Abstract
This paper presents a case of a single tunnel excavated beneath closely spaced existing twin tunnels with reinforced MJS piles in Changsha, China. Due to soil disturbance and stress re-distribution induced by tunneling, the safety of overlying tunnels during excavating becomes a serious issue. To solve this problem, the Metro Jet System (MJS) method was used. The response of stratum and overlying tunnels are studied during the installation of horizontal MJS piles and shield tunneling, by monitoring pore water pressure of surrounding stratum, additional stress and vertical displacement of tunnel in the water-rich sand layer. It indicates that the pore water pressure increased rapidly during the period of jetting-grout and the maximum excess pore water pressure reached 35 kPa. The distribution of additional stress at monitoring cross-section is studied in different construction stages. The vertical displacement of the two existing tunnels presents distinct characters due to temporary road load on the tunnels. A satisfactory match between the proposed fitting curves and the measured settlement data of north tunnel is presented. Overall, MJS horizontal pile can effectively reduce the settlement of existing tunnel.
Access this chapter
Tax calculation will be finalised at checkout
Purchases are for personal use only
References
Kim, S.H., Burd, H.J., Milligan, G.W.E.: Model testing of closely spaced tunnels in clay. Geotechnique 48(3), 375–388 (1998)
Byun, G.W., Kim, D.G., Lee, S.D.: Behavior of the ground in rectangularly crossed area due to tunnel excavation under the existing tunnel. Tunn. Undergr. Space Technol. 21(3/4), 361–367 (2006)
Zhang, Z.G., Huang, M.S., Wang, W.D.: Response analysis of existing tunnels due to adjacent tunnelling in multi-layered soils. Chinese J. Geotech. Eng. 31(4), 600–608 (2009)
Addenbrooke, T.I., Potts, D.M.: Twin tunnel interaction: surface and subsurface effects. Int. J. Geomech. 1(2), 249–271 (2001)
Chehade, F.H., Shahrour, I.: Numerical analysis of the interaction between twin-tunnels: influence of the relative position and construction procedure. Tunn. Undergr. Space Technol. 23(2), 210–214 (2008)
Fang, Q., Zhang, D.L., Li, Q.Q., et al.: Effects of twin tunnels construction beneath existing shield-driven twin tunnels. Tunn. Undergr. Space Technol. 45, 128–137 (2015)
Peck, R.B.: Deep excavations and tunneling in soft ground. In: Proceedings of the 7th International Conference Soil Mechanics and Foundation Engineering. Mexico City, pp. 225–290 (1969)
Vorster, T.E.B., Klar, A., Soga, K., et al.: Estimating the effects of tunneling on existing pipelines. J. Geotech. Geoenviron. Eng. 131(11), 1399–1410 (2005)
Acknowledgements
The present work was carried out with the support of the National Key Research and Development Program of China (2016YFC0800207), National Natural Science Foundation of China (41472244), the Provincial Key Research and Development Program of Hunan (0105679005), the Industrial Technology and Development Program of Zhongjian Tunnel Construction Co., Ltd. (17430102000417) and the Research Program of Construction Engineering of Shenzhen (20151118003B).
Author information
Authors and Affiliations
Corresponding author
Editor information
Editors and Affiliations
Rights and permissions
Copyright information
© 2018 Springer Nature Singapore Pte Ltd. and Zhejiang University Press
About this paper
Cite this paper
Zhang, P., Liu, Y., Kang, X., Zhong, K., Chen, R. (2018). Application of Horizontal MJS Piles in Tunneling Beneath Existing Twin Tunnels. In: Chen, R., Zheng, G., Ou, C. (eds) Proceedings of the 2nd International Symposium on Asia Urban GeoEngineering. Springer Series in Geomechanics and Geoengineering. Springer, Singapore. https://doi.org/10.1007/978-981-10-6632-0_25
Download citation
DOI: https://doi.org/10.1007/978-981-10-6632-0_25
Publisher Name: Springer, Singapore
Print ISBN: 978-981-10-6631-3
Online ISBN: 978-981-10-6632-0
eBook Packages: EngineeringEngineering (R0)