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An Excavation Construction Method Applicable to Large-Section Tunnels in Fractured Zones of Rich Water Faults

A construction method and broken zone technology, applied in tunnels, tunnel linings, drainage, etc., can solve problems such as tunnel collapse

Active Publication Date: 2021-03-12
中电建路桥集团有限公司 +1
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Problems solved by technology

[0003] As far as the current tunnel excavation method is concerned, the CRD or double-side-wall pilot pit method is mainly used to construct the gushing tunnel. However, this method is not suitable for large-section tunnels with a large amount of soil and filled with groundwater. This method will lead to the collapse of the tunnel after construction

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  • An Excavation Construction Method Applicable to Large-Section Tunnels in Fractured Zones of Rich Water Faults
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  • An Excavation Construction Method Applicable to Large-Section Tunnels in Fractured Zones of Rich Water Faults

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Embodiment Construction

[0029] In order to make the technical problems, technical solutions and advantages to be solved by the present invention clearer, the following will describe in detail with reference to the drawings and specific embodiments.

[0030] The invention provides an excavation construction method suitable for a large-section tunnel in a water-rich fault fracture zone.

[0031] Such as figure 1 As shown, the method includes the following steps:

[0032] (1) Excavation I of the upper half section of the pilot tunnel on the right, and implement initial support 1 and temporary support 1a;

[0033] (2) Excavation II of the lower half section of the right pilot tunnel, construction of initial support 2 and temporary support 2a, construction of mortar bolts for the right pilot tunnel, base grouting small conduit and main tunnel I-beam 1b, pouring concrete 1c;

[0034] (3) Excavate III on the upper half of the left pilot tunnel, and implement initial support 3 and temporary support 3a;

...

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Abstract

The invention provides an excavation construction method suitable for a large-section tunnel in a water-rich fault fracture zone, and belongs to the technical field of tunnel excavation. This method excavates the upper half section of the right pilot tunnel, the lower half section of the right pilot tunnel, the upper half section of the left pilot tunnel, the lower half section of the left pilot tunnel, the upper middle step, the middle middle step, and the lower middle step. , then pouring inverted arch concrete, applying inverted arch backfill concrete, and finally pouring arch ring concrete to realize the excavation of large-section tunnels under complex hydrogeological conditions, effectively avoiding the construction of traditional CRD method or double-side pilot pit method under such conditions Excavation caused disasters such as water gushing, mud inrush, landslides, and large deformation of the tunnel. In the construction of large-section tunnels in water-rich fault fracture zones, it has the characteristics of low cost and easy construction, and has great advantages in precipitation and advanced geological detection. It is worthy of popularization and application.

Description

technical field [0001] The invention relates to the technical field of tunnel excavation, in particular to an excavation construction method suitable for large-section tunnels in water-rich fault fracture zones. Background technique [0002] Highway construction is being carried out on a large scale in our country, especially the construction of long-distance highways across provinces and cities is also in full swing, and our country is a country with a vast territory, many mountains, hills and plateaus. In areas with complex terrain such as mountains, tunnel construction is the most effective construction plan. In the process of tunnel construction, groundwater seepage is an important factor affecting the design, construction and operation of tunnel engineering. In areas with abundant groundwater, water seepage in tunnels has always been an extensive, pervasive and harmful problem. my country is one of the countries with the most serious tunnel water inrush disasters. The...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21D9/00E21D20/02E21D11/14E21D11/10E21D11/38E21F16/02
CPCE21D9/00E21D11/10E21D11/14E21D11/38E21D20/02E21F16/02
Inventor 成子桥高永涛张伟吕建华李康陈文何若夫侯定贵
Owner 中电建路桥集团有限公司
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