Seismic Stability of Subsea Tunnels Subjected to SeepageReport as inadecuate




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The Scientific World Journal - Volume 2014 2014, Article ID 631925, 8 pages -

Research Article

School of Civil Engineering, Lanzhou University of Technology, Lanzhou 730050, China

Key Laboratory of Urban Security and Disaster Engineering of Education, Beijing University of Technology, Beijing 100124, China

Department of Civil and Environmental Engineering, Northwestern University, Evanston, IL 60208, USA

Received 27 December 2013; Accepted 12 February 2014; Published 18 March 2014

Academic Editors: C. W. Chang-Jian and A. Rodríguez-Castellanos

Copyright © 2014 Xuansheng Cheng et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

Strength reduction method and ADINA software are adopted to study the stability of submarine tunnel structures subjected to seepage and earthquake under different seawater depths and overlying rock strata thicknesses. First, the excess pore water pressure in the rock mass is eliminated through consolidation calculation. Second, dynamic time-history analysis is performed by inputting the seismic wave to obtain the maximum horizontal displacement at the model top. Finally, static analysis is conducted by inputting the gravity and the lateral border node horizontal displacement when the horizontal displacement is the largest on the top border. The safety factor of a subsea tunnel structure subjected to seepage and earthquake is obtained by continuously reducing the shear strength parameters until the calculation is not convergent. The results show that the plastic zone initially appears at a small scope on the arch feet close to the lining structure and at both sides of the vault. Moreover, the safety factor decreases with increasing seawater depth and overlying rock strata thickness. With increasing seawater depth and overlying rock strata thickness, maximum main stress, effective stress, and maximum displacement increase, whereas displacement amplitude slightly decreases.





Author: Xuansheng Cheng, Yi Ren, Xiuli Du, and Yida Zhang

Source: https://www.hindawi.com/



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