Elastoplastic Analysis of Surrounding Rocks of Submarine Tunnel with Consideration of Seepage
WANG You1, WANG Xing-hua1, CHEN Jun-ru2
1. School of Civil Engineering, Central South University, Changsha Hunan 410075, China;
2. Hunan Xupu-Xuhuai Expressway Construction and Development Co., Ltd., Huaihua Hunan 418000, China
Abstract Based on the twin shear unified strength theory, the analytical equations for calculating stress, displacement, radius of plastic zone, and characteristic curve equation of surrounding rock in circular submarine tunnels were proposed under the condition of fluid-solid coupling. As the tunnel is usually located under high water pressure, the effective stress of surrounding rock will be reduced for high pore water pressure and seepage pressure according to the calculation results. This may bring about the arch formation and lower stability of strata. Moreover, intermediate principal stress has a certain influence on the stress, displacement, and radius of the plastic zone of surrounding rock. Hence, it is necessary that seepage and intermediate principal stress are rationally considered in the surrounding rock stability analysis and the lining structure design of submarine tunnels because this is beneficial for maximizing the strength of the surrounding rock. Selecting reasonable strength criterion of rock is the basis for correct analysis in rock mechanics and engineering. The results of this study may be applicable to actual situations in various engineering fields by choosing different coefficients of intermediate principal stress b and effective pore water pressure coefficient η. Further, these may provide a theoretical base and practical value for distinguishing the stability of surrounding rock; designing supporting structure and determining the area of pre-grouting submarine tunnels.
Fund:Supported by the National High-tech R&D Program of China (863 Program) (No.2007AA11Z134);the National Natural Science Foundation of China (No.51108175);and Hunan Provincial Natural Science Foundation of China (No.10JJ4035)
Corresponding Authors:
WANG You, ywang1920@hotmail.com
E-mail: ywang1920@hotmail.com
WANG You,WANG Xing-hua,CHEN Jun-ru. Elastoplastic Analysis of Surrounding Rocks of Submarine Tunnel with Consideration of Seepage[J]. Journal of Highway and Transportation Research and Development, 2013, 7(2): 73-80.
[1] HAGELIA P. Semi-quantitative Estimation of Water Shielding Requirements and Optimization of Rock Cover for Sub-sea Road Tunnels[J]. International Journal of Rock Mechanics and Mining Sciences and Geomechanics Abstracts,1995,32(3):485-492.
[2] PALMSTROM A,SKOGHEIM A. New Milestones in Sub-sea Blasting at Water Depth of 55 m[J]. Tunneling and Underground Space Technology,2000,15(1):65-68.
[3] ZHU Wei-shen, HE Man-chao. Stability and Dynamic Construction Mechanics of Surrounding Rock under Complex Condition[M]. Beijing:Science Press, 1995. (in Chinese)
[4] YU Xue-fu, ZHEN Yin-ren. Stability Analysis of Surrounding Rock in Underground Works[M]. Beijing:China Coal Industry Publishing House, 1983. (in Chinese)
[5] ZHANG You-tian, ZHANG Wu-gong, WANG Lei. The Second Discussion of Static Structure Calculation of Water Loads on Hydraulic Tunnel[J]. Journal of Hydraulic Engineering, 1985, (3),21-31. (in Chinese)
[6] ZHANG You-tian. External Water Pressure on Lining of Tunnels in Mountain Area[C]//Modern Tunnelling Science and Technology.[s.1.]:Swets & Zeitinges Publishers, 2001,551-556.
[7] REN Qing-wen, ZHANG Hong-chao. A modification of Fenner Formula[J]. Chinese Journal of Hohai University:Natrual Sciense Edition, 2001, 29(6):109-111. (in Chinese).
[8] BOBET A. Effect of Pore Water Pressure on Tunnel Support during Static and Seismic Loading[J]. Tunneling and Underground Space Technology,2003,18(4):377-393.
[9] RONG Chuan-xin, CHENG Hua. Stability Analysis of Rocks around Tunnel with Ground Water Permeation[J]. Chinese Journal of Rock Mechanics and Engineering, 2004, 23(5), 741-744. (in Chinese)
[10] LI Zong-li, REN Qing-wen, WANG Ya-hong. Elasto-plastic Analytical Solution of Deep-buried Circle Tunnel Considering Fluid Flow Field[J]. Chinese Journal of Rock Mechanics and Engineering, 2004, 23(8), 1291-1295. (in Chinese)
[11] WANG Xiu-ying. Research on External Water Pressure on Lining Plugging Emission Limitation and Its Structure Design in Karst Tunnel[D]. Beijing:Beijing Jiaotong University, 2005. (in Chinese)
[12] HUANG Pu-ming. Research on Stability of Surrounding Rock and Mechanical Characteristics of Supporting Structure in Bored Submarine Tunnel[D]. Beijing:Beijing Jiaotong University, 2005. (in Chinese)
[13] YU Mao-hong, HE Li-nan. A New Model and Theory on Yield and Failure of Materials under Complex Stress State[M]. Oxford:Pergamon Press, 1991:841-846.
[14] YU Mao-hong. Advances in Strength Theories for Materials under Complex Stress State in the 20th Century[J]. Applied Mechanics Reviews, 2002, 55(3):169-218.
[15] YU Mao-hong. Twin Shear Theory and Its Application[M]. Beijing:Science Press, 1998.(in Chineae)
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