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On-line Access: 2009-11-30

Received: 2009-02-09

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Journal of Zhejiang University SCIENCE A 2010 Vol.11 No.1 P.9-17

10.1631/jzus.A0900069


Direct and relaxation methods for soil-structure interaction due to tunneling


Author(s):  Assaf KLAR, Itai ELKAYAM

Affiliation(s):  Faculty of Civil and Environmental Engineering, Technion-Israel Institute of Technology, Haifa 32000, Israel

Corresponding email(s):   klar@technion.ac.il

Key Words:  Tunneling, Soil-structure interaction, Foundation settlements, Excavations, Soil mechanics


Assaf KLAR, Itai ELKAYAM. Direct and relaxation methods for soil-structure interaction due to tunneling[J]. Journal of Zhejiang University Science A, 2010, 11(1): 9-17.

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author="Assaf KLAR, Itai ELKAYAM",
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%A Itai ELKAYAM
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%DOI 10.1631/jzus.A0900069

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T1 - Direct and relaxation methods for soil-structure interaction due to tunneling
A1 - Assaf KLAR
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PB - Zhejiang University Press & Springer
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Abstract: 
This paper deals with the problem of tunneling effects on existing buildings. The direct solution, using the condensation method, is presented. This method allows the structural and geotechnical engineers to treat the problem separately and then assemble a relatively small matrix that can be solved directly, even within a spreadsheet. There are certain concerns that the resultant matrix may be ill-conditioned when the structure is very stiff. This paper suggests an alternative method that essentially relaxes the system from an infinitely rigid structure solution. As such, it does not encounter the problems associated with stiff systems. The two methods are evaluated for an example problem of tunneling below a framed structure. It is found that while the direct method may fail to predict reasonable values when the structure is extremely rigid, the alternative method is stable. The relaxation method can therefore be used in cases where there are concerns about the reliability of a direct solution.

Darkslateblue:Affiliate; Royal Blue:Author; Turquoise:Article

Reference

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[6] Klar, A., Vorster, T.E.B., Soga, K., Mair, R.J., 2007. Elastoplastic solution for soil-pipe-tunnel interaction. Journal of Geotechnical and Geoenvironmental Engineering, 133(7): 782-792.

[7] Klar, A., Marshall, A.M., Soga, K., Mair, R.J., 2008. Tunnelling effects on jointed pipeline. Canadian Geotechnical Journal, 45(1):131-139.

[8] LUSAS, 2007. LUSAS Ver. 14–User Manual. LUSAS, London.

[9] Mair, R.J., Taylor, R.N., Bracegirdle, A., 1993. Subsurface settlement profiles above tunnels in clays. Geotechnique, 43(2):315-320.

[10] Oasys, 2007. Oasys-GSA Ver 8.2–User Manual. Oasys Limited, London.

[11] Plaxis, 2006. Plaxis ver 8.0–User Manual. Plaxis, Delft.

[12] Potts, D.M., Addenbrooke, T.I., 1997. A structure’s influence on tunnelling-induced ground movements. Proceedings of the Institution of Civil Engineers Geotechnical Engineering, 125(2):109-125.

[13] Poulos, H.G., Davis, E.H., 1974. Elastic Solutions for Soil and Rock Mechanics. Wiley and Sons, New York.

[14] Weaver, W., Johnston, P.R., 1987. Structural Dynamics by Finite Elements. Prentice Hall, New Jersey.

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