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Laboratory tests to study stability mechanism of rainfall infiltrated unsaturated fine-grained soil slopes developing into shallow landslides and their hydraulic properties

Author: Yavuz Şahin
Publisher: [Place of publication not identified] : [publisher not identified], 2013.
Dissertation: Master İzmir Institute of Technology, İzmir 2013
Edition/Format:   Thesis/dissertation : Thesis/dissertation : Manuscript   Archival Material : English
Summary:
This study consists of two parts. In the first part, saturated soils wetting band infiltration theories and the most widely used in the world by Lumb, 1975 and Pradel and Raad, 1993 compares theoretical predictions were compared with observed results which gave poor correlations. Results showed that both theories grossly underestimated wetting-band thicknesses. Because above mentioned two theories result in constant  Read more...
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Details

Material Type: Thesis/dissertation, Manuscript
Document Type: Book, Archival Material
All Authors / Contributors: Yavuz Şahin
OCLC Number: 879213826
Language Note: Text in English; Abstract: Turkish and English.
Description: xiv, 123 leaves : illustrations + 1 computer optical disc
Responsibility: Yavuz Şahin ; thesis advisor İsfendiyar Egeli.

Abstract:

This study consists of two parts. In the first part, saturated soils wetting band infiltration theories and the most widely used in the world by Lumb, 1975 and Pradel and Raad, 1993 compares theoretical predictions were compared with observed results which gave poor correlations. Results showed that both theories grossly underestimated wetting-band thicknesses. Because above mentioned two theories result in constant values, instead of giving values changing as functions of time. These theories need corrections, which indicate need for further studies. In the second part, hydraulic properties were determined (water-retention, hydraulic-conductivity) of locally obtained 3 undisturbed soils near saturation with a new Hyprop testing technique using the evaporation method. As the Unified Soil Classification System (USCS) does not distinguish inorganic clay colloids by size (size <0,001 mm or 1000 nanometers), Lazer Diffraction Method was used. Results have shown that under zero overall stress; Matric suction does not stay constant, but increases with time up to a maximum point and then decreases, whereas time to reach maximum matric suction increases with decreasing plasticity index (PI) and colloid content (c). While maximum matric suction increases with PI and c, hydraulic conductivity and volumetric water content decreases with increasing matric suction. Also, hydraulic conductivity at maximum matric suction decreases with increasing PI and c.

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