Experimental investigation – influence of the shape of the gradation curve on the soil structure

Jentsch, H.; Sadaghiani, M; Winkler, Paul M.; Witt, Karl Josef

doi:10.1201/b17703-13

Cited by 4 publications

(3 citation statements)

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“…In the literature, there is also a process named Suffosion which is defined as a process similar to backward erosion that occurs in a widely gap graded soil without the skeleton, i.e. the soil has a dominant fine matrix (see Jentsch et al 2014). Authors consider this process as the backward erosion process.…”

Section: Overviewmentioning

confidence: 99%

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Experimental investigations of critical hydraulic gradients for a soil prone to suffusion

Sadaghiani¹,

Witt²,

Odenwald³

2016

Scour and Erosion

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The presence of soils, which are at the limit state of internal stability, is a potential risk to earthworks under seepage flow. Therefore, it is necessary to identify unstable soils and to estimate hydraulic gradients at which the suffusion can be initiated respectively progressed. An experimental study has been carried out to quantify critical hydraulic gradients for a widely graded soil. For the tested soil, in downwards vertical percolation experiments, the global critical hydraulic gradients lie in the different ranges between i crit = 0.1 to 5.5 with dependency on the particle arrangement. The critical hydraulic gradient was investigated using various types of sample preparation technique. Moreover, suffusion tests using several types of samples with the same particle size distribution have been carried out. It states that for such a widely graded soil, the main problem is the particle arrangement. In other words, the suffusion might be not problematic if there is no segregation. Sometimes a specific amount of segregation also stabilizes the sample against suffusion. The common way of sample preparation delivers comparable results to the results of other researchers.

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Section: Overviewmentioning

confidence: 99%

“…6. Suffusion: the process in widely and gap-graded soils with a dominant coarse matrix (soils with a higher percentage of coarse grains which build the soil skeleton and fines embedded within the pore spaces of the soil skeleton), whereby finer particles suffuse through the pores between coarser skeletal grains (see also Jentsch et al 2014).…”

mentioning

confidence: 99%

Experimental investigations of critical hydraulic gradients for a soil prone to suffusion

Sadaghiani¹,

Witt²,

Odenwald³

2016

Scour and Erosion

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“…Burenkova [7] considered that a fraction of fine particles does not belong to the granular skeleton and does not affect the volume of the soil if it is removed. This concept was developed into the sequential filling test and has been widely used to determine the separation point between the skeleton and fill fractions through experimental or numerical methods [17,18,30,32,45].…”

Section: Introductionmentioning

confidence: 99%

Size distribution of free particles in soils: a geometric modelling approach

Zhang

Luo

et al. 2021

Acta Geotech.

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Suffusion is a typical form of internal erosion for gravel soils in which fine particles are detached by seepage and transport by water through pores. The prediction of erodible particles can improve the assessment of the development of suffusion. The current research on the composition of erodible particles is not sufficiently detailed. The content of erodible particles cannot be accurately determined for a particular gradation. In this paper, a geometric method of generating a particle packing model is proposed. The particles are classified as free or skeleton particles depending on their coordination numbers; thus, their particle size distributions are obtained. Soils with different gradations were analysed using the proposed method. The results indicated that if the grading curve of a soil can be expressed using a fractal relationship, the gradation of free particles also satisfies an exponential function. This is useful in promoting the research on establishing accurate internal erosion criteria, evaluating the performance of filter layers, and predicting the degree of seepage failure caused by internal erosion.

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Discussion of “Geometrical Method for Evaluating the Internal Instability of Granular Filters Based on Constriction Size Distribution” by Buddhima Indraratna, Jahanzaib Israr, and Cholachat Rujikiatkamjorn

Dallo

Wang

2016

J. Geotech. Geoenviron. Eng.

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Experimental investigation – influence of the shape of the gradation curve on the soil structure

Cited by 4 publications

References 1 publication

Experimental investigations of critical hydraulic gradients for a soil prone to suffusion

Experimental investigations of critical hydraulic gradients for a soil prone to suffusion

Size distribution of free particles in soils: a geometric modelling approach

Discussion of “Geometrical Method for Evaluating the Internal Instability of Granular Filters Based on Constriction Size Distribution” by Buddhima Indraratna, Jahanzaib Israr, and Cholachat Rujikiatkamjorn

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