Abstract
Soil suction induced by grass Evapotranspiration (ET) in vegetated landfill covers is recognised to potentially reduce percolation (due to the decrease in water permeability) and also improve slope stability (due to the increase in soil shear strength) upon rainfall. However, grass-induced suction is generally ignored when analysing a vegetated cover because effects of root-water uptake on suction is less understood. In this study, a series of laboratory tests were conducted to measure suction induced during ET and suction retained during ponding. Compacted silty sand with and without vegetated with a grass species, Cynodon dactylon, were tested in an atmospheric-controlled room. Responses of suction were monitored by 12 tensiometers. By investigating water flow mechanism in vegetated soil, vertical and horizontal influence zones of suction are identified in relation to grass root characteristics. Measurements from bare and vegetated soil are compared to quantify the effects of grass on suction retention upon ponding.
| Original language | English |
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| Title of host publication | Unsaturated Soils |
| Subtitle of host publication | Research and Applications - Proceedings of the 6th International Conference on Unsaturated Soils, UNSAT 2014 |
| Pages | 1373-1379 |
| Number of pages | 7 |
| Volume | 2 |
| Publication status | Published - 2014 |
| Event | 6th International Conference on Unsaturated Soils, UNSAT 2014 - Sydney, Australia Duration: 2 Jul 2014 → 4 Jul 2014 |
Conference
| Conference | 6th International Conference on Unsaturated Soils, UNSAT 2014 |
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| Country/Territory | Australia |
| City | Sydney |
| Period | 2/07/14 → 4/07/14 |