Experimental Investigation of Critical Hydraulic Gradients for Unstable Soils

Ahlinhan, Marx Ferdinand; Achmus, Martin

doi:10.1061/41147(392)58

Cited by 35 publications

(26 citation statements)

References 9 publications

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“…The experimental data were obtained from Ahlinhan et al [22]. In the examined experiment, five different non-cohesive soils were tested in specially developed test devices, under horizontal Another set of experimental data was obtained from Liang et al [35].…”

Section: Experimental Validationmentioning

confidence: 99%

“…ρ' D i = ρ D+ed (13) Many studies examined the critical gradient under an upward seepage. The results of three experiments were collected to be compared with the predicted results [9,22,36,37] (Figure 7). Overall, the predicted results and the measured data matched very well (R 2 = 0.91), though there was some discrepancies between them.…”

Section: Experimental Validationmentioning

confidence: 99%

Section: Qualitative Analysismentioning

confidence: 99%

“…The distribution of critical hydraulic gradients was calculated through Equation (8). The soil E2 [22] was taken as an example. The specimen in exam can be defined as grit sand, and the hydraulic conductivity can be calculated according to Alyamani and Zekâi [32] On the basis of previous studies [33], the ratio dc,15/df,85 was used to determine the stability of the soils, with dc,15 = grain diameter with 15% w/w of the grains of the coarse soil being finer, and df,85 = grain diameter with 85% w/w of the grains of the fine soil being finer.…”

Section: Qualitative Analysismentioning

confidence: 99%

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A Theoretical Model to Predict the Critical Hydraulic Gradient for Soil Particle Movement under Two-Dimensional Seepage Flow

Huang

Bai

et al. 2017

Water

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Abstract:The soil particle movement under seepage flow is one of the predominant mechanisms responsible for incidents and failures of dams and streambanks. However, little attention has been paid to the critical hydraulic gradient under two-dimensional (2-D) seepage flow. In this study, a theoretical model was established under 2-D seepage flow to predict the critical hydraulic gradients for soil particle movement. In this model, the sediment particle rolling theory was used, while taking into account the relative exposure degree of the soil grains and the seepage direction. The model was validated through qualitative analysis and comparison with previous data, and showed considerable superiority over Terzaghi's model. In addition, the effect of the soil internal instability, implying that the critical hydraulic gradient of unstable soil is lower than that of stable soil, was discussed. Various parameters of the model were also analyzed. The results showed that the seepage direction angle was positively related to the critical gradient, whereas the void and the mean diameter of the soil were negatively related to it. Finally, the model proposes a calculation method for the particle movement initiation probability, which is regarded as a key parameter in the sediment transport model.

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Section: Experimental Validationmentioning

confidence: 99%

Section: Experimental Validationmentioning

confidence: 99%

Section: Qualitative Analysismentioning

confidence: 99%

Section: Qualitative Analysismentioning

confidence: 99%

See 2 more Smart Citations

A Theoretical Model to Predict the Critical Hydraulic Gradient for Soil Particle Movement under Two-Dimensional Seepage Flow

Huang

Bai

et al. 2017

Water

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“…Only the geometric criteria have been dealt in this paper, for the hydraulic criteria reference is made to Ahlinhan (2011) [3] and Ahlinhan et al (2010) [4].…”

Section: Introductionmentioning

confidence: 99%

Assessment of the Internal Instability for Granular Soils Subjected to Seepage

Ahlinhan¹,

Koube²,

Adjovi³

2016

GEP

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The knowledge of the internal stability of granular soils is a key factor for the design of granular and filter for the geotechnical infrastructures such as dykes, barrages, weirs and roads embankment. To evaluate the internal instability of granular soils different criteria are generally used in the practice. However, the results of these criteria on the same soil may lead to different evaluations of the internal instability. In this paper the common criteria used for the internal instability have been presented and compared as far as possible. It was found that the most internal instability criteria define a limit value for the secant slope of the grain size distribution curve of the granular soils. Based on this finding an own criterion for the evaluation of the internal instability of granular soil has been developed and compared to the common criteria. A very good agreement between some criteria was found. Furthermore, a site specific assessment for the evaluation of the internal instability of granular soil has been proposed in order to get more confidence in this evaluation.

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