|Table of Contents|

Construction Monitoring and Measuring in Segments of Large Embedded Depth in Qinling Zhongnanshan Super-Long Highway Tunnel(PDF)

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

Issue:
2006年03期
Page:
71-
Research Field:
Publishing date:
2006-09-20

Info

Title:
Construction Monitoring and Measuring in Segments of Large Embedded Depth in Qinling Zhongnanshan Super-Long Highway Tunnel
Author(s):
CHEN Jian-xun1;  YANG Zhong2;  YUAN Xue-kan2
1. Key Laboratory for Bridge and Tunnel of Shaanxi Province, Chang'an University, Xi'an 710064, Shaanxi, China; 2. Shaanxi Qinling Zhongnanshan Highway Tunnel Ltd, Xi'an 710054, Shaanxi, China
Keywords:
super-long highway tunnel;  large embedded depth;  monitoring and measuring;  steel frame;  distortion
PACS:
U451.2
DOI:
-
Abstract:
To discuss the mechanical characteristics of tunnel surrounding rock distortion, surrounding rock pressure stress and supporting structure when tunnel was under the conditions of large embedded depth and weak surrounding rock, authors took some testing organs, such as SWJ-Ⅳ type convergence indicator, vibrational chord type soil pressure cell, etc. In Ⅲ class surrounding rock segments with embedded depth more than 1 200 m in Qinling Zhongnanshan super -long highway tunnel, those monitoring and measuring as net convergence distortion,surrounding rock pressure stress, sprayed concrete stress, steel frame strain and axial force of anchor bar were made. The results show that tunnel in conditions of large embedded depth and weak surrounding rock can produce large distortion, even if on the effect of primary support, the measured value and speed of convergence are still large; the stress in primary support is very large especially in profiled bar steel frame, the inner and outside edge of steel frame are in stress condition and most steel frame stresses exceed steel yield limit, the steel stress in unstable condition; the support like Ⅰ16 profiled bar steel frame(space between 1 set· m-1), 3.5 m length rock bolts and 20 cm depth sprayed concrete are not enough in that segments; the supporting strength should be consolidated through some measures, such as reducing the space between steel frame[reduce to 3 set·(2 m)-1] and so on; sprayed concrete should be made in time and full in construction, then it can ensure rock bolts, sprayed concrete, bar mat reinforcement and steel frame in chorus, if not, the distortion of steel frame would be large and collapse accidents may happen indeed.

References:

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Memo

Memo:
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Last Update: 2006-09-20