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http://dx.doi.org/10.7843/kgs.2007.23.10.5

Improvement of Consolidation Characteristics around PVD Using the Thermal Method  

Bergado, Dennes T. (School of Civil Engrg., Asian Institute of Technology)
Shin, Eun-Chul (Dept. of Civil & Environmental System Engrg., Univ. of Incheon)
Park, Jeong-Jun (Research Institute for Engirg. And Technology, Univ. of Incheon)
Publication Information
Journal of the Korean Geotechnical Society / v.23, no.10, 2007 , pp. 5-11 More about this Journal
Abstract
This paper is to investigate the removal of the smear at elevated temperatures. This study utilized both small cylinder cell and large consolidometer apparatus to investigate the combination of PVD with heat and without heat. Two types of heaters are used in this study. The heater drain made of copper tube is used for all tests except large consolidometer and flexible wire heater is used for large consolidometer. Specimens demonstrated volume contraction upon heat and without heat. This contraction is dependent on temperature magnitude. When the specimen is heated, the magnitude of settlements is higher and rate of consolidation is faster. After treatment using PVD combined without heat and with heat for undisturbed specimens the $C_h$ values obtained were $3.45m^2/yr$ and $3.83m^2/yr$, respectively, from $3.2m^2/yr$ before treatment. The $K_h/K_s$ ratios were 3 for the specimen without heat and 2 for the specimen with heat. Similarly, in reconstituted specimens without heat and with heat, the $C_h$ values were $2.1m^2/yr$ and $2.5m^2/yr$ with $K_h/K_s$ ratios of 1.75 and 1.5, respectively.
Keywords
Coefficient of consolidation; Heater drain; Thermal method; Undisturbed specimen;
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  • Reference
1 Asakami, H. (1988), The Smear Effect of Vertical Band Drains, M. Eng. Thesis No.GT-88-8, Asian Institute of Technology, Bangkok, Thailand
2 Asaoka, A. (1978), 'Observational procedure of settlement predictions', Soils and Foundations, Vol.18, No.4, pp.87-101   DOI
3 Hansbo, S. (1979), 'Consolidation of clay by band-shaped prefabricated drains', Ground Engrg., Vol.12, No.5, pp.16-25
4 Nayar, A. (1996), Electro-Osmotic Stabilization of Soft Bangkok Clays with and without Prefrabricated Vertical Drains, AIT Thesis No.GE-96-18, Bangkok, Thailand
5 Hansbo, S. (1987), 'Design aspects of vertical drains and lime column installations', Proceedings of the Ninth Southeast Asian Geotecnical Conference, Bangkok, Thailand, pp.1-12
6 Sharma, J.S., Xiao, D., (2000). 'Characterization of a smear zone around vertical drains by large-scale laboratory tests', Canadian Geotechnical Journal, Vol.37, pp.1265-1271   DOI
7 Hird, C.C., Moseley, V.J. (2000), 'Model study of seepage in smear zones around vertical drains in layered soil', Geotechnique, Vol.50, No.1, pp.89-97   DOI   ScienceOn
8 Bergado, D.T., Abuel-Naga, H.M., and Thet, Y. (2004), 'Hydraulic conductivity of soft Bangkok clay under elevated temperature', Proceeding of the International Symposium on Lowland Technology, Bangkok, Thailand, pp.39-42
9 Bergado, D.T., Askami, H., Alfaro, M.C. and Balasubramaniam, A.S. (1991), 'Smear effect of vertical drains on soft Bangkok clay', Journal of Geotecchnical and Geoenvironment Engineering, ASCE, Vol.117, No. 10, pp.1509-1529   DOI