Estimation of Shear Strength of Gravelly and Sandy Soils From Shallow Landslides

Ravindran, Sinnappoo; Gratchev, Ivan

doi:10.21660/2020.70.13802

Cited by 5 publications

(7 citation statements)

References 16 publications

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“…Soil samples were collected from several landslide sites to study the index properties and strength of soil material. As reported by Ravindran and Gratchev (2020), most of soil samples were classified as coarse-grained material, predominantly sand. Only small amount of fines (usually less than 5%) were present in the tested soil samples.…”

Section: Characteristics Of Soils From Landslide Sitesmentioning

confidence: 74%

Mechanisms of Shallow Rainfall-Induced Landslides from Australia: Insights into Field and Laboratory Investigations

Gratchev

Ravindran

Kim³

et al. 2023

Progress in Landslide Research and Technology, Volume 1 Issue 1, 2022

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This paper presents and discusses the mechanisms of rainfall-induced shallow landslides that commonly occur in South East Queensland (SEQ) and northern New South Wales (NSW), Australia. The major factors causing the formation of landslide mass such as geology, weathering, and rainfall patterns were discussed. Results from field surveys and laboratory testing of rock/soil material from landslide masses were presented, and relationships between the material strength and landslide occurrence were drawn. It was found that most of shallow slides were related to sandstone deposits. Those failures occurred on natural slopes and road cuts with the inclination of the failure plane being in the range of 35–45°. For natural slopes where the landslide mass mostly consisted of coarse-grained soil, the relationship between the soil strength and water content was established. In addition, the relationship between rainfall patterns such as intensity and duration, and the landslide occurrence was presented. Based on the data from field work and laboratory results including a series of flume tests, the mechanism of shallow landslides triggered by rainfall events was identified and discussed.

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Section: Characteristics Of Soils From Landslide Sitesmentioning

confidence: 74%

Mechanisms of Shallow Rainfall-Induced Landslides from Australia: Insights into Field and Laboratory Investigations

Gratchev

Ravindran

Kim³

et al. 2023

Progress in Landslide Research and Technology, Volume 1 Issue 1, 2022

View full text Add to dashboard Cite

show abstract

“…The standard proctor tests determined the maximum dry density and the optimum moisture content of the test materials. The test results show that the maximum dry density decreases from 1.59 to 1.44 g/cm 3 with a corresponding increase in optimum moisture content from 10.5 to 21.8 %, as the mean grain size decrease for silica no. 3 to 7 (Fig.…”

Section: Fig 1 Grain Size Distribution Curves Of the Test Materialsmentioning

confidence: 97%

“…This negative pore water pressure is known as suction (𝑢𝑎−𝑢𝑤) and which is defined as the difference between pore air and pore water pressure. A change in the moisture content of the soil results in a change in the soil suction, which directly influences the soil shear strength [1][2][3].…”

Section: Introductionmentioning

confidence: 99%

Effect of the optimum and residual moisture content on the strength characteristics of unsaturated sands

2023

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Soil exists mainly in unsaturated conditions. Therefore, accurate prediction of the soil shear strength for unsaturated conditions also becomes equally important for the geotechnical design of earth structures. This study primarily investigates the effect of the moisture content of unsaturated soil on its shear strength. The strength characteristics of silica sands with different grain sizes were studied using the modified triaxial apparatus and analytical methods. For this purpose, four series of triaxial compression tests on silica sands were performed by varying the moisture content of the test sample at compaction and shearing as optimum or residual moisture content. The test results showed that the test sample sheared at optimum and residual moisture content exhibited higher shear strength when the sample was initially compacted at residual and optimum moisture content, respectively. The moisture content at compaction and the soil grain size considerably influence the shear strength of unsaturated sandy soils. Furthermore, the analytical method used in this study for unsaturated soil shear strength prediction does not account for the effect of initial moisture content in predicting unsaturated soil shear strength.

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“…Various approaches adopted in the past to determine the shear strength of unsaturated soils, as discussed in the literature review section, include the effective stress approach [10] either using parameter 𝜒𝜒 [11] or the suction stress concept [5] and the independent stress variable approach [12] using 𝜑𝜑 𝑏𝑏 .…”

Section: Soil Shear Strength Comparison For Experimental and Analytic...mentioning

confidence: 99%

“…Parameter 𝜒𝜒 is related to the degree of saturation, and suction stress 𝜎𝜎 𝑠𝑠 defined by [5] also depends upon the degree of saturation. Vanapalli [9] gave Eq.…”

Section: Soil Shear Strength Comparison For Experimental and Analytic...mentioning

confidence: 99%

Comparison of the Shear Strength of Unsaturated Sandy Soils at Optimal and Residual Moisture Contents

Ahmad¹

2023

GEOMATE

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The shear strength of soil is a key input parameter required for the satisfactory geotechnical design of any structure. The existence of most residual soils in unsaturated conditions highlights the importance of studying the shear strength of unsaturated soils. In this study, a modified triaxial apparatus was used to examine the mechanical behavior of 5 types of silica sands with mean grain sizes varying from 0.15 to 1.5 mm. The experimental test results of soil shear strength determination were compared with the shear strength estimated through analytical methods. To study the mechanical behavior of test soils at optimal and residual moisture contents, the test samples were initially prepared at the optimal moisture content. To study the effect of the initial moisture content on the mechanical behavior of test soils at the residual moisture content, the test samples were initially prepared at the optimal and residual moisture contents. Residual moisture content samples exhibited higher shear strength compared to optimal moisture content samples. Furthermore, the residual moisture content samples prepared at the optimal moisture content exhibited stronger mechanical behavior compared to the sample prepared at the residual moisture content. The analytical methods employed in this study were not able to accurately predict the shear strength of test soils at residual moisture content.

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Estimation of Shear Strength of Gravelly and Sandy Soils From Shallow Landslides

Cited by 5 publications

References 16 publications

Mechanisms of Shallow Rainfall-Induced Landslides from Australia: Insights into Field and Laboratory Investigations

Mechanisms of Shallow Rainfall-Induced Landslides from Australia: Insights into Field and Laboratory Investigations

Effect of the optimum and residual moisture content on the strength characteristics of unsaturated sands

Comparison of the Shear Strength of Unsaturated Sandy Soils at Optimal and Residual Moisture Contents

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