特大断面隧道分步施工动态压力拱分析研究

郑康成; 丁文其; 金威; 罗云

doi:10.11779/CJGE2015S1015

特大断面隧道分步施工动态压力拱分析研究 English Version

郑康成^{1, 2},
丁文其^{1, 2},
金威^{1, 2},
罗云³

1. 同济大学土木工程学院地下建筑与工程系,上海 200092; 2. 同济大学岩土及地下工程教育部重点实验室,上海 200092; 3. 深圳市交通公用设施建设中心,广东深圳 518000

基金项目: 国家“863”计划项目（2012AA112502）; 国家“973”计划项目（2014CB046905）

详细信息

作者简介:
郑康成(1992- ),男,硕士研究生,主要从事隧道及地下建筑方向研究。

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出版历程
- 收稿日期: 2015-03-25
- 发布日期: 2015-07-24

Experimental and numerical study on staged construction pressure arch of super large section tunnel

ZHENG Kang-cheng^{1, 2},
DING Wen-qi^{1, 2},
JIN Wei^{1, 2},
LUO Yun³

1. Department of Geotechnical Engineering, College of Civil Engineering, Tongji University, Shanghai 200092, China; 2. Key Laboratory of Geotechnical and Underground Engineering of Ministry of Education, Tongji University, Shanghai 200092, China; 3. Shenzhen Public Traffic Facilities Construction Center, Shenzhen 518000, China

摘要

摘要: 特大断面隧道的建设越来越多,传统规范荷载计算方法未考虑特大断面隧道施工的实际情况,计算结果偏大。在确定隧道压力拱判别方法的基础上,采用大型二维模型试验探究开挖过程中特大断面隧道压力拱的动态发展。从开挖洞周应力随开挖步变化的情况可以看出,大断面隧道压力拱是随着开挖步分区域、分阶段形成的,并采用数值分析对试验中的规律进行验证总结。为得到支护对压力拱发展的限制作用,采用二维精细化数值模型,模拟施工工况,探究支护对限制压力拱扩展的作用,得到大断面隧道复杂施工过程下压力拱的动态变化、压力拱高度折减系数,用于指导设计计算。
- 特大断面隧道 /
- 动态压力拱 /
- 模型试验 /
- 数值分析 /
- 支护作用
Abstract: There are more and more super large section tunnels. However, the calculated results by the traditional load calculation method are much larger than the real ones without considering the actual construction steps and support. Based on the method for discriminating the tunnel pressure arch, the dynamic development of pressure arch during the process of construction is studied by utilizing the large-scale two-dimensional model tests. It can be seen from the stress change around the hole that the pressure arch of large section tunnel forms in different regions by stages, along with the excavation steps. Then numerical analysis is conducted to verify and summarize the law found in the model tests. To study the restriction effect on pressure arch of support, a fine numerical model is established to simulate the construction conditions. The restriction effect on pressure arch of support is analyzed. Finally, the dynamic change of pressure arch and the reduction coefficient of arch height, which can be adopted to guide the design and calculation, are obtained.
- super large section tunnel /
- dynamic pressure arch /
- model test /
- numerical analysis /
- support action

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参考文献(7)

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