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• W52342021 abstract "Discharge capacity tests are carried out to investigate the factors influencing the discharge capacity of prefabricated horizontal drains (PHD) for improving soft dredged clays. Six representative PHD are selected, based on drain size as well as core shape. The tests were carried out for 10 days at each of the 3 levels of confining pressure for all the drains. Examined were the effects of elapsed time, confining pressure, hydraulic gradient and strength of filter and core on discharge capacities. It is found that the discharge capacity of the drain with a deformable core or the possibility of squeezing the filter into the core decreases with elapsed time. As the confining pressure increases, the discharge capacity decreases due to the filter being squeezed into the core. To verify the compatibility of the selected drains in the field, the test results are compared with the required discharge capacities proposed for assumed field conditions. The drain with a flexible filament-shaped core does not satisfy the required discharge capacity at given hydraulic gradients. The other drains, with cores of an embossed, latticed, harmonica, and circular shape, satisfy the proposed criteria. INTRODUCTION Because of high water content, the bearing capacity of dredged clays is close to zero, and some countermeasures are needed to improve the clays. A good alternative may be a horizontal drain method that installs plastic drains in the reclaimed ground in the horizontal direction and applies either vacuum pressure or gravity drainage at the end of the drains. Drains installed in the ground are subjected to confining pressure, which causes the reduction of discharge capacity as well as of the drain’s flow area. To make the horizontal drain method efficient in the field, it is necessary to find out the variations in drains’ discharge capacity through various factors of the drain materials and the ground. The characteristics of discharge capacity, especially for prefabricated vertical drains, have been studied by many researchers (Kremer et al., 1982; Holtz et al., 1991; Bergado et al., 1996; and Miura, 1998). In this study, discharge capacity tests were conducted to investigate the factors influencing the discharge capacity of horizontal drains. Six representative prefabricated horizontal drains (PHD) were selected, based on the size of the drains as well as the shape of the core. The tests were carried out for 10 days at each level of confining pressure—10, 50 and 100 kPa—for all the drains in order to measure the discharge capacity; additionally, strength tests were conducted. The effects of elapsed time, confining pressure, hydraulic gradient and strength of core and filter on the discharge capacities were examined. Required discharge capacities for design were proposed for the assumed field conditions and compared with the results of the discharge capacity test to verify the compatibility of the drains tested. ∗ISOPE Member. Received July 23, 2002; revised manuscript received by the editors February 19, 2003. The original version was submitted directly to the Journal." @default.
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• W52342021 title "A Study On Characteristics of Discharge Capacity For Horizontal Drains" @default.
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