction of the underground tunnel, and the multiple leading pilot tunnels are arranged above the tunnel top of the underground tunnel in a transverse parallel arrangement mode; the leading pilot tunnels are connected with the intersection of at least one adjacent tunnel span in the multi-arch structure of the underground tunnel through a plurality of opposite-pulling anchor cables. According to the large-span column-free underground tunnel structure, the large-span column-free space effect of an underground tunnel is achieved through the advance pilot tunnels and the opposite-pull anchor cables, in the construction process, safe and efficient construction is achieved through the construction steps of advance excavation of the advance pilot tunnels, step-by-step blasting of rock mass of all the tunnel spans and step-by-step driving of the opposite-pull anchor cables in sequence, and the construction efficiency is improved. And the span of the underground tunnel can reach more than 30m.

Description

technical field [0001] The invention relates to the field of underground engineering, in particular to a large-span column-free underground tunnel structure and a construction method based on an advanced pilot tunnel and opposite-tensioned anchor cables. Background technique [0002] In order to meet the growing demand for underground space, more and more underground oil storage depots, underground tunnels, main workshops of hydropower stations, large-span caverns, and large-span highway and railway tunnels are being constructed. However, there are insufficient research and engineering experience for large-span column-free underground tunnels at present. The maximum span of long-span column-free underground tunnels is restricted by many conditions, and further research is needed on the stratum conditions applicable to them. According to the existing design concept and civil construction technology, the maximum span that can be realized for a single underground excavation is ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21D9/14E21D11/00
CPCY02E10/20
Inventor 喻敏贺维国陈翰刘鹏费曼利吴昊吕显福郑阳毕丽平郑佳秀
Owner CHINA RAILWAY LIUYUAN GRP CO LTD
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