Analysis for Microseismic Energy of Immediate Rockbursts in Deep Tunnels with Different Excavation Methods
Publication: International Journal of Geomechanics
Volume 17, Issue 5
Abstract
This study integrates microseismic data and data from hundreds of rockbursts of different intensities that occurred in a water drainage tunnel and four deep headrace tunnels at Jinping II Hydropower Station in Sichuan Province, China. The tunnels with overburden depths between 1,900 and 2,525 m, the maximum principal stress of which reaches 63 MPa in a rock mass, is composed mainly of marble. The tunnels have a total length of 12.4 km. The microseismic energy produced during the development of immediate rockbursts induced by the excavation by the drill-and-blast method (DBM) and a tunnel-boring machine (TBM) were studied. The results indicate that the daily maximum microseismic energy can be used as a basis for estimating rockburst intensity. The daily maximum microseismic energy (logarithm) corresponds to intense rockbursts (>6), moderate rockbursts (between 5 and 6), weak rockbursts (between 4 and 5), and no rockbursts (<4). Before the occurrence of intense rockbursts, there were numerous weak and moderate rockbursts during TBM excavation, whereas such a phenomenon was not observed during DBM excavation. The microseismic energy (logarithm) primarily concentrated in the range of 1 to 5 under TBM excavation, which is concentrated in the range of –1 to 4 under DBM excavation. For rockbursts of the same intensity, the range of microseismic energy remained the same for either type of excavation method. The distribution range of the microseismic energy moved in the direction of high energy as the level of rockburst intensity rose (intense rockbursts > moderate rockbursts > weak rockbursts > no rockburst). Microseismic energy can be used as a guideline for building a warning system and reduce the risk of rockbursts during construction.
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Acknowledgments
The authors acknowledge the financial support from National Key Technologies R&D Program of China under Grant 2013BAB02B01; the National Natural Science Foundation of China under Grant 51509092&51479192; the Fund of State Key Laboratory of Geomechanics and Geotechnical Engineering Grant Z015004; the Fund of Jiangxi Province (Grant 20161BAB216141); and funding from the Jiangxi Province Department of Education (Grant 150518). The original monitoring data were derived from State Key Laboratory of Geomechanics and Geotechnical Engineering Institute of Rock and Soil Mechanics, Chinese Academy of Sciences, Wuhan.
References
Abuov, M. G., Aitaliev, S. M., Ermekov, T. M., Zhanbyrbaev, N. B., and Kayupov, M. A. (1988). “Studies of the effect of dynamic processes during explosive break-out upon the roof of mining excavations.” J. Min. Sci., 24(6), 58l–590.
Barton, N. (2000). TBM tunneling in jointed and faulted rock, Balkema, Rotterdam, Netherlands, 61–64.
Cai, M. (2008). “Influence of stress path on tunnel excavation response—Numerical tool selection and modeling strategy.” Tunnelling Underground Space Technol., 23(6), 618–628.
Chattopadhyay, A., Singh, A., and Dhua, S. (2014). “Effect of heterogeneity and reinforcement on propagation of a crack due to shear waves.” Int. J. Geomech., 04014013.
Chen, B. R., Feng, X. T., Li, Q. P., Luo, R. Z., and Li, S. (2015). “Rock burst intensity classification based on the radiated energy with damage intensity at Jinping II Hydropower Station, China.” Rock Mech. Rock Eng., 48(1), 289–303.
Chen, B. R., Feng, X. T., and Ming, H. J. (2012). “Evolution law and mechanism of rockburst in deep tunnels: Time-delayed rockburst.” Chin. J. Rock Mech. Eng., 31(3), 561–569 (in Chinese).
Cook, M. A., Cook, U. D., and Clay, R. B. (1966). “Behavior of rock during blasting.” Trans. Soc. Min. Eng., 10(2), 17–25.
