Effect of soil disturbance on consolidation by prefabricated vertical drains installed in a rectangular pattern

被引：10
作者：
Basu D. [1 ]
Prezzi M. [2 ]
Madhav M.R. [3 ]
机构：
[1] Department of Civil and Environmental Engineering, University of Connecticut, Storrs, CT 06269, 261 Glenbrook Road
[2] School of Civil Engineering, Purdue University, West Lafayette, IN 47907
[3] J.N. Technical University
来源：
Geotechnical and Geological Engineering | 2010年 / 28卷 / 1期
关键词：
Consolidation; Finite element analysis; Ground improvement; Prefabricated vertical drain; Smear; Soil disturbance;
D O I：
10.1007/s10706-009-9279-7
中图分类号：
学科分类号：
摘要：
In this paper, the effect of soil disturbance caused by installation of prefabricated vertical drains (PVDs) on the rate of consolidation is studied by two-dimensional finite element analysis. A transition zone lying between the highly disturbed smear and the undisturbed zones is considered in the analysis. The hydraulic conductivity in the transition zone is assumed to vary linearly from a low value in the smear zone to the original in situ value in the undisturbed zone. The analysis uses the actual band shape of the PVD and the rectangular shape of the unit cell. A parametric study is carried out to investigate the effects of the degree of soil disturbance, the size of the smear and the transition zones, the PVD spacing and the mandrel size and shape. Design guidelines, where the smear and transition zones are replaced by an expanded smear zone producing the same effect, are provided so that existing analytical solutions considering only the smear zone can be used for analysis and design. A comparison with experimental results shows that consideration of the transition zone is important for correct estimation of the degree of consolidation. © Springer Science+Business Media.
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页码：61 / 77
页数：16
相关论文
共 48 条
  • [1] Akagi T., Effect of mandrel-driven sand drains on strength, Proceedings of the 9th International Conference On Soil Mechanics and Foundation Engineering, 1, pp. 3-6, (1977)
  • [2] Akagi T., Hydraulic applications of geosynthetics to some filtration and drainage problems with special reference to prefabricated band-shaped drains, Proceedings of the 5th International Conference On Geotextiles Geo-membranes and Related Products, Singapore, pp. 1339-1359, (1994)
  • [3] (2005)
  • [4] Atkinson M.S., Eldred P.J.L., Consolidation of soil using vertical drains, Vertical Drains, pp. 33-43, (1982)
  • [5] Barron R.A., Consolidation of fine-grained soils by drain wells, Transactions of the American Society of Civil Engineers, 113, pp. 718-742, (1948)
  • [6] Basu D., Basu P., Prezzi M., Analytical solutions for consolidation aided by vertical drains, Geomech Geoeng Int J, 1, 1, pp. 63-71, (2006)
  • [7] Bergado D.T., Asakami H., Alfaro M.C., Balasubramaniam A.S., Smear effects of vertical drains on soft Bangkok clay, J Geotech Eng Am Soc Civil Eng, 117, 10, pp. 1509-1530, (1991)
  • [8] Bergado D.T., Alfaro M.C., Balasubramaniam A.S., Improvement of soft Bangkok clay using vertical drains, Geotext Geomembr, 12, pp. 615-663, (1993)
  • [9] Bergado D.T., Mukherjee K., Alfaro M.C., Balasubramaniam A.S., Prediction of vertical-band-drain performance by the finite-element method, Geotext Geomembr, 12, pp. 567-586, (1993)
  • [10] Bergado D.T., Anderson L.R., Miura N., Balasubramaniam A.S., Prefabricated vertical drains (PVD), Soft Ground Improvement In Lowland and Other Environments, Ch, 4, pp. 88-185, (1996)
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