Water-rich freeze-thaw broken surrounding rock tunnel supporting method

A technology for crushing surrounding rocks and tunnels, which is applied in the field of tunnel support in tunnels and underground structures, and can solve problems such as groundwater gushing out, tunnel construction difficulties, and tunnel temperature rise

Pending Publication Date: 2021-05-14
THE FIRST ENG CO LTD OF CTCE GRP +2
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] For tunnels with high altitude and low temperature, the underground water in the tunnel freezes. Due to the construction disturbance and the hydration heat of co...

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  • Water-rich freeze-thaw broken surrounding rock tunnel supporting method
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  • Water-rich freeze-thaw broken surrounding rock tunnel supporting method

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Embodiment Construction

[0025] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

[0026] See figure 1 and figure 2 , a kind of water-rich freeze-thaw broken surrounding rock tunnel support method specifically includes the following steps:

[0027] (1) For each construction cycle, advanced support is carried out at the water-rich freeze-thawed and broken surrounding rock above the tunnel excavation vault, that is, 42 advanced small conduits (length 4m) 1 are laid along the tunnel vault, and Carry out grouting reinforcement in the leading ...

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Abstract

The invention discloses a water-rich freeze-thaw broken surrounding rock tunnel supporting method. The method comprises the steps that firstly, advance supporting of advance small guide pipe grouting is conducted; secondly, after blasting excavation is conducted, arch crown sealing of a multi-section steel arch frame and an arc-shaped steel plate is conducted; and finally, grouting blocking between arch crown surrounding rock and the arc-shaped steel plate is conducted. According to the water-rich freeze-thaw broken surrounding rock tunnel supporting method, through advance supporting of advance small guide pipe combined cement paste-water glass double-grout grouting blocking, the water bursting and mud bursting phenomena occurring in the excavation process are reduced; through double grout of the reasonable ratio, the purpose of grouting blocking reinforcement can be rapidly achieved in the low-temperature environment; and after the section steel arch frame is arranged, primary supporting is conducted, the broken surrounding rock is blocked on the section steel arch frame through steel plate welding, and the problems of block falling and mud bursting in the construction process are avoided.

Description

technical field [0001] The invention relates to the field of tunnel support in tunnels and underground structures, in particular to a support method suitable for water-rich freeze-thaw broken surrounding rock tunnels. Background technique [0002] Grouting is one of the important methods to strengthen the surrounding rock and ensure the stability of the tunnel. At present, when the surrounding rock of the excavation face is broken and the amount of water inflow is large, pre-grouting around the surrounding rock is used to form a grouting consolidation of the surrounding rock, reduce its permeability coefficient, improve the self-stabilization ability of the surrounding rock, and ensure The cavern is stable and safe during construction. How to achieve rapid coagulation and rapid strength growth of slurry under low temperature conditions has become the focus of rapid and safe construction of tunnels in high-altitude winters in water-rich and broken surrounding rocks. [0003...

Claims

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Application Information

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IPC IPC(8): E21D11/18E21D11/10
CPCE21D11/18E21D11/10
Inventor 胡柱奎马志逵朱明丰孔超张俊儒马凯蒙朱林董昆吴金鑫刘瑞
Owner THE FIRST ENG CO LTD OF CTCE GRP
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