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A Dynamic Design Method of Tunnel Initial Support Based on Deformation-Structure Method

A technology of initial support and dynamic design, which is applied in the dynamic design of railway and highway tunnel construction stages, and in the field of highway tunnel construction engineering design, can solve problems such as poor economy, and achieve good timeliness and economy

Active Publication Date: 2019-03-12
SOUTHWEST JIAOTONG UNIV +1
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the load on the initial support in the current code, the loose load of the surrounding rock is used instead of the deformation load that is more in line with the actual situation, which makes the design of the initial support conservative and economical.

Method used

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  • A Dynamic Design Method of Tunnel Initial Support Based on Deformation-Structure Method
  • A Dynamic Design Method of Tunnel Initial Support Based on Deformation-Structure Method
  • A Dynamic Design Method of Tunnel Initial Support Based on Deformation-Structure Method

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Embodiment

[0048] A 350km / h high-speed railway tunnel under construction has an excavation height of 12.78m and an excavation span of 15.2m. The tunnel is a deep buried tunnel, and the surrounding rock condition is Class IV. The initial support is a reinforced concrete structure, using C30 shotcrete and HRB400 steel bars, with a thickness of 0.25m. Surrounding rock and building material parameters are selected according to "Tunnel Regulations". First provide the concrete flow chart of embodiment, see figure 1 , including the following steps:

[0049] (1) Establish the physical model of the surrounding rock and the primary support structure of the tunnel: the beam-spring model. Such as figure 2 shown, including the following steps:

[0050] 1) The primary support is discretized into 44 elastic beam elements with a unit length of 1.0m, and the element stiffness matrix in the local coordinate system is [k′ 1 ] 6×6 , the element stiffness matrix in the global coordinate system is [k ...

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Abstract

The invention provides a dynamic design method of initial support of tunnel based on deformation structural method. Including: the construction of a beam-spring model of surrounding rock and the initial support structure, the deformation data of initial support are obtained, Calculate the load, determine the structural internal force of the initial supporting structure, determine the safety factorof the initial supporting structure according to the calculation of the structural internal force, evaluate the safety of the initial supporting structure according to the safety factor, and completethe design of the initial supporting structure of the tunnel until the initial supporting structure meets the safety requirements. The invention determines the structural internal force of the initial support through the calculation load of the support deformation, which is high in efficiency, convenience and good in timeliness. It provides the basis for changing the design parameters of the initial support, realizes the dynamic design of the initial support, and realizes the quantification of the initial support combined with the safety factor. The ultimate deformation of the initial supportcan be easily predicted based on the time history curve of the node displacement, so that the ultimate load of the initial support can be predicted.

Description

technical field [0001] The invention belongs to the technical field of railway and highway tunnel construction engineering design, in particular to the technical field of railway and highway tunnel design methods, and in particular to the technical field of dynamic design of railway and highway tunnel construction stages. Background technique [0002] With the gradual improvement of my country's transportation network, the number of railway and highway tunnels has increased rapidly, and my country has become a veritable tunnel country. After the excavation of the tunnel, in order to control the proper release of surrounding rock stress and deformation of the surrounding rock, and also to increase the safety of the structure and facilitate construction, it is often necessary to implement primary support. The initial support generally refers to the bolt shotcrete support, and if necessary, steel fiber shotcrete or steel mesh, steel frame, etc. can be used together. In the cur...

Claims

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Application Information

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IPC IPC(8): G06F17/50
CPCG06F30/13G06F30/23
Inventor 王明年刘大刚杨涅赵思光于丽童建军
Owner SOUTHWEST JIAOTONG UNIV
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