Strength and structure of laterites and lateritic soils

Lohnes, R A; Demirel, T

doi:10.1016/0013-7952(73)90004-5

Cited by 31 publications

(28 citation statements)

References 4 publications

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“…With regard to the geotechnical parameters, Simon et al (1990) and Lohnes and Demirel (1973) reported values for cohesive strength and friction angle for some of the geological units, and illustrated the expected high variability of these two quantities. The uncertainty associated with these parameters is large when we consider their spatial distribution across four soil types within the domain.…”

Section: Surface Data and Parametersmentioning

confidence: 90%

Physically based modeling of rainfall-triggered landslides: a case study in the Luquillo forest, Puerto Rico

Lepore

Arnone

Noto

et al. 2013

Hydrol. Earth Syst. Sci.

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Abstract. This paper presents the development of a rainfalltriggered landslide module within an existing physically based spatially distributed ecohydrologic model. The model, tRIBS-VEGGIE (Triangulated Irregular Networks-based Real-time Integrated Basin Simulator and Vegetation Generator for Interactive Evolution), is capable of a sophisticated description of many hydrological processes; in particular, the soil moisture dynamics are resolved at a temporal and spatial resolution required to examine the triggering mechanisms of rainfall-induced landslides. The validity of the tRIBS-VEGGIE model to a tropical environment is shown with an evaluation of its performance against direct observations made within the study area of Luquillo Forest.The newly developed landslide module builds upon the previous version of the tRIBS landslide component. This new module utilizes a numerical solution to the Richards' equation (present in tRIBS-VEGGIE but not in tRIBS), which better represents the time evolution of soil moisture transport through the soil column. Moreover, the new landslide module utilizes an extended formulation of the factor of safety (FS) to correctly quantify the role of matric suction in slope stability and to account for unsaturated conditions in the evaluation of FS.The new modeling framework couples the capabilities of the detailed hydrologic model to describe soil moisture dynamics with the infinite slope model, creating a powerful tool for the assessment of rainfall-triggered landslide risk.

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Section: Surface Data and Parametersmentioning

confidence: 90%

Physically based modeling of rainfall-triggered landslides: a case study in the Luquillo forest, Puerto Rico

Lepore

Arnone

Noto

et al. 2013

Hydrol. Earth Syst. Sci.

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show abstract

“…Among those characteristics listed in the above definition, hardness is the only one which makes laterite unique. Later on, Lohnes and Demirel (37) used the same definition in their studies on tropical soils, with the slight modification that "hardness means there is sufficient induration of the soil that it cannot be readily excavated by a shovel or spade. "…”

Section: Definition and Genesis Of Laterites And Lateritic Soilsmentioning

confidence: 99%

“…The most common methods utilized in studying the structure of later itic soils have been light microscopy and recently, scanning electron microscopy (30,71,37). It is extremely difficult to define the soil structure quantitatively from the micrographs obtained from microscopic studies.…”

Section: Soil Pore Structurementioning

confidence: 99%

“…Lateritic soils usually have relatively high to very high cohesion and internal friction angle (23). This behavior is generally attributed to the cementation which is taking place among the individual soil grains by the binding action of sesquioxides (23,37,49). The strength behavior of lateritic soils was observed to be very much de pendent on the moisture content of the sample tested (7,49).…”

Section: Soil Pore Structurementioning

confidence: 99%

“…Primary ferromagnesian minerals, on the other hand, are eventually converted to diffuse goethite, followed by well-crystallized goethite, and finally hematite. The crystallization leads to the forma tion of iron and/or aluminum oxide concretions, coalescence of concretions and their cementation by iron and/or aluminum colloids, until the entire system is a continuous iron and/or aluminum oxide cemented crust (55,3,60,27,37).…”

Section: Definition and Genesis Of Laterites And Lateritic Soilsmentioning

confidence: 99%

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Engineering behavior and classification of lateritic soils in relation to soil genesis

Tuncer¹

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Modeling the hydrological and mechanical effect of roots on shallow landslides

Arnone

Caracciolo

Noto

et al. 2016

Water Resources Research

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This study proposes a new methodology for estimating the additional shear strength (or cohesion) exerted by vegetation roots on slope stability analysis within a coupled hydrological‐stability model. The mechanical root cohesion is estimated within a Fiber Bundle Model framework that allows for the evaluation of the root strength as a function of stress‐strain relationships of populations of fibers. The use of such model requires the knowledge of the root architecture. A branching topology model based on Leonardo's rule is developed, providing an estimation of the amount of roots and the distribution of diameters with depth. The proposed methodology has been implemented into an existing distributed hydrological‐stability model able to simulate the dynamics of factor of safety as a function of soil moisture dynamics. The model also accounts for the hydrological effects of vegetation, which reduces soil water content via root water uptake, thus increasing the stability. The entire methodology has been tested in a synthetic hillslope with two configurations of vegetation type, i.e., trees and shrubs, which have been compared to a configuration without vegetation. The vegetation has been characterized using roots data of two mediterranean plant species. The results demonstrate the capabilities of the topological model in accurately reproducing the observed root structure of the analyzed species. For the environmental setting modeled, the effects of root uptake might be more significant than the mechanical reinforcement; the additional resistance depends strictly on the vegetation root depth. Finally, for the simulated climatic environment, landslides are seasonal, in agreement with past observations.

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Strength and structure of laterites and lateritic soils

Cited by 31 publications

References 4 publications

Physically based modeling of rainfall-triggered landslides: a case study in the Luquillo forest, Puerto Rico

Physically based modeling of rainfall-triggered landslides: a case study in the Luquillo forest, Puerto Rico

Engineering behavior and classification of lateritic soils in relation to soil genesis

Modeling the hydrological and mechanical effect of roots on shallow landslides

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