Advanced support structure for oversized variable-section tunnel

A technology of advanced support and variable cross-section, applied in tunnels, tunnel linings, wellbore linings, etc., can solve the problems of unguaranteed safety and too conservative parts, and achieve the effect of meeting stability requirements and overcoming stress defects.

Inactive Publication Date: 2015-04-08
CHINA RAILWAY SIYUAN SURVEY & DESIGN GRP
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Problems solved by technology

For ultra-large-span tunnels with a span of 20-30m in particularly weak surrounding rock, if one of the above-mentioned advanced support forms is simply adopted, it will go to extremes because different parts and different construction methods are not considered, or safety cannot be guaranteed. or some parts are too conservative

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  • Advanced support structure for oversized variable-section tunnel

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Embodiment Construction

[0013] The present invention will be further described below in conjunction with accompanying drawing of description and specific embodiment:

[0014] The present invention provides an advanced support structure for super-large variable-section tunnels, which includes a tunnel section composed of a main tunnel 1 to be excavated and a side tunnel 2 to be excavated. The side tunnel 2 to be excavated is located at the main tunnel 1 to be excavated. Two layers of high-pressure horizontal jet grouting piles 3 arranged along the longitudinal direction of the tunnel are arranged in the surrounding rock at the vault of the main cave 1 to be excavated along the tunnel excavation contour line. The advanced long pipe shed 4 arranged along the longitudinal direction of the tunnel, the surrounding rock at the vault of the side hole 2 to be excavated is arranged along the outside of the excavation contour of the tunnel, and a layer of high-pressure horizontal jet grouting piles 3 arranged al...

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Abstract

The invention provides an advanced support structure for an oversized variable-section tunnel. A main hole to be excavated and side holes to be excavated form a tunnel section; the side holes to be excavated are positioned in both sides of the main hole to be excavated; two layers of high-pressure horizontal jet grouting piles are arranged outside a tunnel excavation contour line on the arch crown of the main hole to be excavated; an advanced long pipe shed is embedded between the two layers of jet grouting piles; a layer of high-pressure horizontal jet grouting piles is arranged outside the tunnel excavation contour line on the arch crowns of the side holes to be excavated; a plurality of high-pressure horizontal jet grouting piles are arranged outside the tunnel excavation contour line on an arch foot between the side holes to be excavated and the main hole to be excavated; a plurality of high-pressure horizontal jet grouting piles are arranged on the tunnel face arch of the main hole to be excavated along a tunnel excavation direction. By adopting the advanced support structure, safety during excavation of the oversized variable-section tunnel in particularly-weak surrounding rock is ensured, the use of temporary supports is reduced, the degree of freedom in operation is increased, and the construction progress is accelerated.

Description

technical field [0001] The invention relates to the field of mountain tunnel construction, in particular to an advanced support structure for super-large variable-section tunnels. Background technique [0002] During tunnel construction, if the surrounding rock is completely unable to self-stabilize, construction is impossible. The self-stabilizing time is related to the nature of the surrounding rock and the span of one excavation of the tunnel. The worse the surrounding rock, the larger the span of one excavation and the shorter the self-stabilizing time, so that there is not enough time for support construction after excavation. Advance support was developed to solve this problem. According to the conditions of geological engineering environment, tunnel excavation section and construction method, there are many different forms of advanced support, including advanced pipe shed, shotcrete on the face of the face (front shotcrete), anchor rod on the face of the face (front ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21D11/10E21D21/00
CPCE21D11/10E21D21/00
Inventor 江胜林龚彦峰徐向东李树鹏张俊儒焦齐柱隗建波颜志伟孙文昊郭海满洪军陈利杰
Owner CHINA RAILWAY SIYUAN SURVEY & DESIGN GRP
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