Research on simplified structural calculation method for up bamboo-truncated tunnel portal

ZHENG Yu-chao; QIU Wen-ge; ZHANG Jun-ru

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Research on simplified structural calculation method for up bamboo-truncated tunnel portal

更新时间：2026-06-25

- Research on simplified structural calculation method for up bamboo-truncated tunnel portal
- Vol. 29, Issue 1, (2008)
- 作者机构：
  
  西南交通大学土木工程学院,成都,610031
- 作者简介：
- 基金信息：
- DOI：
  CLC： U451
- Online First：18 July 2013，
  
  Published：2008
- 稿件说明：
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ZHENG Yu-chao, QIU Wen-ge, ZHANG Jun-ru. Research on simplified structural calculation method for up bamboo-truncated tunnel portal[J]. 2008, 29(1).
DOI：

ZHENG Yu-chao, QIU Wen-ge, ZHANG Jun-ru. Research on simplified structural calculation method for up bamboo-truncated tunnel portal[J]. 2008, 29(1). DOI：

摘要

切削式隧道洞门结构处于复杂的三维受力状态，需要采用三维数值计算才能得到相对正确的结果，为对计算模式进行简化，对Ⅴ级围岩条件下，1: 1.5坡度的正削式隧道洞门结构进行了尝试。首先对明挖法施工的洞门模型试验和三维数值计算所得到的拱顶围岩压力进行了验证，接着从研究围岩压力分布和结构受力特性着手，得到了结构横、纵向内力的控制截面，拱顶荷载q与的关系，绘制了横向的压力分布图式，并给出了纵向荷载的计算方法，从而将三维地层结构数值计算模式简化成横向封闭环和纵向弹性地基的平面荷载-结构计算模式，分别计算横、纵向内力。

Abstract

The bamboo-truncating tunnel portal’s structure is at complicated 3D stress condition

so 3D numerical calculation method is necessary to used for correct result relatively. For the simplifying calculation model

the trial was carried out for up bamboo-truncating tunnel portal which with the slope 1: 1.5 in Class Ⅴ surrounding rock. Firstly

the model test result was used to proof the arch crown surrounding rock stress which gained by 3D numerical analysis

both have good compatibility. Secondly proceed from the structural stress character and the distribution of surrounding rock stress

the inner force controlling cross-section of structural transverse and longitudinal direction were gained. Through the research

the relationship between q and of arch crown load in each pressure distribution figure was also obtained. Furthermore

the pressure distribution graphics in transverse direction was plotted; and load value calculation methods in longitudinal direction was provided. Therefore

the calculation model was simplified from 3D numerical structural calculation to load-structure model with transverse and longitudinal direction to calculate its inner force separately.

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