Numerical Study of Zonal Disintegration within a Rock Mass around a Deep Excavated Tunnel
Publication: International Journal of Geomechanics
Volume 12, Issue 4
Abstract
Zonal disintegration around a deep excavated tunnel is a characteristic of the rock mass intense fracturing phenomenon. In this paper, three-dimensional numerical tests on the failure processes of rock samples containing vertical wall semiarched tunnels are performed with the three-dimensional Realistic Failure Process Analysis (RFPA3D)–Parallel system model running on a Lenovo 1800 cluster, in order to study the configuration of zonal disintegration within the rock mass around the deep excavated tunnels. This study focuses on the zonal disintegration phenomenon in the tunnel longitudinal direction and the time-lag effect. Numerical results show that the microcracking in the disintegration zone within the model decreases gradually from the tunnel surface to the interior of the model along the tunnel longitudinal direction; the disintegration zone within the model also reduces, but the diameter of the disintegration zone becomes larger. Numerical results also indicate that an apparent time lag exists in the forming of the zonal disintegration. In other words, the zonal disintegration does not occur instantly after the excavation. Therefore, this time lag has to be considered carefully in the support design of the deep excavated tunnels.
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Acknowledgments
The study presented in this paper was jointly funded by the National Natural Science Foundation of China (Nos. 50874020, 50934006, 41172265), the 973 Program (No. 2007CB209407), the National Technology R&D Program for the 12th five-year plan (No. 2012BAB08B06), the Key Project for the Nature Science Research from the Guizhou Province Bureau of Education (2010003), the Governor Fund Project for Outstanding Scientific and Technological Education Talent from the Guizhou Province (2011-36), Guizhou Provincal Scientific and Technological Program (GY2011-3063), Special Project for Guizhou Province High-Level Personnel Scientific Research (TZJF-2010-044), the Introducing Talents Project of Guizhou University (2010-008), and the Opening fund of the State Key Laboratory of Geo-hazard Prevention and Geo-environment Protection, Chengdu University of Technology (SKLG P2010K008, P2012K008). The writers thank the editor and the reviewers for meticulous examinations, valuable comments, and constructive suggestions on the manuscript. The writers also thank Mr. Kodzo Dziwornu from the University of Mines and Technology, Ghana and Mr. Ali Siamaki from the University of Kashan, Iran for kind help and improvements on the manuscript.
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Information & Authors
Information
Published In
International Journal of Geomechanics
Volume 12 • Issue 4 • August 2012
Pages: 471 - 483
Copyright
© 2012. American Society of Civil Engineers.
History
Received: Sep 23, 2010
Accepted: Jul 8, 2011
Published online: Jul 11, 2011
Published in print: Aug 1, 2012
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