Evaluation of Excess Pore Water Pressure Characteristics in Sand Mat Used for Recycling Dredged Soil |
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| Authors: | Min-Sun Lee Kazuhiro Oda |
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| Institution: | 1. Department of Civil Engineering, Graduate School of Engineering, Osaka University, Osaka, Japan;2. Hydro-soft Technology Institute, Japanminsoni@civil.eng.osaka-u.ac.jp |
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| Abstract: | The design of sand mats should be reviewed on the basis of excess pore pressure behavior, which can be obtained by combining the characteristics of soft ground with the permeability of the mats. In this study, a banking model test was performed using dredged sand as the mat material to investigate the hydraulic gradient distribution of sand mats. The results were compared with numerical analysis results utilizing Terzaghi's one-dimensional consolidation equation. The results showed that the pore pressure was influenced by an increase in the amount of settlement at the central part of the sand mat as the height of the embankment increased. The measured decrease of the pressure head due to the residing water pressure in the sand mat was delayed compared to the numerical analysis results. Accordingly, sand mats should be laid to reduce the increased hydraulic gradient at the central part of the embankment. |
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| Keywords: | dredged soil excess pore water pressure hydraulic gradient model test sand mat |
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