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《建筑科学与工程学报》[ISSN:1673-2049/CN:61-1442/TU]

卷:

28卷

期数:

2011年01期

页码:

100-105

栏目:

出版日期:

2011-03-20

文章信息/Info

Title:

Mechanical Monitoring and Analysis of Umbrella Arch Structure in Shallow-buried Bias Loess Tunnel Entrance

作者:

陈建勋¹,乔雄^1,2

1. 长安大学 陕西省公路桥梁与隧道重点实验室,陕西 西安 710064; 2. 兰州理工大学 土木工程学院,甘肃 兰州 730050

Author(s):

CHEN Jian-xun¹, QIAO Xiong^1,2

1. Key Laboratory for Highway Bridge and Tunnel of Shaanxi Province, Chang'an University, Xi'an 710064, Shaanxi, China; 2. School of Civil Engineering, Lanzhou University of Technology, Lanzhou 730050, Gansu, China

关键词:

隧道工程;  黄土;  浅埋偏压;  套拱;  监测

Keywords:

tunnel engineering;  loess;  shallow-buried bias;  umbrella arch;  monitoring

分类号:

U451.2

DOI:

-

文献标志码:

A

摘要:

为了解黄土隧道浅埋偏压洞口段套拱结构的受力状况,对刘家坪2号隧道洞口段套拱基底应力、钢架应力、混凝土应力及拱顶下沉进行施工监测,并对监测结果进行分析。结果表明:浅埋偏压情况下,套拱两侧基底应力分布不均匀,拱顶填土引起基底应力急剧增长,仰拱施作后基底应力趋于稳定; 套拱钢架受力复杂,有拉有压,且值很大,仰拱开挖引起钢架应力急剧增长,钢架在套拱支护结构中发挥了强大的支护作用; 冬、夏季温差引起套拱混凝土应力随时间(季节)的变化呈现拉、压交替变化,夏季出现最大压应力,冬季出现最大拉应力,且压应力较小,拉应力较大,多处测点都超过了C25模筑混凝土设计轴心抗拉强度; 套拱拱顶下沉主要由洞顶填土施工和仰拱开挖引起。

Abstract:

In order to understand the structural mechanical properties of umbrella arch in shallow-buried bias loess tunnel entrance, stress of umbrella arch base, stress of steel frame, concrete stress and vault crown settlement were monitored and analyzed in tunnel entrance of Liujiaping 2^# Tunnel.The results show that in shallow-buried bias tunnel, the stress distribution in the umbrella arch base is not uniform, and filling soil in the vault crown makes the stress of umbrella arch base increase rapidly, the stress of umbrella arch base tends to be steady after the contruction of inverted arch. Stress of steel frame of umbrella arch increases rapidly after the excavation of inverted arch, which is very complex, including tension and compression, and the value is large, support action of steel frame in the umbrella arch is significant. The umbrella arch is statically indeterminate structure, temperature difference in winter and summer makes concrete stress of umbrella arch alternatively change with the variation of time(season), compressive stress is maximum in summer and tensile stress is maximum in winter, and the compressive stress is small and the tensile stress is large.The tensile stresses in many measuring points are bigger than design axis tensile strength of C25 diecasting concrete. The vault crown settlement of umbrella arch is caused by filling soil in the vault crown and excavation of inverted arch.

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备注/Memo

备注/Memo:

收稿日期:2010-12-02
基金项目:国家西部交通建设科技项目(2007 318 812 68)
作者简介:陈建勋(1969-),男,陕西韩城人,教授,工学博士,E-mail:chenjx1969@163.com。

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更新日期/Last Update: 2011-03-20