自然科学版 英文版
自然科学版 英文版
自然科学版 英文版

您目前所在的位置:首页 - 期刊简介 - 详细页面

中南大学学报(自然科学版)

Journal of Central South University

第42卷    第5期    总第201期    2011年5月

[PDF全文下载]    [Flash在线阅读]

    

文章编号:1672-7207(2011)05-1454-07
雪峰山隧道原岩应力场和开挖二次应力场特征分析
黄戡1, 2,彭建国2,刘宝琛1,丁国华2,王跃飞2,马德青2

(1. 中南大学 土木建筑学院,湖南 长沙,410075;
2. 湖南省交通规划勘察设计院,湖南 长沙,410008
)

摘 要: 为了解雪峰山隧道原岩应力场和隧道开挖后围岩的二次应力场分布特点,应用有限元软件建立仿真模型,模拟河谷下蚀和隧道开挖过程。为了验证数值模型的可靠性,对比分析相应位置的现场测试应力和数值模拟应力,并以现场应力测试值对应力边界的应力进行反演分析。研究结果表明:应力数值模拟值和现场测试值较接近,说明所建模型可靠;隧道轴线剖面主应力可分为应力平稳带和浅表生改造影响带;在应力平稳带的硬、软相间部位或断层带附近出现应力分异现象;浅表生改造影响带通常为应力降低区,地形明显变化处可造成应力局部增高;隧道周边的最大主应力出现应力集中;随着与隧道周边的距离增加,最大主应力很快降低;隧道周边未出现拉应力,开挖影响范围为地表至1倍洞径之间。

 

关键字: 隧道工程;原岩应力;二次应力场

Analysis of initial rock stress field and
secondary rock stress field of Xuefengshan tunnel
HUANG Kan1, 2, PENG Jian-guo2, LIU Bao-chen1, DING Guo-hua2, WANG Yue-fei2, MA De-qing2

1. School of Civil Engineering and Architecture, Central South University, Changsha 410075, China;
2. Hunan Provincial Communication Planning Survey and Design Institute, Changsha 410008, China

Abstract:To understand initial rock stress field and secondary rock stress field due to excavation in Xuefengshan tunnel, finite element software was used to establish numerical model to simulate the valley incision and tunneling process. In order to verify the reliability of the numerical model, comparison of stress numerical values and monitoring values in field tests was conducted, and the stress boundary was done. The results show that the model is reliable because numerical simulation stress is close to that of the field test. The spread of stress can be divided into two bands, i.e., the equable stress band and the effected band of epigentic-surface reformation. Around fracture in the equable stress band, there are stress varied phenomena and local high stress bands in the effected band, especially at the position of apparent landform chance. Stress concentration is serious around the tunnel. With the increase of the distance from the tunnel, the maximum principal stress decreases rapidly. Tensile stress does not appear around the tunnel, and the excavation influence band is from 0 to 1 times of the hole diameter.

 

Key words: tunnel engineering; initial stress field; secondary stress field

中南大学学报(自然科学版)
  ISSN 1672-7207
CN 43-1426/N
ZDXZAC
中南大学学报(英文版)
  ISSN 2095-2899
CN 43-1516/TB
JCSTFT
版权所有:《中南大学学报(自然科学版、英文版)》编辑部
地 址:湖南省长沙市中南大学 邮编: 410083
电 话: 0731-88879765 传真: 0731-88877727
电子邮箱:zngdxb@csu.edu.cn 湘ICP备09001153号