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Composite lining design method with preliminary bracing as main bearing structure

A technology of initial support and design method, which is applied in the direction of shaft lining, tunnel lining, mining equipment, etc., to speed up the construction progress and improve the quality of tunnel structure

Inactive Publication Date: 2016-09-28
CHINA RAILWAY FIFTH SURVEY & DESIGN INST GRP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Exactly how much role does primary support play and how much load it bears during construction and operation? How much safety margin can be provided by increasing the thickness of the secondary lining? These problems have always plagued tunnel designers, making it difficult for designers to determine an economically reasonable design scheme on the basis of an overall view
[0003] At present, there are few studies on the durability of primary support of sprayed concrete, and the relevant codes of my country's railways only put forward specific requirements for the durability of secondary lining;

Method used

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  • Composite lining design method with preliminary bracing as main bearing structure
  • Composite lining design method with preliminary bracing as main bearing structure
  • Composite lining design method with preliminary bracing as main bearing structure

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specific Embodiment approach

[0021] The composite lining design method with primary support as the main load-bearing structure of the present invention, its preferred specific implementation mode is:

[0022] Including applicability judgment of primary support, primary support design method and secondary lining design method;

[0023] The primary support is mainly composed of anchor rods, shotcrete, steel mesh and steel frame. The applicability judgment of the primary support includes: the pH value of the groundwater is greater than 3, the groundwater does not contain sulfate and the water pressure is less than 0.2 MPa environment, the primary support is used as the main bearing structure of the composite lining;

[0024] The design method of the primary support includes: adopting the definition of the surrounding rock pressure arch, the boundary value of the surrounding rock pressure arch, and the plastic loosening pressure and deformation pressure proposed by the theoretical analysis, and the primary su...

specific Embodiment

[0035] The present invention is implemented in Jiaozhuang Tunnel of Lianyan Railway, and optimized design is carried out for III, IV, and V surrounding rocks, and the optimized lining section is shown in the attached Figure 1~4 , the cross-section designed using the design method in the prior art is shown in the appendix Figure 5-8 , engineering quantity and economic benefit comparison are shown in Table 1. Construction monitoring data show that the structure is stable and meets the requirements.

[0036] Table 1 Comparison of main engineering quantities and economic benefits of 120km / h single-track tunnel:

[0037]

[0038] Note: A positive value in the table means that the optimized value is larger than the actual value, otherwise the actual value is smaller.

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Abstract

The invention discloses a composite lining design method with primary support as the main bearing structure, including the applicability judgment of primary support, the design method of primary support and the secondary lining design method; when the pH value of groundwater is greater than 3, In the environment where the groundwater does not contain sulfate and the water pressure is less than 0.2MPa, the primary support is used as the main load-bearing structure of the composite lining; the load-structure calculation model can be used for the support structure where the primary support is the main load-bearing structure, and the initial The support is the quantitative design parameter of the primary support of the main load-bearing structure; the secondary lining is only used as a safety reserve to bear accidental loads due to the deterioration of the primary support and earthquakes, and the parameters are determined according to the requirements of the structural structure and the operating environment of the tunnel. The composite lining design of the tunnel with the primary support as the main bearing structure can give full play to the role of the primary support, improve the quality of the tunnel structure, and speed up the construction progress.

Description

technical field [0001] The invention relates to a composite lining technology for mountain tunnels, in particular to a composite lining design method with primary support as the main bearing structure. Background technique [0002] Composite lining has become the main lining structure type of mountain tunnels. However, due to the complexity of underground engineering, the design methods of composite lining structures used by countries around the world are different so far, and the requirements of different industry standards in my country are also different. Exactly how much role does primary support play and how much load it bears during construction and operation? How much safety margin can be provided by increasing the thickness of the secondary lining? These problems have been puzzling tunnel designers, making it difficult for designers to determine an economical and reasonable design scheme on the basis of looking at the overall situation. [0003] At present, there a...

Claims

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Application Information

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IPC IPC(8): E21D11/00E21D20/00E21D11/10E21D11/14E21D11/15
CPCE21D11/00E21D11/10E21D11/14E21D11/152E21D20/00
Inventor 罗章波杨岳勤赵勇苏新民杨国柱刘勇朱永全丁祥郭庆昊刘彦文胡玉林宋玉香李文江高新强路美丽卢裕杰
Owner CHINA RAILWAY FIFTH SURVEY & DESIGN INST GRP
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