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Method for supporting expressway tunnel in permafrost region

A technology for highways and tunnels, applied in tunnels, earthwork drilling, tunnel lining, etc., can solve the problems of difficult support methods to prevent water seepage, unstable overall performance, and large temperature difference between day and night, so as to reduce the probability of self-collapse and improve the overall The effect of stable performance, low water permeability and porosity

Pending Publication Date: 2022-06-03
QINGHAI UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] The Kunlun Mountain Tunnel of the Qinghai-Tibet Railway is located in the alpine and permafrost region of the plateau. The Qinghai-Tibet Plateau is high in altitude and has a large temperature difference between day and night. The conventional support method is difficult to achieve the purpose of preventing water seepage. At the same time, with the increase of the service life, the displacement between the structures in the tunnel is also gradually increasing. The overall performance is not stable enough, and it is prone to collapse.

Method used

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  • Method for supporting expressway tunnel in permafrost region

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Embodiment 1

[0019] A method for supporting highway tunnels in permafrost regions, comprising the following steps:

[0020] S1. Use the excavator to excavate the surrounding rock on the upper steps of the tunnel, excavate the corners with artificial air picks, and use the excavator to clean up the excavated slag. After excavation, measure the length and width of the excavation, and then Install curved steel plates at the excavation area for initial support;

[0021] S2. Drill holes on the tunnel vault, the diameter of which is greater than 14mm of the diameter of the advanced small conduit, and then erect the advanced small conduit along the excavated tunnel vault, and install a bracket between the advanced small conduit and the hole for the purpose of Tighten the advanced small duct, and then inject concrete A into the advanced small duct for reinforcement;

[0022] S3. Excavate the upper steps in the tunnel, manually erect arc-shaped brackets on the upper steps, lay out the anchor rod i...

Embodiment 2

[0032] A method for supporting highway tunnels in permafrost regions, comprising the following steps:

[0033] S1. Use the excavator to excavate the surrounding rock on the upper steps of the tunnel, excavate the corners with artificial air picks, and use the excavator to clean up the excavated slag. After excavation, measure the length and width of the excavation, and then Install curved steel plates at the excavation area for initial support;

[0034] S2. Drill holes on the tunnel vault, the diameter of which is greater than 17mm of the diameter of the advanced small conduit, and then erect the advanced small conduit along the excavated tunnel vault, and install brackets between the advanced small conduit and the hole for the purpose of Tighten the advanced small duct, and then inject concrete A into the advanced small duct for reinforcement;

[0035] S3. Excavate the upper steps in the tunnel, manually erect arc-shaped brackets on the upper steps, lay out the anchor rod in...

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Abstract

The invention relates to the technical field of tunnel supporting, and discloses a method for supporting an expressway tunnel in a permafrost region, which comprises the following steps of: S1, excavating surrounding rock of an upper step in a tunnel through an excavator, excavating corners through a manual air pick, cleaning excavated muck through the excavator, measuring the excavation length and width after excavation, and measuring the excavation length and width; then, an arc-shaped steel plate is installed in the excavation area for primary supporting; and S2, a hole is drilled in the tunnel vault, the hole diameter is 12-18 mm larger than the pipe diameter of the advanced small pipe, then the advanced small pipe is erected along the excavated tunnel vault, and a support is installed between the advanced small pipe and the hole and used for locking the advanced small pipe. According to the expressway tunnel supporting method, disturbance of anchor rod drilling on undisturbed frozen soil is avoided, stability of surrounding rock is facilitated, along with the increase of the service life, the displacement amount among all structures is low, the overall performance is more stable, the expressway tunnel supporting method can be normally used in severe weather, and the collapse probability of the expressway tunnel supporting method is reduced.

Description

technical field [0001] The invention relates to the technical field of tunnel support, in particular to a method for supporting highway tunnels in permafrost regions. Background technique [0002] The Kunlun Mountain Tunnel of the Qinghai-Tibet Railway is located in the plateau alpine permafrost area. The Qinghai-Tibet Plateau is high in altitude and has a large temperature difference between day and night. Some areas are in a frozen state all the year round, and freeze-thaw changes frequently. Due to the irregular operation of the highway tunnel construction, the permafrost will be aggravated. It is difficult for conventional support methods to prevent water seepage. At the same time, with the increase of service life, the displacement between the structures in the tunnel gradually increases, the overall performance is not stable enough, and it is prone to collapse. Therefore, those skilled in the art provide a method for supporting highway tunnels in permafrost areas to so...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21D11/10E21D11/12E21D20/02
CPCE21D11/105E21D11/10E21D11/12E21D20/02
Inventor 王青志房建宏徐安花李积珍苏延桂周文俊张勤帅王晨威申鹏
Owner QINGHAI UNIVERSITY
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