Laboratory Study on Pore Pressure Generation and Liquefaction of Low-Plasticity Silty Sandy Soils during the 2012 Earthquake in Italy
Publication: Journal of Geotechnical and Geoenvironmental Engineering
Volume 142, Issue 10
Abstract
This paper describes the results of a laboratory investigation performed on clean sand and low-plasticity silty sands, recovered at different locations of the bank stretch at Scortichino, which was affected by serious damages following the 2012 Emilia Romagna earthquake in Italy. A comprehensive cyclic simple shear (CSS) testing program was undertaken to evaluate the liquefaction potential and pore pressure response of silty sand layers, which form the subsoil at the site. A series of undrained CSS tests were carried out on undisturbed samples by applying an initial static driving shear stress before cyclic loading (nonsymmetrical tests), with the aim of gaining a better understanding of the role played by a static preshearing on the observed liquefaction phenomena. The results obtained prove that, in nonsymmetrical cyclic loading tests, low-plasticity silty sands tend to be more susceptible to liquefaction than in symmetrical cyclic loading tests. The onset of liquefaction occurs by large shear strains, and not by complete loss of effective stress resulting from the pore pressure buildup.
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Acknowledgments
Part of the laboratory tests of this research was funded by the Emilia Romagna region of Italy, whose support is gratefully appreciated. The authors also wish to acknowledge the valid contribution provided by Dr. Luca Paviglianiti, who performed the numerical analyses with PLAXIS code, and by Dr. Salvatore Santangelo, who carried out comparative seismic response analyses with QUAD4M and LSR 2D FEM codes.
References
Amini, F., and Qi, G. Z. (2000). “Liquefaction testing of stratified silty sands.” J. Geotech. Geoenviron. Eng., 208–217.
Baziar, M. H., Shahnazari, H., and Sharafi, H. (2011). “A laboratory study on the pore pressure generation model for Firouzkooh silty sands using hollow torsional test.” Int. J. Civ. Eng., 9(2), 126–134.
Booker, J. R., Rahman, M. S., and Seed, H. B. (1976). “GADFLEA—A computer program for the analysis of pore pressure generation and dissipation during cyclic or earthquake loading.”, Earthquake Engineering Research Center, Univ. of California, Berkeley, CA.
Boulanger, R. W., and Idriss, I. M. (2004). “ Evaluating the potential for liquefaction or cyclic failure of silts and clays.”, Center for Geotechnical Modeling, Dept. of Civil and Environmental Engineering, Univ. of California, Davis, CA.
Boulanger, R. W., and Idriss, I. M. (2005). “New criteria for distinguishing between silts and clays that are susceptible to liquefaction versus cyclic failure.” Proc., Technologies to Enhance Dam Safety and the Environment, 25th Annual United States Society on Dams Conf., U.S. Society on Dams, Denver, 357–366.
Boulanger, R. W., and Idriss, I. M. (2006). “Liquefaction susceptibility criteria for silts and clays.” J. Geotech. Geoenviron. Eng., 1413–1426.
Brinkgreve, R. B. J., and Vermeer, P. A. (2002). PLAXIS-finite element code for soil and rock analysis, A. A. Balkema, Rotterdam, Netherlands.
Dash, H. K., and Sitharam, T. G. (2009). “Undrained cyclic pore pressure response of sand-silt mixtures: Effect of non plastic fines and other parameters.” J. Geotech. Geol. Eng., 27(4), 501–517.
Dash, H. K., and Sitharam, T. G. (2011). “Undrained cyclic and monotonic strength of sand-silt mixtures.” J. Geotech. Geol. Eng., 29(4), 555–570.
Dash, H. K., Sitharam, T. G., and Baudet, B. A. (2010). “Influence of non-plastic fines on the response of a silty sand to cyclic loading.” Soils Found., 50(5), 695–704.
De Alba, P., Chan, C. K., and Seed, H. B. (1975). “Determination of soil liquefaction characteristics by large-scale laboratory tests.”, Earthquake Engineering Research Center, Univ. of California, Berkeley, CA.
