Modelling shear strength of compacted soils

Bulolo, Sam; Leong, Eng Choon

doi:10.1051/e3sconf/20199215007

Cited by 3 publications

(2 citation statements)

References 27 publications

(23 reference statements)

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“…Unsaturated shear box tests were also undertaken at quick shear rates of 1 mm/min, in accordance with guidance provided in [8], to minimize changes in moisture content during shearing of the sample, at various degrees of saturation.…”

Section: Soil Testingmentioning

confidence: 99%

Unsaturated modelling, testing and monitoring towards the rehabilitation of a slope on National Route 3, KwaZulu-Natal, South Africa

Schulz-Poblete¹,

Merwe²,

Pequenino³

2023

E3S Web of Conf.

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The stability of over-steep road embankments often worsens with time. In many cases the slope deterioration can be ascribed to continual downslope creep of a surficial layer of soil that has been affected by infiltration of rainfall. Such infiltration reduces the suction in the surficial layer interacting with the environment. With every season the surficial layer moves further downslope, often resulting in cracks in theslow lane and placing structures constructed at the crest of fill slopes in potential jeopardy. A slope on the National Route 3 (N3), in the South African Province of KwaZulu-Natal, constructed at roughly 40° from the horizontal showed signs of distress in the slow lane many years after construction. The rehabilitation of this slope required stabilisation design using unsaturated soil testing, modelling, and in-situ suction measurement. The slope was stabilised using soil nails, a high-tensile steel mesh, and a suction measurement system was installed. An overview of the emergency works design, subsequent investigation, and monitoring is provided in this paper. It was found that the suction profile determined by transient finiteelement analysis matched well with the measured suction profile and provided a good basis for the emergency design works prior to full investigation.

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Section: Soil Testingmentioning

confidence: 99%

Unsaturated modelling, testing and monitoring towards the rehabilitation of a slope on National Route 3, KwaZulu-Natal, South Africa

Schulz-Poblete¹,

Merwe²,

Pequenino³

2023

E3S Web of Conf.

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“…The study of unsaturated soils has a long but somewhat uneven history (Gens et al, 2006) [3]. Unsaturated soils tended to be lumped together with other materials in soil categories variously described as ""difficult soils"", ""regional soils"", ""special soils"" or other similar names (Sam Bulolo and Eng Choon Leong, 2019) [14].…”

Section: Introductionmentioning

confidence: 99%

Compressibility Behaviour of Compacted Soils - Hyperbolic Modelling

Ratnam¹,

Prasad²

2020

International Journal of Civil Engineering and Technology (Ijciet)

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Compacted soils constitute most engineering projects such as earth dams, embankments, pavements, and engineered slopes because of their high shear strength and low compressibility. The compressibility behavior of compacted soils is a key soil parameter in the design of earth structures but it is not determined correctly owing to partly saturated state. The compressibility of compacted soils can be better evaluated under the framework of hyperbolic behavior. One dimensional Consolidation tests on compacted specimens were conducted using conventional oedometer apparatus under constant water content condition. Tests were conducted by compact the soil specimens at respective optimum moisture contents for eight different soil samples, of varying grain size characteristics and consistency limits, collected from Tirupati Region. The main objective of this study is to examine the compressibility behavior of compacted soils to propose a phenomenological model. It is observed that the compressibility behavior can be captured by hyperbolic modeling with model parameters involved in the behavior being initial void ratio, e 0, representing the initial state of soil and other hyperbolic constants linked to this state. The data of 6 samples were used for developing the model and the data of remaining two samples were used for predicting the observed response from the model proposed. The data of published literature has also been used to predict the experimental behavior to bring out the merits of the model proposed.

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Effect of moisture change on water retention behavior of unsaturated silty soil under loading- unloading conditions

Shah,

Malik,

Haq

et al. 2024

Preprint

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Earthen embankments either natural or constructed artificially often comprise of unsaturated soils being considered stronger in terms of compressibility and permeability. However, the internal nomenclature of unsaturated soils due to the presence of air, water and soil particles makes it more complex while such soils interact with moisture under the circumstances of applied stress history during the earthen structure’s life span. To investigate this behavior this study is designed to understand the soil water interaction and quantify the retention behavior during loading and unloading conditions. To serve this idea custom designed static compaction tests were carried out under un-drained water and drained air condition at applied stress history. The results show sufficient impact on the soil water retention behavior with the application of loading unloading with varying soil water contents. During the initial stages of the loading process, suction increases with decreasing void ratio due to the heterogeneous distribution of water in the soil at the initial stage. Whereas there is a unique increasing trend in suction at the reloading or wetting phase of the water retention curve at all moisture contents. To examine the impact on void ratio the experimental data has been compared with the selected model incorporating suction, void ratio and degree of saturation for prediction of soil water retention behaviors. The model prediction deviates from the experimental data and shifts away from the model prediction indicating that loading-unloading sequence coupled with the variation in moisture does affect the soil behavior.

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Modelling shear strength of compacted soils

Cited by 3 publications

References 27 publications

Unsaturated modelling, testing and monitoring towards the rehabilitation of a slope on National Route 3, KwaZulu-Natal, South Africa

Unsaturated modelling, testing and monitoring towards the rehabilitation of a slope on National Route 3, KwaZulu-Natal, South Africa

Compressibility Behaviour of Compacted Soils - Hyperbolic Modelling

Effect of moisture change on water retention behavior of unsaturated silty soil under loading- unloading conditions

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