Unsaturated Soil Mechanics in Engineering Practice

Fredlund, D. G.; Rahardjo, Harianto; Fredlund, M. D.

doi:10.1002/9781118280492

Cited by 750 publications

(591 citation statements)

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“…The dew point method was conducted by using the Decagon devices WP4 and WP4C. According to [6] osmotic suction can be neglected for the present soils. For this reason it is assumed to measure only matric suction with both methods.…”

Section: Testing Methods and Sample Preparationmentioning

confidence: 99%

“…It is common practice to determine the boundary drying curve experimentally while usually less effort is made to measure the boundary wetting curve [6]. The hysteretic behaviour is then often predicted with empirical or physically based models [7,8,9,10,11].…”

Section: Introductionmentioning

confidence: 99%

“…Furthermore, to study the influence of the water content during compaction, the hysteresis of one silty sand is experimentally determined for two compaction water contents. The measurements are carried out using tensiometers at low suctions and the dew point method at high suctions, as described in [6,12].…”

Section: Introductionmentioning

confidence: 99%

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Experimental determination of the hysteretic behaviour of soil-water retention curve of silty sands

Angerer

Birle

2016

E3S Web Conf.

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Abstract. Shear behaviour of unsaturated silty sands is closely linked to the soil-water retention curve (SWRC). The SWRC depends beside the pore structure mainly on the hydraulic path. It hence shows hysteretic behaviour for wetting and drying cycles. This paper presents the results of the experimental determination of the boundary drying and wetting curve for two silty sands. The measurements were carried out using tensiometers at low suctions and the dew point method at high suctions. The influence of water content during compaction was studied by measuring the boundary drying and wetting curves for one silty sand compacted at two different water contents. The experimental results were compared to the predictions of 3 empirical models. The study showed that all models compare well to the experimental results for water contents above the residual water content. A modification was suggested to improve the performance at low water contents.

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Section: Testing Methods and Sample Preparationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Experimental determination of the hysteretic behaviour of soil-water retention curve of silty sands

Angerer

Birle

2016

E3S Web Conf.

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“…From a geotechnical perspective, the main reason for slope failure is the loss of matric suction and hence a loss of effective stress as water infiltrates the soil. Many researchers [2,4,5] have studied rainfall-induced landslides through laboratory and field tests, as well as through numerical analysis. They have presented a mechanism for rainfall-induced landslides that commonly occur when the wetting bands progress into the soil, resulting in a loss of suction and a reduction in effective stress [6,7].…”

Section: Introductionmentioning

confidence: 99%

Analysis of Rainfall-Induced Landslide on Unsaturated Soil Slopes

et al. 2017

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This paper investigates rainfall-induced landslides on partially saturated soil slopes using the 2011 Umyeonsan landslides at the center of Seoul, Korea. An integrated analysis of rainfall-induced landslide was carried out through laboratory tests, field tests, and numerical analysis. The results of comprehensive investigations in the Umyeonsan region demonstrate that landslide activity is closely related primarily to rainfall and soil properties and slope geometry, and vegetation. Numerical analysis was also performed to confirm the effect of these factors on landslide occurrence. Special attention was given to rainfall penetration analysis to determine the wetting band depth for shallow and deep-seated slope failure in watershed-scale landslide. The simulated results agree closely with the investigation results, which indicates that the applied method is appropriate for use in the simulation of landslides in unsaturated soils.

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“…It is a useful tool for indicating the hydraulic properties of the soil and has various applications in the field of unsaturated soil mechanics, such as strength theory, percolation theory, consolidation theory, and constitutive theory [1][2][3][4][5]. The SWCC is also commonly employed in estimating the shear strength, stress-strain relationships, and permeability of unsaturated soils [6][7][8].…”

Section: Introductionmentioning

confidence: 99%

A Simple Fractal-Based Model for Soil-Water Characteristic Curves Incorporating Effects of Initial Void Ratios

et al. 2018

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Abstract:In this paper, a simple and efficient fractal-based approach is presented for capturing the effects of initial void ratio on the soil-water characteristic curve (SWCC) in a deformable unsaturated soil. In terms of testing results, the SWCCs (expressed by gravimetric water content) of the unsaturated soils at different initial void ratios were found to be mainly controlled by the air-entry value (ψ a ), while the fractal dimension (D) could be assumed to be constant. As a result, in contrast to the complexity of existing models, a simple and efficient model with only two parameters (i.e., D and ψ a ) was established for predicting the SWCC considering the effects of initial void ratio. The procedure for determining the model parameters with clear physical meaning were then elaborated. The applicability and accuracy of the proposed model were well demonstrated by comparing its predictions with four sets of independent experimental data from the tests conducted in current work, as well as the literature on a wide range of soils, including Wuhan Clay, Hefei and Guangxi expansive soil, Saskatchewan silt, and loess. Good agreements were obtained between the experimental data and the model predictions in all of the cases considered.

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Unsaturated Soil Mechanics in Engineering Practice

Cited by 750 publications

References 0 publications

Experimental determination of the hysteretic behaviour of soil-water retention curve of silty sands

Experimental determination of the hysteretic behaviour of soil-water retention curve of silty sands

Analysis of Rainfall-Induced Landslide on Unsaturated Soil Slopes

A Simple Fractal-Based Model for Soil-Water Characteristic Curves Incorporating Effects of Initial Void Ratios

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