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Reverse tunnel entering construction method for tunnel special-shaped protection arch on slope accumulation body

A construction method and tunnel technology, which is applied in tunnels, tunnel linings, excavations, etc., can solve problems such as cave entrances that are prone to collapse, and achieve the effects of reducing the amount of single excavation, ensuring construction safety, and reducing construction disturbances

Inactive Publication Date: 2020-10-02
ROAD & BRIDGE INT +1
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  • Summary
  • Abstract
  • Description
  • Claims
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Problems solved by technology

[0003] However, when the tunnel entrance section is located in unfavorable geology such as loose deposits and slope deposits, and is under unfavorable terrain conditions such as shallow burial, obvious bias pressure, steep mountains, and high upward slopes, if the conventional tunnel entry method is adopted, the mountain at the entrance of the tunnel will be It is very prone to collapse when it encounters water or construction disturbance, and there is a major safety risk

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  • Reverse tunnel entering construction method for tunnel special-shaped protection arch on slope accumulation body
  • Reverse tunnel entering construction method for tunnel special-shaped protection arch on slope accumulation body
  • Reverse tunnel entering construction method for tunnel special-shaped protection arch on slope accumulation body

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Embodiment Construction

[0023] The implementation of the present invention will be described below through specific embodiments in conjunction with the accompanying drawings.

[0024] In a specific embodiment of the present invention, the surrounding rock of the tunnel is fully-moderately weathered Mesoproterozoic sericite albite quartz schist, and the entrance section is a shallow buried tunnel. At the foot of the slope, the natural slope angle is about 28°. Before the tunnel construction, it was in a stable state. After the excavation of the foot of the slope, it is easy to lose stability, which has a certain impact on the stability of the uphill slope at the entrance of the tunnel.

[0025] In order to ensure safe entry into the tunnel during tunnel construction, the present invention is used to construct protective arches and enter into the tunnel. The construction process is as follows: figure 1 As shown, the specific method is as follows:

[0026] (1) Brush the slope around the mountain around...

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Abstract

The invention relates to a reverse tunnel entering construction method for a tunnel special-shaped protection arch on a slope accumulation body. The reverse tunnel entering construction method comprises the steps that the protection arch is divided into a front section and a rear section to be constructed in sequence, an upper section is constructed firstly for each section and then a lower section is constructed for each section; sectional and batched excavation and sectional and batched bottom falling are adopted for tunnel entering excavation, the single excavation amount is reduced as muchas possible, it is guaranteed that tunnel entering excavation is carried out under supporting of the protection arch and an advanced long pipe shed, and construction safety is guaranteed; and the structure of the protection arch is in a special shape, the heights of arch feet on the two sides are different, specifically, it is guaranteed that the arch feet fall on bedrock according to the elevation of the bedrock on site, the excavation amount is greatly reduced, construction disturbance to the slope accumulation body is reduced, the project amount of side slope and upward slope protection issaved, the construction cost can be reduced, and the construction period is shortened.

Description

technical field [0001] The invention belongs to the technical field of tunnel construction, and in particular relates to a reverse construction method for a special-shaped protective arch of a tunnel on a slope deposit. Background technique [0002] Tunnel construction is one of the key processes in tunnel construction, and its success directly affects the construction period of the entire tunnel project and the structural safety of the tunnel entrance. Conventional tunnels generally adopt the support measures of 2m long sleeve arch and advanced long pipe shed, and excavate into the hole according to the step method or the reserved core soil method. [0003] However, when the tunnel entrance section is located in unfavorable geology such as loose deposits and slope deposits, and is under unfavorable terrain conditions such as shallow burial, obvious bias pressure, steep mountains, and high upward slopes, if the conventional tunnel entry method is adopted, the mountain at the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21D9/00E21D11/18E21D11/14E21D11/10E02D17/20E02D29/055
CPCE02D17/20E02D29/055E21D9/00E21D11/10E21D11/14E21D11/18Y02A10/23
Inventor 章从旭董俭召刘永松章儒愿
Owner ROAD & BRIDGE INT
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