Abstract
In order to observe the end of primary consolidation (EOP) of cohesive soils with and without subjecting to cyclic loading, reconstituted specimens of clayey soils at various Atterberg’s limits were used for oedometer test at different loading increments and undrained cyclic shear test followed by drainage with various cyclic shear directions and a wide range of shear strain amplitudes. The pore water pressure and settlement of the soils were measured with time and the time to EOP was then determined by different methods. It is shown from observed results that the time to EOP determined by 3-t method agrees well with the time required for full dissipation of the pore water pressure and being considerably larger than those determined by Log Time method. These observations were then further evaluated in connection with effects of the Atterberg’s limit and the cyclic loading history.References
- Mesri G., Godlewski P. M. Time and stress-compressibility interrelationship. Journal of the Geotechnical Engineering Division, ASCE, Vol. 103(GT), page 417-430, USA, 1977.
- Yasuhara K. A practical model for secondary compression. Soils and Foundations, Vol 22(4), page 45-56, Japan, 1982.
- Nhan, T. T., Matsuda, H., Sato, H. A model for multi-directional cyclic shear-induced pore water pressure and settlement on clays. Bulletin of Earthquake Engineering, Vol. 15(7), page 2761-2784, Netherlands.
- Yasuhara K., Andersen K. H. Recompression of normally consolidated clay after cyclic loading. Soils and Foundations, Vol. 31(1), page 83-94, Japan, 1991.
- Hyde, A. F. L., Yasuhara, K., Hirao, K. Stability criteria for marine clay under one-way cyclic loading. Journal of Geotechnical Engineering ASCE, Vol. 119 (11), page 1771-1788, USA, 1993.
- Ohara, S., Matsuda, H. Study on the settlement of saturated clay layer induced by cyclic shear. Soils and Foundations, Vol. 28(3), page 103-113, Japan, 1988.
- Fujiwara H., Yamanouchi T., Yasuhara K., Ue S. Consolidation of alluvial clay under repeated loading. Soils and Foundations, Vol. 25(3), page 19-30, Japan, 1985.
- Matsuda H., Shimizu Y. Laboratory tests of cyclic-load consolidation. Proceedings of the 11th European Conference on Soil Mechanics and Foundation Engineering, Vol. 3, page 179-184, 1995.
- Nhan, T. T., Matsuda, H., Hara, H., Sato, H. Normalized pore water pressure ratio and post-cyclic settlement of saturated clay subjected to undrained uni-directional and multi-directional cyclic shears. 10th Asian Regional Conference of IAEG, Paper No. Tp3-16-1081481, page 1-6, Kyoto - Japan, 2015.
- Vucetic, M. A., Dobry, R. Effect of soil plasticity on cyclic response. Journal of Geotechnical Engineering, ASCE, Vol. 117, page 89-107, USA, 1991.
- TCVN 4200:2012. Soils - Laboratory methods for determination of compressibility. Ministry of Science and Technology, Ha Noi, 2012.
- JIS A1217. Test method for one-dimensional consolidation properties of soils using incremental loading, Laboratory testing standards for geomaterials, Japanese Geotechnical Engineering, Tokyo, 2000.
- ASTM D2435. One-dimensional consolidation properties of soils using incremental loading references. American Society for testing and materials, Pennsylvania, 1996.
- Casagrande, A. The determination of the pre-consolidation load and its practical significance. Proceedings of the first international conference on soil mechanics, Vol. 3, page 60-64, Havard, 1936.
- Germaine J. T., Germaine A. V. Geotechnical laboratory measurements for engineers, John Wiley & Sons, Inc., 351 pages, New Jersey, USA, 2009.
- Nhan T. T. Study on excess pore water pressure and post-cyclic settlement of normally consolidated clay subjected to uniform and irregular cyclic shears. Doctoral dissertation, Yamaguchi University, 131 pages, Japan, 2013.
This work is licensed under a Creative Commons Attribution-ShareAlike 4.0 International License.
Copyright (c) 2020 Array