Monitoring and Reinforcement Technology of Passing Weak and Broken Rock Strata for Tunnel Boring Machine

Abstract:

The stability control of surrounding rock is a relatively important problem in tunnel boring machine (TBM) construction. The tunnel convergence deformation value was monitored in field while TBM passing weak and broken section of hydraulic tunnel. The correlation between tunnel convergence and surrounding rock stability is analyzed. The monitoring results show that: the characteristic of weak and broken Strata is closely correlated with some geological conditions, such as fault development, intrusive contact of orthophyre and lamprophyre veins. These supporting measures can well ensure the stability of surrounding rock in weak and broken section, such as sealing the inverted arch by using concrete of C25,reinforcing the inverted arch by steel arch of I10 and anchor construction in the roof. There is great difference between the properties of the weak and broken rocks on both sides, which is the main reason of the large tunnel convergence deformation. The monitoring results can provide reference for similar engineering in the future.

• Periodical: Applied Mechanics and Materials (Volumes 204-208)
• Pages: 2819-2823
• DOI: https://doi.org/10.4028/www.scientific.net/AMM.204-208.2819
• Online since: October 2012
• Authors: Tao Li, Kai Bin Liu, Wei Hong Yang, Bo Liu, Ying Chao Liu
• Keywords: Field Monitoring, Reinforcement Technology, Tunnel Boring Machine, Tunnel Convergence, Weak and Broken Strata

References

[1] Xue Lin. Viscoelastic displacement analytical solution of the surrounding rocks of the arch tunnel[J]. Chinese Journal of Geotechnical Engineering. 1996(5):96~101(in Chinese)

[2] Zhu Dayong, QianQihu, Zhou Zaosheng. Elastic Solution to Stresses of Rock Masses around Openings with Complex Shape[J]. Chinese Journal of Rock Mechanics and Engineering, 1999(4):402~404(in Chinese)

[3] Zhang Luqing, Yang Zhifa, Lu Aizhong. Analysis study on displacement field of surrounding rocks of two parallel tunnels with arbitrary shapes and its application to back-analysis of displacement[J]. Chinese Journal of Rock Mechanics and Engineering, 2000(3):584~589(in Chinese)

[4] Cheng Hua, Sun Jun. Numerical analysis of large non linear deformation mechanism for complex tunnel lining in incompetent countryrock[J]. Chinese Journal of Rock Mechanics and Engineering, 1997(4):327-336(in Chinese)

[5] ShiGH, GoodmanRE. Two-dimensionaldiseontinuousanalysis. Int. J.Numer. Anal. MethodsGeomeeh, 1985(7): 541~556

[6] Hart R, Cundall PA,Lemo SJ. Formulations of three-dimensional distinct element model. Part11: Mechanical calculation of a system composed of many polyhedral blocks. International Journal of Rock Mechanics and Mining Sciences,1988(3):117~125

DOI: 10.1016/0148-9062(88)92294-2

[7] Duncan J M. Factors of safety and reliability in geotechnical engineering[J]. Journal of Geotechnical and Geoenvironmental Engineering, 2000, 126(4): 307―316.

DOI: 10.1061/(asce)1090-0241(2000)126:4(307)

[8] Li Tao, Liu Bo, Jiang Yusheng, et al. 2008. Field instrumentation and 3-D numerical modeling on two adjacent metro shield tunnels beneath tall buildings, Boundaries of rock mechanics recent advances and challenges for 21st century, ISBN: 978-0-415-46934-0, Bei Jing, China, 649-654

DOI: 10.1201/9780203883204.ch122

[9] LI Tao, LIU Bo, TAO Long-guang. 2008. Interactions between deep excavation and nearby high-rise buildings. Journal of China University of Ming & Technology. 2008, 37(2): 241-245(in Chinese).