Geomechanics and Engineering

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Experimental investigation of lateral displacement of PVD-improved deposit

  • Chai, Jin-Chun (Department of Civil Engineering and Architecture, Saga University) ;
  • Xu, Fang (Department of Civil Engineering and Architecture, Saga University)
  • Received : 2014.10.16
  • Accepted : 2015.05.20
  • Published : 2015.11.25
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Abstract

Laboratory model tests were conducted to investigate the effect of surcharge loading rate on the magnitude of lateral displacement of prefabricated vertical drains (PVDs) improved deposit. The test results indicate that under the condition that the system had sufficient factor of safety (FS) ($FS{\geq}1.2$), for the similar model ground under the same total applied surcharge load, the lateral displacement increases with the increase of loading rate. The test results have been used to check the validity of a previously proposed method for predicting the maximum lateral displacement, and it shows that the data points are around the middle line of the predicted range, which supports the usefulness of the proposed method. The basic idea of the prediction method is an empirical relationship between the normalized lateral displacement (NLD) and a ration of load to the undrained shear strength of the deposit (RLS). The model test results offer some modifications of the NLD-RLS relationship: (1) instead of a bilinear relationship, NLD-RLS relationship may be entirely nonlinear; (2) the upper bound value of RLS for the proposed method can be used may be limited to 2.1 instead of the originally proposed value of 3.0.

Keywords

References

  1. Asha, B. and Mandal, J. (2012), "Absorption and discharge capacity tests on natural prefabricated vertical drains", Geosynth. Int., 19(4), 263-271. https://doi.org/10.1680/gein.12.00013
  2. Boussinesq, J. (1885), Application des Potentials a L'Etude de L'Equilibre et du Mouvement des Solides Elastiques, Gauthier-Villars, Paris, France. [In French]
  3. Cascone, E. and Biondi, G. (2013), "A case study on soil settlements induced by preloading and vertical drains", Geotext. Geomembr., 38, 51-67. https://doi.org/10.1016/j.geotexmem.2013.05.002
  4. Chai, J.-C. and Miura, N. (2002), "Long-term transmissivity of geotextile confined in clay", Proceedings of the 7th International Conference on Geosynthetics, Nice, France, Volume 1, September, pp. 155-158.
  5. Chai, J.-C., Ong, C.Y., Bergado, D.T. and Carter, J.P. (2013), "Lateral displacement under combined vacuum pressure and embankment loading", Geotechnique, 63(10), 842-856. https://doi.org/10.1680/geot.12.P.060
  6. Cowland, J. and Wong, S. (1993), "Performance of a road embankment on soft clay supported on a geocell mattress foundation", Geotext. Geomembr., 12(8), 687-705. https://doi.org/10.1016/0266-1144(93)90046-Q
  7. Hansbo, S. (1981), "Consolidation of fine-grained soils by prefabricated drains", Proceedings of the 10th International Conference on Soil Mechanics and Foundation Engineering, Stockholm, Sweden, June, Volume 3, pp. 677-682.
  8. Howell, R., Rathje, E. and Boulanger, R. (2014), "Evaluation of simulation models of lateral spread sites treated with prefabricated vertical drains", J. Geotech. Geoenviron. Eng., 141(1), 04014076. https://doi.org/10.1061/(ASCE)GT.1943-5606.0001185
  9. Hu, Y., Zhou, W.-H. and Cai, Y. (2014), "Large-strain elastic visco-plastic consolidation analysis of very soft clay layers with vertical drains under preloading", Can. Geotech. J., 51(2), 144-157. https://doi.org/10.1139/cgj-2013-0200
  10. Karim, M.R. and Lo, S.-C. (2015), "Estimation of the hydraulic conductivity of soils improved with vertical drains", Comput. Geotech., 63, 299-305. https://doi.org/10.1016/j.compgeo.2014.10.010
  11. Kelln, C., Sharma, J., Hughes, D. and Gallagher, G. (2007), "Deformation of a soft estuarine deposit under a geotextile reinforced embankment", Can. Geotech. J., 44(5), 603-617. https://doi.org/10.1139/t07-007
  12. Kim, H.J., Lee, K.H., Jamin, J.C. and Mission, J.L.C. (2014), "Stochastic cost optimization of ground improvement with prefabricated vertical drains and surcharge preloading", Geomech. Eng., Int. J., 7(5), 525-537. https://doi.org/10.12989/gae.2014.7.5.525
  13. Ladd, C.C. (1991), "Stability evaluation during staged construction", J. Geotech. Eng. ASCE, 117(4), 540-615. https://doi.org/10.1061/(ASCE)0733-9410(1991)117:4(540)
  14. Loganathan, N., Balasubramaniam, A.S. and Bergado, D.T. (1993), "Deformation analysis of embankments". J. Geotech. Eng. ASCE, 119(8), 1185-1206. https://doi.org/10.1061/(ASCE)0733-9410(1993)119:8(1185)
  15. Ong, C.Y. and Chai, J.-C. (2011), "Lateral displacement of soft ground under vacuum pressure and surcharge load", Front. Arch. Civil Eng. China, 5(2), 239-248. https://doi.org/10.1007/s11709-011-0110-1
  16. Ong, C.Y. (2011), "Prediction of lateral displacement of ground induced by surcharge load and vacuum pressure", Ph.D. Dissertation; Saga University, Saga, Japan.
  17. Osterberg, J.O. (1957), "Influence values for vertical stresses in a semi-infinite mass due to an embankment loading", Proceedings of the 4th Intornational Conference Soil Mechanics and Foundation Engineering, London, UK, August ,Volume 1, pp. 393-394.
  18. Parsa-Pajouh, A., Fatahi, B., Vincent, P. and Khabbaz, H. (2014), "Analyzing consolidation data to predict smear zone characteristics induced by vertical drain installation for soft soil improvement", Geomech. Eng., Int. J., 7(1), 105-131. https://doi.org/10.12989/gae.2014.7.1.105
  19. Rujikiatkamjorn, C., Ardana, M., Indraratna, B. and Leroueil, S. (2013), "Conceptual model describing smear zone caused by mandrel action", Geotechnique, 63(16), 1377-1388. https://doi.org/10.1680/geot.12.P.138
  20. Smadi, M.M. (2001), "Lateral deformation and associated settlement resulting from embankment loading of soft clay and silt deposits", Ph.D. Dissertation; University of Illinois, Urbana-Champaign, IL, USA.
  21. Tan, S.A. (1995), "Validation of hyperbolic method for settlement in clays with vertical drains", Soils Found., 35(1), 101-113. https://doi.org/10.3208/sandf1972.35.101
  22. Tan, S.-A. and Chew, S.-H. (1996), "Comparison of the hyperbolic and Asaoka observational method of monitoring consolidation with vertical drains", Soils Found., 36(3), 31-42. https://doi.org/10.3208/sandf.36.3_31
  23. Tavenas, F. and Leroueil, S. (1980), "The behaviour of embankments on clay foundations", Can. Geotech. J., 17(2), 236-260. https://doi.org/10.1139/t80-025
  24. Xu, F. and Chai, J-C. (2014), "Lateral displacement of PVD-improved deposit under embankment loading", Geosynth. Int., 21(5), 286-300. https://doi.org/10.1680/gein.14.00016

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