Dobry, R., Ladd, R. S., Yokel, F. Y., Chung, R. M., and Powell, D. (1982). “Prediction of pore-water pressure buildup and liquefaction of sands during earthquakes by the cyclic strain method.” National Bureau of Standards, U.S. Dept. of Commerce, Washington, DC.
Dyvik, R., Berre, T., Lacasse, S., and Raadim, B. (1987). “Comparison of truly undrained and constant volume direct simple shear tests.” Geotechnique, 37(1), 3–10.
Finn, W. D. L. (1985). “Aspects of constant volume cyclic simple shear.” Proc., Advances in the Art of Testing Soils under Cyclic Conditions, ASCE, Reston, VA, 74–98.
Finn, W. D. L. (1988). “Dynamic analysis in geotechnical engineering.” Proc., Earthquake Engineering and Soil Dynamics II: Recent Advances in Ground-Motion Evaluation, ASCE, Reston, VA, 523–591.
Fioravante, V., et al. (2013). “Earthquake geotechnical engineering aspects of the 2012 Emilia-Romagna earthquake (Italy).” Proc., 7th Int. Conf. on Case Histories in Geotechnical Engineering, Missouri Univ. of Science and Technology, Rolla, MO, 1–34.
Ghionna, V. N., and Porcino, D. (2006). “Liquefaction resistance of undisturbed and reconstituted samples of a natural coarse sand from undrained cyclic triaxial tests.” J. Geotech. Geoenviron. Eng., 194–202.
Green, R. A., Olson, S. M., and Polito, C. P. (2006). “A comparative study of the influence of fines on the liquefaction susceptibility of sands: Field versus laboratory.” Proc., 8th National Conf. on Earthquake Engineering, Earthquake Engineering Research Institute, Oakland, CA.
Hazirbaba, K. (2005). “Pore pressure generation characteristics of sands and silty sands: A strain approach.” Ph.D. thesis, Univ. of Texas, Austin, TX.
Hazirbaba, K., and Rathje, E. M. (2009). “Pore pressure generation of silty sands due to induced cyclic shear strains.” J. Geotech. Geoenviron. Eng., 1892–1905.
Hudson, M., Idriss, I. M., and Beikae, M. (1994). QUAD4M—A computer program to evaluate the seismic response of soil structures using finite element procedures and incorporating a compliant base, Center for Geotechnical Modeling, Dept. of Civil and Environmental Engineering, Univ. of California, Davis, CA.
Idriss, I. M., and Boulanger, R. W. (2003). “Estimating for use in evaluating cyclic resistance of sloping ground.” Proc., 8th US-Japan Workshop on Earthquake Resistant Design of Lifeline Facilities and Countermeasures against Liquefaction, M. Hamada, T. D. O’Rourke, and J. P. Bardet, eds., Multidisciplinary Center for Earthquake Engineering Research, Buffalo, NY, 449–468.
Kokusho, T., Ito, F., Nagao, Y., and Green, A. (2012). “Influence of non/low-plastic fines and associated aging effects on liquefaction resistance.” J. Geotech. Geoenviron. Eng., 747–756.
Lee, W. F., Ishihara, K., and Chen, C.-C. (2012). “Liquefaction of silty sand—preliminary studies from recent Taiwan, New Zealand and Japan earthquakes.” Proc., Int. Symp. on Engineering Lessons Learned from the 2011 Great East Japan Earthquake, Japan Associaton for Earthquake Engineering, Tokyo.
Polito, C. P. (1999). “The effects of non-plastic and plastic fines on the liquefaction of sandy soils.” Ph.D. thesis, Virginia Polytechnic Institute and State Univ., Blacksburg, VA.
Polito, C. P., Green, R. A., and Lee, J. (2008). “Pore pressure generation models for sands and silty soils subjected to cyclic loading.” J. Geotech. Geoenviron. Eng., 1490–1500.
Polito, C. P., and Martin, J. R. (2001). “Effects of non plastic fines on the liquefaction resistance of sands.” J. Geotech. Geoenviron. Eng., 408–415.
