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Estimation on Discharge Capacity of Prefabricated Vortical Drains Considering Influence Factors  

Shin Eun-Chul (Dept. of Civil and Envir. System Engrg., University of Incheon)
Park Jeong-Jun (Dept. of Civil and Envir. System Engrg., University of Incheon)
Kim Jong-In (Dept. of Civil and Envir. System Engrg., University of Incheon)
Publication Information
Journal of the Korean Geotechnical Society / v.21, no.9, 2005 , pp. 13-23 More about this Journal
Abstract
The prefabricated vertical drains (PVDs) are one of the most widely used techniques to accelerate the consolidation of soft clay deposits and dredged soil. Discharge capacity is one of the factors affecting the behavior of PVDs. In the field, a PVD is confined by clay or dredged soil, which is normally remolded during PVD installation. Under field conditions, soil particles may enter the PVD drainage channels, and the consolidation settlement of the improved subsoil may cause 131ding of the PVD. These factors will affect the discharge capacity of the PVDs. In this study an experimental study was carried out to estimate the discharge capacity of three different types of PVDs by utilizing the large-scale laboratory model testing and small-scale laboratory model testing equipments. The several factors such as confinement condition (confined by soft marine clay or dredged soil) and variations of the discharge capacity were studied with time under soil specimen confinement, The test results indicated that discharge capacity decreases with increasing load, time, and hydraulic gradient. With load application, the cross-sectional area of the drainage channel of PVD decreases because the filter of PVD is pressed into the core. The discharge capacity of the soft marine clay-confined PVDs is much lower than that of the dredged soil-confined PVDs.
Keywords
Discharge capacity; Dredged soil; Hydraulic gradient; Large-scale model test; Marine clay; PVDs;
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Times Cited By KSCI : 1  (Citation Analysis)
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