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Stability of tropical residual soils from Dominica, West Indies
Abstract Tropical residual soil slopes frequently have very high moisture contents (over 100%) and low unit weights (5.5–10.0 kN/2). However, they can remain stable at much higher angles (over 40°) than slopes covered with transported and redeposited soil. Standard laboratory tests and stability calculations fail to predict their behaviour accurately since they often fail to represent in situ conditions. In this paper the tropical volcanic soils of Dominica, West Indies, are used to provide a critical examination of standard tests and procedures. Laboratory values of residual shear strength are shown to be inconsistent and frequently low. Explanations are offered in terms of testing pressures, the structure of the soil and the dynamics of soil water movement through the profile. Three commonly used stability models are examined. Their failure to predict field slope angles accurately is accounted for by the (unrepresentative, laboratory-derived) values input into the models and by the accumulation of averaging errors at the high slope angles used.
Stability of tropical residual soils from Dominica, West Indies
Abstract Tropical residual soil slopes frequently have very high moisture contents (over 100%) and low unit weights (5.5–10.0 kN/2). However, they can remain stable at much higher angles (over 40°) than slopes covered with transported and redeposited soil. Standard laboratory tests and stability calculations fail to predict their behaviour accurately since they often fail to represent in situ conditions. In this paper the tropical volcanic soils of Dominica, West Indies, are used to provide a critical examination of standard tests and procedures. Laboratory values of residual shear strength are shown to be inconsistent and frequently low. Explanations are offered in terms of testing pressures, the structure of the soil and the dynamics of soil water movement through the profile. Three commonly used stability models are examined. Their failure to predict field slope angles accurately is accounted for by the (unrepresentative, laboratory-derived) values input into the models and by the accumulation of averaging errors at the high slope angles used.
Stability of tropical residual soils from Dominica, West Indies
Reading, Alison J. (author)
Engineering Geology ; 31 ; 27-44
1990-11-09
18 pages
Article (Journal)
Electronic Resource
English
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