Research on Shallow Buried and Large-Span Tunnelling Undercrossing a Highway

Abstract:

WenXiang tunnel ,one of the tunnels constructed for the ZhengXi Special passenger Railway in china. In this project we have carried out a series of research on optimizing the construction method for shallow and large-span tunnels in loess condition. According to the field monitoring of ground settlement, vault settlement and primary support stress of the tunnel section before tunnelling underneath the LianHuo Highway, the result indicates that soil settlement and primary support stress can not be controlled very well, and current construction program needs to be reformed since it can not meet construction safety requirement. Our synthetical analysis comprises the optimized methods have been used in construction, such as reducing excavation area, increasing excavation steps of pilot tunnel, reserving core soil, closing invert punctually, reinforcing primary support, etc. The security and reliability also has been verified by numerial analysis sofeware FLAC^3D. From feedback of field implement and monitoring result, the effect of optimized method is significant; and all of these methods ensured this tough project implemented successfully. These results derived from our research are subject to a ceritain value that could be referred for future analogous project , in terms of controlling soil settlement and protecting surrouding building facilities.

• Periodical: Applied Mechanics and Materials (Volumes 90-93)
• Pages: 1748-1756
• DOI: https://doi.org/10.4028/www.scientific.net/AMM.90-93.1748
• Online since: September 2011
• Authors: Chun Yang Liu, Jian Li, Zhong Sheng Tan
• Keywords: Construction Optimization, Field Monitoring, Loess tunnel, Shallow Burying Mining, Undercrossing Construction

References

[1] TAN Zhongsheng,YU Yu,WANG Mingnian,"Experimental study on bolt effect on large section shallow depth loess tunnels,"Rock and Soil Mechanics,vol.29,p.491–496, February 2008.(in chinese)

[2] ZHANG Zhiqiang,HE Chuan,"Research on optimized construction procedure for double arched tunnel in unsymmetrical pressure,"Rock and Soil Mechanics, vol.28,p.723–727,May 2007. (in chinese)

[3] S. Jacobs and C. P. Bean, "Fine particles, thin films and exchange anisotropy," in Magnetism, vol. III, G. T. Rado and H. Suhl, Eds. New York: Academic, 1963, p.271–350. YANG Xiaoli,SUI Zhirong, "Numerical simulation of construction sequence for shallow em bedded bias tunnels with sm all clear distance,"J．Cent.South Univ. vol.38,p.764–770.April 2007.

[4] K. Elissa, "Title of paper if known," unpublished. LI Qiang,WANG Mingnian,LI Yuwen, "Three-dimensional mechanical effect analysis of two types of midboard for double span-arch-connecting tunnel,"Rock and Soil Mechanics,vol.27,p.667–672.April 2006.

[5] R. Nicole, "Title of paper with only first word capitalized," J. Name Stand. Abbrev., in press. ZHU Hehua,DING Wenqi. "The construction process simulation of underground structure," Chinese Journal of Rock Mechanics and Engineering, vol.18,p.558–562.May 1999.

[6] ZHANG Jianguo,WANG Mingnian,LIU Dagang, "Comparison of different working procedures by CRD method for shallow-buried subsea tunnel excavation,"Chinese Journal of Rock Mechanics and Engineering,vol.26,p.3639–3645.February 2007. (in chinese)

[7] M. Young, The Technical Writer's Handbook. Mill Valley, CA: University Science, 1989. SHI Cheng-hua,PENG Li-min,HUANG Juan, "Stratum deformation caused by different tunnel excavation steps," Chinese Journal of Geotechnical Engineering,vol.30,pp.:1303–1308. September 2008. (in chinese)