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Tunnel Construction Method in Karst Section of Weak Surrounding Rock

A technology for weak surrounding rock and tunnel construction, applied in tunnels, tunnel linings, earthwork drilling and mining, etc., to achieve good bearing capacity, good technical benefits, and simple erection.

Active Publication Date: 2021-03-30
ZHEJIANG UNIV CITY COLLEGE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, there are no relevant patents on how to deal with tunnels passing through unfilled small karst caves, deep karst caves under the tunnel floor, watery karst caves, and large karst caves

Method used

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  • Tunnel Construction Method in Karst Section of Weak Surrounding Rock
  • Tunnel Construction Method in Karst Section of Weak Surrounding Rock
  • Tunnel Construction Method in Karst Section of Weak Surrounding Rock

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Embodiment Construction

[0049] The present invention will be further described below in conjunction with the examples. The description of the following examples is provided only to aid the understanding of the present invention. It should be pointed out that for those skilled in the art, without departing from the principle of the present invention, some improvements and modifications can be made to the present invention, and these improvements and modifications also fall within the protection scope of the claims of the present invention.

[0050] The tunnel construction method of the weak surrounding rock karst section includes the following steps:

[0051] (1) Carry out measurement and stakeout according to the advanced geological forecast.

[0052] (2), advanced support. Use support bolt 2 and advance grouting small conduit for temporary support.

[0053] (3), circular excavation on the upper steps. Use artificial picks and long-arm excavators for excavation, side-turning excavators for slag l...

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Abstract

The invention relates to a construction method of a tunnel in a karst section of soft surrounding rock. The construction method of the tunnel in the karst section of soft surrounding rock comprises the steps of 1, measuring and lofting; 2, carrying out forepoling; 3, starting to annularly excavate upper steps; 4, carrying out early support on the upper steps; 5, starting to excavate core soil of the upper steps; 6, starting to excavate left lower steps and right lower steps simultaneously; 7, adopting a tunnel through non-filling small-sized karst cave treatment structure to treat a non-filling small-sized karst cave; 8, carrying out early support on the left lower steps and on the right lower steps at the same time; 9, starting to excavate an inverted arch and carrying out early support on the inverted arch; 10, carrying out second lining on the inverted arch and on an arch wall; 11, adopting an under tunnel floor deep-buried karst cave treatment structure to treat a deep-buried karstcave; 12, adopting an under tunnel floor water karst cave treatment structure to treat a water karst cave; 13, adopting an under tunnel floor large karst cave treatment structure to treat a large karst cave; and 14, carrying out construction on a tunnel floor. The construction method of the tunnel in the karst section of soft surrounding rock has the beneficial effects that a dismantling-free template used in the construction method does not need to be dismantled after concrete is poured, the number of construction steps is reduced, and construction time is shortened.

Description

technical field [0001] The invention relates to the field of tunnel engineering, in particular to a tunnel construction method in a karst section of weak surrounding rock. Background technique [0002] my country's karst geology is mainly distributed in the three provinces of Yunnan, Guizhou and Sichuan, Guangdong, Guangxi and some areas of Lianghu. Projects are being planned and constructed one after another, and a large number of engineering problems caused by karst geology, especially karst tunnel engineering problems, need to be dealt with. Due to the improvement of railway design standards, long-term and deep-buried karst tunnels are inevitable due to the limitation of longitudinal slope and curve radius of the line. At the same time, due to the limitation of survey techniques, survey cycle and the irregularity of karst development itself, it is difficult to completely find out the specific karst form of the tunnel passing through the section during the survey and desig...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21D9/00E21D9/12E21D11/10E21D11/15E21D11/38E21D20/00E21F16/02
CPCE21D9/003E21D9/12E21D11/102E21D11/105E21D11/107E21D11/152E21D11/38E21D20/00E21F16/02
Inventor 王新泉刁红国税伟谢勇华国睿
Owner ZHEJIANG UNIV CITY COLLEGE
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