公路隧道预制二次衬砌支护时机数值分析
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1.上海交通大学;2.四川省公路规划勘察设计研究院有限公司

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U452

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Numerical analysis of the timing of precast secondary lining support in highway tunnels
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Shanghai Jiao Tong University

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    摘要:

    公路隧道二次衬砌多采用现场浇筑施工,早期强度低,养护维修困难。根据国内外地下工程建设经验,采用预制装配技术可以有效解决上述问题。本文通过对全断面法隧道施工开展数值模拟,研究了预制二次衬砌两种拼装时机下的围岩变形特性和支护结构受力特征。研究结果表明,贯通拼装工况下围岩变形速率较快,变形终值较大,初期支护承担大部分荷载;即时拼装工况下围岩变形较小,预制二次衬砌可以有效改善初期支护受力。研究成果可为装配式隧道确定预制二次衬砌合理支护时机提供理论参考。

    Abstract:

    The secondary lining of highway tunnels is mostly constructed on site, with low early strength and difficulty in maintenance. According to the experience of underground engineering construction at home and abroad, the use of prefabricated assembly technology can effectively solve the above problems. Through the numerical simulation of the full-section tunnel construction, this paper studies the deformation characteristics of surrounding rock and the stress characteristics of the supporting structure under the two assembly opportunities of precast secondary lining. The research results show that under the condition of continuous assembly, the surrounding rock deformation rate is faster, the final deformation value is larger, and the initial support bears most of the load; under immediate assembly conditions, the surrounding rock deformation is small, and the prefabricated secondary lining can effectively improve the initial support force. The research results can provide a theoretical reference for the prefabricated secondary lining reasonable support timing for the fabricated tunnel.

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刘谨豪,邓刚,陶双江,等. 公路隧道预制二次衬砌支护时机数值分析[J]. 科学技术与工程, , ():

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  • 收稿日期:2020-06-03
  • 最后修改日期:2020-07-08
  • 录用日期:2020-08-09
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