Eshragi, A., and Zare, S. (2015). “Face stability evaluation of a TBM-driven tunnel in heterogeneous soil using a probabilistic approach.” Int. J. Geomech., 04014095.
Feng, G. L., Feng, X. T., Chen, B. R., Xiao, Y. X., and Jiang, Q. (2015). “Sectional velocity model for microseismic source location in tunnels.” Tunnelling Underground Space Technol., 45, 73–83.
Feng, X. T., Chen, B. R., and Zhang C. Q. (2013). Mechanism warning and dynamic control of rockburst development processes, China Social Sciences Publishing House, Beijing (in Chinese).
Feng, X. T., and Zhou, H. (2006). Research report on stability of surrounding rock mass and structure design of diversion tunnels of Jinping II Hydropower Station at Yalong River during invite public bidding and design phase, Institute of Rock and Soil Mechanics, Chinese Academy of Sciences, Wuhan, China.
He, M. C., Miao, J. L., and Feng, J. L. (2010). “Rock burst process of limestone and its acoustic emission characteristics under true-triaxial unloading conditions.” Int. J. Rock Mech. Min. Sci., 47(2), 286–298.
Li, T., Cai, M. F., and Cai, M. (2007). “A review of mining-induced seismicity in China.” Int. J. Rock Mech. Min. Sci., 44(8), 1149–1171.
Mendecki, A. J., Van Aswegen, G., and Mountfort, P. (1999). “A guide to routine seismic monitoring in mines.” Chapter 1, A handbook on rock engineering practice for tabular hard rock mines, Safety in Mines Research Advisory Committee, Johannesburg, South Africa, 287–309.
Read, R. S. (2004). “20 years of excavation response studies at AECL’s underground research laboratory.” Int. J. Rock Mech. Min. Sci., 41(8), 1251–1275.
Rutqvist, J., and Rinaldi, A. (2013). “Modeling ground deformations and potential for induced micro-seismicity at the In Salah CO2 storage operation, Algeria.” Poromechanics V, 1299–1308.
Savoikar, P., and Choudhury, D. (2012). “Translational seismic failure analysis of MSW landfills using pseudodynamic approach.” Int. J. Geomech., 136–146.
Tang, B. Y. (2000). “Rockburst control using distress blasting.” Ph.D. thesis, McGill Univ., Montreal.
Tang, S. H., Pan, Y., Huang, Y. H., and Ji, X. W. (2009). “Application research of microseismic monitoring technology to geostress hazards in deep mining.” Chin. J. Rock Mech. Eng., 28(S2), 3597–3603 (in Chinese).
Tang, Y. (1992). “A new classification of rockburst intensity.” Geol. Rev., 38(5), 439–443.
Wang, L. S., Li, T. B., and Xu, J. (1999). “Study on rockburst and its intensity classifies in the tunnel of Erlang Mountain road.” Road, 2, 41–45.
Yan, P., Lu, W. B., and Chen, M. (2011). “In-situ test research on influence of excavation method on induced damage zone in deep tunnel.” Chin. J. Rock Mech. Eng., 30(6), 1097–1106 (in Chinese).
Zhang, C. Q., Feng, X. T., Zhou, H., Qiu, S. L., and Wu, W. P. (2012a). “Case histories of four extremely intense rockbursts in deep tunnels.” Rock Mech. Rock Eng., 45(3), 275–288.
Zhang, C. Q., Feng, X. T., Zhou, H., Qiu, S. L., and Wu, W. P. (2012b). “A top pilot tunnel preconditioning method for the prevention of extremely intense rockbursts in deep tunnels excavated by TBMs.” Rock Mech. Rock Eng., 45(3), 289–309.
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Information
Published In
International Journal of Geomechanics
Volume 17 • Issue 5 • May 2017
Copyright
© 2016 American Society of Civil Engineers.
History
Received: Mar 24, 2016
Accepted: Aug 2, 2016
Published online: Oct 6, 2016
Discussion open until: Mar 6, 2017
Published in print: May 1, 2017
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