|Table of Contents|

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

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

Issue:
2011年01期
Page:
100-105
Research Field:
Publishing date:
2011-03-20

Info

Title:
Mechanical Monitoring and Analysis of Umbrella Arch Structure in Shallow-buried Bias Loess Tunnel Entrance
Author(s):
CHEN Jian-xun1;  QIAO Xiong1; 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
Keywords:
tunnel engineering;  loess;  shallow-buried bias;  umbrella arch;  monitoring
PACS:
U451.2
DOI:
-
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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Last Update: 2011-03-20