Excavation-Damaged Zone around Tunnel Surface under Different Release Ratios of Displacement
Publication: International Journal of Geomechanics
Volume 17, Issue 4
Abstract
A tunnel excavation-damaged zone (EDZ) will gradually form with increasing release ratios of displacement (RRD) in the rock mass surrounding a tunnel. This paper presents a study of the longest subway tunnel in China, constructed with tunnel-boring machines (TBM) and the new Austrian tunneling method (NATM) in soft and weak rock ground. On the basis of the damage constitutive model, some studies are conducted using the FEM. The spatial distribution rules of EDZ and RRD are studied with a three-dimensional (3D) numerical simulation. The results show that the spatial support effect of the tunnel face is concentered in the range of approximately two times that of the tunnel diameter. A two-dimensional numerical simulation is carried out to study the relationship between the EDZ and RRD. The results show that the EDZ initiates when the RRD is more than 0.5, and the EDZ suddenly increases when RRD is more than 0.9.
Get full access to this article
View all available purchase options and get full access to this article.
Acknowledgments
This work is supported by the National Science Fund of China (Grants 51308574 and 51509219), the Postdoctoral Science Foundation of China (Grant 2014M562286), the Natural Science Project of Chongqing Education Commission (Grant KJ130404), the project of the Chongqing Science and Technology Commission (Grants cstc2013jcyjA30007, cstc2016shmszx30009, and cstc2014jcyjA30023), the Postdoctoral Science Foundation of Chongqing (Grant Xm2014092), and the postdoctoral daily funds of Chongqing (Grant Rc201428).
References
Abaqus [Computer software]. SIMULIA, Providence, RI.
Addenbrooke, T. I., and Potts, D. M. (2001). “Twin tunnel interaction: Surface and subsurface effects.” Int. J. Geomech., 249–271.
Aydan, Ö., Akagi, T., and Kawamoto, T. (1993). “The squeezing potential of rocks around tunnels: Theory and prediction.” Rock Mech. Rock Eng., 26(2), 137–163.
Bobet, A. (2009). “Elastic solution for deep tunnels: Application to Excavation damage zone and rockbolt support.” Rock Mech. Rock Eng., 42(2), 147–174.
Cai, M., and Kaiser, P. K. (2004). “Assessment of excavation damaged zone using a micromechanics model.” Tunnelling Underground Space Technol., 20(6), 301–310.
Huang, F., Zhu, H. H., Jiang, S. P., and Liang, B. (2016). “The excavation damage zone of subway tunnel considering stress release.” Proc., Geochina 4th, Geotechnicical Special Publication (GSP260), ASCE, Reston, VA, 174–181.
Huang, F., Zhu, H. H., Xu, Q. W., Cai, Y., and Zhuang, X. (2013). “The effect of weak interlayer on the failure pattern of rock mass around tunnel: Scaled model tests and numerical analysis.” Tunnelling Underground Space Technol., 35(4), 207–218.
Kwon, S., Lee, C. S., Cho, S. J., Jeon, S. W., and Cho, W. J. (2009). “An investigation of the excavation damaged zone at the KAERI underground research tunnel.” Tunnelling Underground Space Technol., 24(1), 1–13.
Lai, X. P., Ren, F. H., Wu, Y. P., and Cai, M. F. (2009). “Comprehensive assessment on dynamic roof instability under fractured rock mass conditions in the excavation disturbed zone.” Int. J. Miner. Metall. Mater., 16(1), 12–18.
Lee, Y. Z., and Schubert, W. (2008). “Determination of the round length for tunnel excavation in weak rock.” Tunnelling Underground Space Technol., 23(3), 221–231.
Lee, Y. L., Lin, M. Y., and Hsu, W. K. (2008). “Study on relationship between convergence loss and longitudinal deformation curve in tunnel excavation by using three-dimensional finite element analysis.” Chin. J. Rock Mech. Eng., 27(2), 258–265.
Lemaitre, J. (1983). “A continuous damage mechanic model for ductile fracture.” J. Eng. Mater. Technol., 107(1), 83–89.
Li, S. C., Zhao, Y., and Li, L. P. (2011). “Study of construction section comprehensive load releasing process of ultra-large section railway tunnel.” Rock Soil Mech., 32(9), 2845–2851.
Malmgren, L., Saiang, D., Töyrä, J., et al. (2007). “The excavation disturbed zone (EDZ) at Kiirunavaara mine, Sweden: By seismic measurements.” J. Appl. Geophys., 61(1), 1–15.
Popp, T., Salzer, K., and Minkley, W. (2008). “Influence of bedding planes to EDZ evolution and the coupled HM properties of Opalinus Clay.” Phys. Chem. Earth., 33, 374–387.
Ranjbarnia, M., Fahimifar, A., and Oreste, P. (2016). “Practical method for the design of pretensioned fully grouted rockbolts in tunnels.” Int. J. Geomech., 04015012.
Sulem, J., Panet, M., and Guenot, A. (1987). “An analytical solution for time-dependent displacements in a circular tunnel.” Int. J. Rock Mech. Min. Sci. Geomech. Abstr., 24(3), 155–164.
Sun, J., and Zhu, H. H. (1994). “Mechanical simulation and analysis of behaviour of soft and weak rocks in the construction of a tunnel opening.” Chin. Rock Soil Mech., 15(4), 20–33.
Tsang, C. F., Bernier, F., and Davies, C. (2005). “Geohydromechanical processes in the excavation damaged zone in crystalline rock, rock salt, and indurated and plastic clays in the context of radioactive waste disposal.” Int. J. Rock Mech. Min. Sci., 42(1), 109–125.
Wang, H. N., and Nie, G. H. (2010). “Analytical expressions for stress and displacement fields in viscoelastic axisymmetric plane problem involving time-dependent boundary regions.” Acta Mech., 210(3), 315–330.
Wang, S., Yin, X. T., Tang, H, and Ge, X. (2010). “A new approach for analyzing circular tunnel in strain-softening rock masses.” Int. J. Rock Mech. Min. Sci., 47(1), 170–178.
Zhu, H. H., and Huang, F. (2010). “Assessment of excavation damaged zone using an isotropic elastoplastic damage model.” Proc., 4th Japan-China Geotechnical Symp., Recent Developments of Geotechnical Engineering, Japanese Geotechnical Society, Okinawa, Japan, 236–240.
Information & Authors
Information
Published In
International Journal of Geomechanics
Volume 17 • Issue 4 • April 2017
Copyright
© 2016 American Society of Civil Engineers.
History
Received: Mar 10, 2016
Accepted: May 31, 2016
Published online: Sep 1, 2016
Discussion open until: Feb 1, 2017
Published in print: Apr 1, 2017
Authors
Metrics & Citations
Metrics
Citations
Download citation
If you have the appropriate software installed, you can download article citation data to the citation manager of your choice. Simply select your manager software from the list below and click Download.