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http://dx.doi.org/10.14481/jkges.2011.12.10.5

An Analysis of the Effect of PBD Discharge Capacity to Leave Period  

Lee, Keeyong (서울시립대학교 토목공학과)
Park, Minchul (서울시립대학교 토목공학과)
Jeong, Sangguk (송원대학교 공간환경시스템공학과)
Lee, Song (서울시립대학교 토목공학과)
Publication Information
Journal of the Korean GEO-environmental Society / v.12, no.10, 2011 , pp. 39-49 More about this Journal
Abstract
Recently PBD method, one of acceleration of consolidation methods is used in the soft ground to shorten consolidation time for fast settlement during construction. It is economical and easy to work. Discharge capacity of PBD is sensitive in proportion to thickness of soft ground layer, and drainage of PBD declines due to disturbance effect in surrounding ground by mandrel used for vertical drainage setting and setting machines and type. Also, deviation of discharge capacity is large according to ground condition, construction condition and soil properties. In addition, when embankment loading is not conducted instantly after PBD setting due to rain or lack of embankment material supply, it causes leaving period problems. But cause and analysis of those problems for discharge capacity is lack. So, in this test, ground improvement and discharge capacity is investigated by implementing composite discharge capacity test for analysis of an effect factor of PBD discharge capacity with leaving period. After fixing the vertical drain on a cylindrical cylinder, put churned sample into the cylinder. Then leave 0day, 30day, 60day and 90day. And then, load following the loading step of 30, 70 and 120kPa using a pressure device. As a result, the longer leaving period, discharge capacity is reduced. It is caused by a decrease of discharge area caused by creep transformation moisture absorption of PBD filter after long leaving period.
Keywords
Acceleration of consolidation method; Composite discharge capacity test; PBD;
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