Porcino, D., Caridi, G., Malara, M., and Morabito, E. (2006). “An automated control system for undrained monotonic and cyclic simple shear tests.” Proc., Geotechnical Engineering in the Information Technology Age, ASCE, Reston, VA, 1–6.
Rahhala, M. E., and Lefebvre, G. (2000). “Understanding the effect of a static driving shear stress on the liquefaction resistance of medium dense granular soils.” Soil Dyn. Earthquake Eng., 20(5–8), 397–404.
Rahman, M. M., and Lo, S. R. (2008). “The prediction of equivalent granular steady state line of loose sand with fines.” Geomech. Geoeng., 3(3), 179–190.
Ravishankar, B. (2006). “Cyclic and monotonic undrained behaviour of sandy soils.” Ph.D. thesis, Indian Institute of Science, Bangalore, India.
Seed, H. B. (1983). “Earthquake resistant design of earth dams.” Proc., Symp. on Seismic Design of Embankments and Caverns, ASCE, Reston, VA, 41–64.
Seed, H. B., and Idriss, I. M. (1971). “Simplified procedure for evaluating soil liquefaction potential.” J. Soil Mech. Found. Div., 97(9), 1249–1273.
Seed, H. B., and Idriss, I. M. (1982). “Ground motions and soil liquefaction during earthquakes.” EERI monograph, Earthquake, Engineering Research Institute, Berkeley, CA.
Seed, H. B., Martin, G. R., and Pyke, R. M. (1978). “Effects of multidirectional shaking on pore pressure development in sands.” J. Geotech. Eng. Div., 104(1), 27–44.
Seed, H. B., Martin, P. P., and Lysmer, J. (1975). “The generation and dissipation of pore water pressures during soil liquefaction.”, Earthquake Engineering Research Center, Univ. of California, Berkeley, CA.
Seed, R. B., et al. (2003). “Recent advances in soil liquefaction engineering: A unified and consistent framework.”, Earthquake Engineering Research Center, Univ. of California, Berkeley, CA.
STACEC s.r.l. (2013). “User manual local seismic response 2D (LSR2D).” 〈http://stacec.it/Manuals/LSR2D%20User%20Manual.pdf〉 (Jan. 26, 2016).
Thevanayagam, S. (2000). “Liquefaction potential and undrained fragility of silty soils.” Proc., 12th Int. Conf. on Earthquake Engineering, R. Park, ed., New Zealand Society of Earthquake Engineering, Upper Hutt, New Zealand, 1–8.
Thevanayagam, S., Shenthan, T., Mohan, S., and Liang, J. (2002). “Undrained fragility of clean sands, silty sands, and sandy silts.” J. Geotech. Geoenviron. Eng., 849–859.
Tonni, L., et al. (2015a). “Interpreting the deformation phenomena triggered by the 2012 Emilia seismic sequence on the Canale Diversivo di Burana banks (Analisi dei fenomeni deformativi indotti dalla sequenza sismica emiliana del 2012 su un tratto di argine del Canale Diversivo di Burana (FE)).” Ital. Geotech. J., 49(2), 28–58.
Tonni, L., et al. (2015b). “SDMT-based site characterization and liquefaction analysis of canal levees damaged by the 2012 Emilia (Italy) seismic sequence.” Proc., DMT’15 3rd Int. Conf. on the Flat Dilatometer, S. Marchetti, P. Monaco, and A. Viana da Fonseca, eds., Rome, 341–348.
Xenaki, V. C., and Athanasopoulos, G. A. (2003). “Liquefaction resistance of sand-silt mixtures: An experimental investigation of the effect of fines.” Soil Dyn. Earthquake Eng., 23(3), 1–12.
Yusa, M. (2015). “Aging and creep of non-plastic silty sand.” Ph.D. thesis, Dept. of Civil and Natural Resources Engineering, Univ. of Canterbury, Christchurch, New Zealand.
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Journal of Geotechnical and Geoenvironmental Engineering
Volume 142 • Issue 10 • October 2016
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© 2016 American Society of Civil Engineers.
History
Received: Apr 12, 2015
Accepted: Feb 11, 2016
Published online: May 25, 2016
Published in print: Oct 1, 2016
Discussion open until: Oct 25, 2016
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