|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:

[1] JTJ 024-94,公路隧道施工技术规范[S]. JTJ 024-94,Code for Construction Technique of Highway Tunnel[S].
[2]TBJ 108-92,铁路隧道喷锚构筑法技术规则[S].TBJ 108-92,Shotcrete-Bolt Construction Method Precept of Railway Tunnel[S].
[3]关宝树.隧道工程施工要点集[M].北京:人民交通出版社,2003. GUAN Bao-shu.Construction Points Outline of Tunnel Engineering[M].Beijing:China Communications Press,2003.
[4]王建宇.隧道工程监测和信息化设计原理[M].北京:中国铁道出版社,1990. WANG Jian-yu.Monitoring Measurement of Tunnel Engineering and Design Principle for Information[M].Beijing:China Railway Publishing House,1990.
[5]刘宝有.钢弦式传感器及其应用[M].北京:中国铁道出版社,1986. LIU Bao-you.String Wire Sensor and Its Application[M].Beijing:China Railway Publishing House,1986.
[6]肖林萍,赵玉光,李永树.单拱大跨隧道信息化施工监控量测技术研究[J].中国公路学报,2005,18(4):62- 66. XIAO Lin-ping,ZHAO Yu-guang,LI Yong-shu.Research on Field Monitor Measuring Techniques in Informational Construction of Single Arch Long-Span Tunnel[J].China Journal of Highway and Transport,2005,18(4):62-66.
[7]李晓红.隧道新奥法及其量测技术[M].北京:科学出版社,2002. LI Xiao-hong.New Austrian Tunneling Method for Tunnel and Its Gauging Techniques [M].Beijing:Science Press,2002.
[8]夏才初.地下工程测试理论与监测技术[M].上海:同济大学出版社,1999. XIA Cai-chu.Testing Theory and Monitoring Measurement Techniques of Underground Engineering [M].Shanghai:Tongji University Press,1999.
[9]陈建勋.秦岭终南山特长公路隧道施工监控量测报告[R].西安:长安大学,2003. CHEN Jian-xun.The Construction Monitoring Measurement Report of Qinling Zhongnanshan Super- Long Highway Tunnel[R].Xi'an:Chang'an University,2003.

Memo

Memo:
-
Last Update: 2006-09-20