Effect of trees on suction in soil slopes
Most residual slopes have deep groundwater table, where the soil above the ground water table is unsaturated. However, the high-intensity and long duration rainfall can cause the soil to become fully saturated and slope failure may occur. Matric suction plays an important role in the shear streng...
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| Format: | Final Year Project |
| Language: | English |
| Published: |
2018
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| Subjects: | |
| Online Access: | http://hdl.handle.net/10356/76318 |
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| Institution: | Nanyang Technological University |
| Language: | English |
| Summary: | Most residual slopes have deep groundwater table, where the soil above the ground water table is
unsaturated. However, the high-intensity and long duration rainfall can cause the soil to become
fully saturated and slope failure may occur. Matric suction plays an important role in the shear
strength of the unsaturated soil as the negative pore water pressure contributes additional shear
strength to the soil. This study carried out a field monitoring programme on a residual soil slope
where two rain trees are on the crest of the slope. Suction was measured at four different rows,
five different locations and three different depths using Quick Draw tensiometers. The results
during the dry period show the point at 20 cm depth nearest to the tree experienced the highest
suction and the suction decreases as depth increases or the distance from the increases. During the
rain period, the effect of tree on suction decreases significantly at crest of the slope and the effect
of the tree was not seen at row 3 and row 4. |
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