Geomechanics and Engineering

Techno-Press (테크노프레스)
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Optimum PVD installation depth for two-way drainage deposit

  • Chai, J.C. (Department of Civil Engineering, Saga University) ;
  • Miura, N. (Institute of Soft Ground Engineering, Co., Ltd.) ;
  • Kirekawa, T. (Institute of Soft Ground Engineering, Co., Ltd.) ;
  • Hino, T. (Institute of Lowland Technology, Saga University)
  • Received : 2009.05.19
  • Accepted : 2009.06.29
  • Published : 2009.09.25
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Abstract

For a two-way drainage deposit under a surcharge load, it is possible to leave a layer adjacent to the bottom drainage boundary without prefabricated vertical drain (PVD) improvement and achieve approximately the same degree of consolidation as a fully penetrated case. This depth is designated as an optimum PVD installation depth. Further, for a two-way drainage deposit under vacuum pressure, if the PVDs are fully penetrated through the deposit, the vacuum pressure will leak through the bottom drainage boundary. In this case, the PVDs have to be partially penetrated, and there is an optimum installation depth. The equations for calculating these optimum installation depths are presented, and the usefulness of the equations is studied by using finite element analysis as well as laboratory model test results.

Keywords

References

  1. Bergado, D.T., Manivannan, R. and Balasubramaniam, A.S. (1996), "Proposed criteria for discharge capacity of prefabricated vertical drains", Geotext. Geomembranes, 14, 481-505. https://doi.org/10.1016/S0266-1144(96)00028-3
  2. Carrillo, N. (1942), "Simple two and three dimensional cases in the theory of consolidation of soils", J. Math. Phys., 21, 1-5. https://doi.org/10.1002/sapm19422111
  3. Chai, J.C. and Miura, N. (1999), "Investigation of factors affecting vertical drain behavior", J. Geotech. Geoenviron. Eng., ASCE, 125(3), 216-226. https://doi.org/10.1061/(ASCE)1090-0241(1999)125:3(216)
  4. Chai, J.C., Shen, S.L., Miura, N. and Bergado, D.T. (2001), "Simple method of modeling PVD improved subsoil", J. Geotech. Geoenviron. Eng., ASCE, 127(11), 65-972.
  5. Chai, J.C., Carter, J.P. and Hayashi, S. (2005), "Ground deformation induced by vacuum consolidation", J. Geotech. Geoenviron. Eng., ASCE, 31(12), 1552-1561.
  6. Chai, J.C., Carter, J.P. and Hayashi, S. (2006), "Vacuum consolidation and its combination with embankment loading", Can. Geotech. J., 43(10), 985-996. https://doi.org/10.1139/t06-056
  7. Chai, J.C., Miura, N. and Nomura, T. (2007), "Experimental investigation on optimum installation depth of PVD under vacuum consolidation", Proceedings of the 3rd Sino-Japan Geotechnical Symposium, Chongqing, 87-94.
  8. Hansbo, S. (1981), "Consolidation of fine-grained soils by prefabricated drains", Proceedings of the 10th International Conference on Soil Mechanics and Foundation Engineering, Stockholm, June, 677-682.
  9. Roscoe, K.H. and Burland, J.B. (1968), On the generalized stress-strain behaviour of 'wet' clay, Engineering Plasticity (Eds. Heyman, J. and Leckie, F. A.), Cambridge University Press, 535-609.
  10. Taylor, D.W. (1948), Fundamentals of Soil Mechanics, John Wiley & Sons Inc. New York.

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