Abstract
The present research is concerned with predicting liquefaction potential and pore water pressure under the dynamic loading on fully saturated sandy soil using the finite element method by QUAKE/W computer program. As a case study, machine foundations on fully saturated sandy soil in different cases of soil densification (loose, medium and dense sand) are analyzed. Harmonic loading is used in a parametric study to investigate the effect of several parameters including: the amplitude frequency of the dynamic load. The equivalent linear elastic model is adopted to model the soil behaviour and eight node isoparametric elements are used to model the soil. Emphasis was made on zones at which liquefaction takes place, the pore water pressure and vertical displacements develop during liquefaction. The results showed that liquefaction and deformation develop fast with the increase of loading amplitude and frequency. Liquefaction zones increase with the increase of load frequency and amplitude. Tracing the propagation of liquefaction zones, one can notice that, liquefaction occurs first near the loading end and then develops faraway. The soil overburden pressure affects the soil liquefaction resistance at large depths. The liquefaction resistance and time for initial liquefaction increase with increasing depths. When the frequency changes from 5 to 10 rad/sec. (approximately from static to dynamic), the response in displacement and pore water pressure is very pronounced. This can be attributed to inertia effects. Further increase of frequency leads to smaller effect on displacement and pore water pressure. When the frequency is low; 5, 10 and 25 rad/sec., the oscillation of the displacement ends within the period of load application 60 sec., while when ω = 50 rad/sec., oscillation continues after this period.
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References
Seed H. B., Cetin K.O., Moss R.E.S., Kammerer A.M., et al. Recent Advances in Soil Liquefaction Engineering, A Unified and Consistent Framework, 26th Annual ASCE, Los Angeles Geotechnical Spring Seminar, Keynote Presentation, H.M.S. Queen Mary, 2003
Youd T.L., and Idriss I.M., Liquefaction Resistance of Soils, Report from the NCEER, National Center for Earthquake Engineering, Workshops on Evaluation of Liquefaction Resistance of Soils”, Journal of Geotechnical and Geo-environmental Engineering, ASCE, April 2001, pp. 297–313
Wang W., Some Findings in Soil Liquefaction, Research Report, Water Conservancy, and Hydroelectric Power Scientific Research Institute, Beijing, August 1979
Sitharam T.G., Govinda Raju L. and Sridharan A., Dynamic Properties and Liquefaction Potential of Soils, Journal of Current Science, Vol. 87, No. 10, 25, November 2004
Jin D., Luan M., Li C., Liquefaction and Cyclic Loading, EJGE, Vol.13, Bund, G. 2008
Worthen D., Critical State Framework and Liquefaction of Fine-Grained Soils, M.Sc. Thesis, Department of Civil and Environmental Engineering, University of Washington State, 2009
Lu X., Zhang X. and Shi Z., Responses of Saturated Sand Surrounding a bucket Foundation under Horizontal Vibration Loading, The Open Ocean Engineering Journal, Vol. 3, 2010, pp 31–37
Fattah M.Y., Nsaif M. H., Propagation of Liquefaction Zones Due to Earthquake Excitation in a Zoned Earthdam, the 2nd Regional Conference for Engineering Sciences. /College. of Eng. / Al-Nahrain University /1–2/12/2010, 2010, pp. 509–530
Vivek P., and Gosh P., Dynamic Interaction of Two nearby Machine Foundation on Homogeneous Soil”, GeoCongress 2012, ASCE, 2012, pp. 21–30
Seed H.B., Martin P.P. and Lysmer J., Pore-Water Pressure Changes during Soil Liquefaction”, Journal of the Geo-technical Engineering Division, ASCE, GT4, 1976, pp.323–345
Kumar K., Basic Geotechnical Earthquake Engineering, New Age International, 2008
Wang Y., Lu X., Wang S. and Shi Z., The Response of Bucket Foundation under Horizontal Dynamic Loading, The Open Ocean Engineering Journal, Vol.33, 2006, pp 964–973
Fattah M.Y., Al-Neami M. A., Jajjawi N. H., Implementation of Finite Element Method for Prediction of Soil Liquefaction around Underground Structure, Engineering and Technology Journal, University of Technology, Vol. 31, No. 4, 2013, pp. 703–714
Amini F., Duan Z., Centrifuge and Numerical Modeling of Soil Liquefaction at Very large Depths, 15th ASCE Engineering Mechanics Conference, Columbia University New York, NY, 2002.
Manual of Dynamic Modeling with QUAKE/W, 2007 (2009). An Engineering Methodology, 4th Edition, Geo-Slope International, Ltd.
Seed H.B., Idress I.M., Soil Moduli and Damping Factors for Dynamic Analysis, EERC Report No. 10-70, University of California, 1970
Seed H.B., and Booker J.R., Stabilization of Potentially Liquefiable Sand Deposits Using Giravel Drains, Journal of Geotechnical Engineering Division, ASCE, Vol. 103, No., GT7, 1977, pp.757–768.
Kramer S.L., Geotechnical Earthquake Engineering, Prentice Hall, 1996.
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Fattah, M.Y., Al-Neami, M.A. & Jajjawi, N.H. Prediction of liquefaction potential and pore water pressure beneath machine foundations. cent.eur.j.eng 4, 226–249 (2014). https://doi.org/10.2478/s13531-013-0165-y
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DOI: https://doi.org/10.2478/s13531-013-0165-y