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Construction method for karst tunnel to penetrate through deep gravel soil layer

A construction method and technology for tunnels, applied in tunnels, tunnel linings, earthwork drilling, etc., can solve problems such as easy deformation, unstable initial support, etc., and achieve vertical resistance, support effectiveness, and stress. effect of effect

Pending Publication Date: 2022-04-01
CHINA RAILWAY NO 2 ENG GRP CO LTD +1
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a construction method for karst tunnels passing through deep gravel soil layers, which is used to solve the technical problems of easy deformation and unstable initial support when existing construction methods pass through deep gravel soil layers

Method used

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  • Construction method for karst tunnel to penetrate through deep gravel soil layer
  • Construction method for karst tunnel to penetrate through deep gravel soil layer
  • Construction method for karst tunnel to penetrate through deep gravel soil layer

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Embodiment

[0040] This embodiment provides a construction method for a karst tunnel passing through a deep gravel soil layer, so as to improve the construction quality and ensure the reliability of the construction process during tunnel construction in the deep gravel soil layer.

[0041] First of all, the geological conditions should be detected according to the actual situation before construction to determine whether advance support is required. If advance support is required, the tunnel body should be excavated after the advance support is completed.

[0042] When advance support is required, advance support can be applied to the arch of the tunnel along the excavation direction of the tunnel. It should be noted that in order to improve the reliability of advance support, it provides more effective support for subsequent tunnel excavation. In the actual implementation of advance support, different measures are adopted for the advance support of the tunnel entrance section and the re...

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Abstract

The invention relates to the technical field of tunnel construction, and provides a construction method for a karst tunnel to penetrate through a deep gravel soil layer, and the tunnel is excavated by adopting a three-step reserved core soil temporary inverted arch method. According to the construction method provided by the invention, by properly increasing the excavation height in the excavation process, on one hand, the bonding and meshing area of the side wall support and the surrounding rock can be increased, so that the vertical resistance of the support is improved; and on the other hand, by increasing the rise span ratio, the stress effect of the support can be improved, and the support effect can be fully exerted. Meanwhile, by adopting the construction means of double-layer preliminary bracing, the bracing effect of the preliminary bracing and the stability of the preliminary bracing structure can be further improved, and it is guaranteed that the construction process is conducted safely and reliably.

Description

technical field [0001] The invention relates to the technical field of tunnel construction, in particular to a construction method for a karst tunnel passing through a deep gravel soil layer. Background technique [0002] Existing tunnels often use CD method, CRD method or double-side-wall pilot-pit method for construction when passing through soft soil layers. [0003] However, when the tunnel needs to pass through the deep gravel soil layer, due to the pure soil layer at this time, the soil quality is poor, so the conventional construction method is prone to deformation and unstable initial support during the construction process, and it is difficult to guarantee the construction. went well. Contents of the invention [0004] The purpose of the present invention is to provide a construction method for a karst tunnel passing through a deep gravel soil layer, which is used to solve the technical problems that the existing construction method is prone to deformation and th...

Claims

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Application Information

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IPC IPC(8): E21D11/10E21D11/18E21D20/00E21D21/00
Inventor 甘洪林陈耀王加一谢文清邓宝华杨龙伟侯建文鲜伟刘林
Owner CHINA RAILWAY NO 2 ENG GRP CO LTD
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