Abstract
Transient seepage analysis in unsaturated soils requires the soil-water characteristic curves (SWCCs) and permeability functions. Very often, the soil-water characteristic of a soil at high suction range (> 500 kPa) is obtained by extrapolating laboratory-determined SWCC at low suction range (0 to 500 kPa) using semi-empirical fitting methods. Relatively few measurements of SWCCs have been made on decomposed soils at high suctions. In this study, SWCC at low suctions of a completely decomposed tuff (CDT) in Hong Kong was measured using pressure plate apparatus, whereas the SWCC at high suctions was measured using the relative humidity (RH) control technique. Hence, the SWCC of CDT at "full suction range" is obtained by combining the measured data at low and high suctions. Comparisons and evaluations are then made with the extrapolated data using several existing semi-empirical fitting methods.
| Original language | English |
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| Title of host publication | Unsaturated soils : experimental studies in unsaturated soils and expansive soils |
| Subtitle of host publication | proceedings of the 4th Asia Pacific conference in saturated soils, Newcastle, Australia, 23-25 November 2009 |
| Editors | O. Buzzi, S. Fityus, D. Sheng |
| Place of Publication | Boca Raton, Fla. |
| Publisher | CRC Press-Taylor & Francis Group |
| Pages | 199-204 |
| Number of pages | 6 |
| ISBN (Print) | 9780415877176 |
| Publication status | Published - 2009 |
| Event | 4th Asia Pacific Conference on Unsaturated Soils - Newcastle, Australia Duration: 23 Nov 2009 → 25 Nov 2009 |
Conference
| Conference | 4th Asia Pacific Conference on Unsaturated Soils |
|---|---|
| Country/Territory | Australia |
| City | Newcastle |
| Period | 23/11/09 → 25/11/09 |