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Advanced Soil Mechanics

Seepage-induced internal erosion in earth-filled embankment dams has been attracting the attention of civil engineering researchers and practitioners for decades. Microbially induced carbonate prec...

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The applicability of microbially induced calcite precipitation (MICP) for internal erosion control in gravel–sand mixtures

This paper gives the results of, an investigation of more than two hundred masonry dams with various kinds of earth foundation, to determine the length of the percolation path necessary to prevent ...

Closure of "Security from Under-Seepage-Masonry Dams on Earth Foundations"

Suffusion is a selective erosion of fine particles under the effect of seepage flow within the matrix of coarser particles. This complex phenomenon appears as a combination of three process...

Effects of Hydraulic Loading History on Suffusion Susceptibility of Cohesionless Soils

Molten salt-assisted synthesis of Ce4O7/Bi4MoO9 heterojunction photocatalysts for Photo-Fenton degradation of tetracycline: Enhanced mechanism, degradation pathway and products toxicity assessment

Internal instability occurs when the finer fraction from a well-graded granular soil escapes with the infiltrates, rendering a filter ineffective Thus far, numerous particle size as well as constriction size distribution–based geometrical methods have been proposed to assess potential internal instability This paper reports the results from hydraulic tests performed on six granular soils (five well-graded sand-gravel mixtures and medium sand) at different uniformity coefficients and compacted at varying relative density The study facilitated an objective evaluation of some of the well known published methods, leading to a more realistic interpretation of filtration data based on a revised technique, which accurately demarcates the boundary between internally stable and unstable granular soils A large body of published data and the current laboratory results were used to validate the proposed criterion for the assessment of internal instability, which is also sensitive to the relative density o

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Geometrical Method for Evaluating the Internal Instability of Granular Filters Based on Constriction Size Distribution

This paper reports on a series of laboratory hydraulic tests on a select range of granular soils compacted at relative densities between 0% and 100%. The critical hydraulic gradient at the ...

Study of Critical Hydraulic Gradients for Seepage-Induced Failures in Granular Soils

Enhanced photocatalytic characteristics and low selectivity of a novel Z-scheme TiO2/g-C3N4/Bi2WO6 heterojunction under visible light

Results from a series of hydraulic tests conducted on four compacted granular filters in a one-dimensional rigid cell under static and cyclic loading conditions are presented. It is reveale...

Internal Stability of Granular Filters under Static and Cyclic Loading

Experimental observations of the seepage induced response of soils under static and cyclic loading are reported. Hydraulic tests were performed using a modified filtration apparatus designed to capture the response of soils subjected to an upward flow. This apparatus could conveniently monitor various factors influencing the onset of seepage induced failures such as spatio-temporal variations in porosity, average and local hydraulic gradients, and the mean effective stress distribution with depth. Under static conditions, heave and heave-piping failures occurred in densely compacted uniform fine-gravels and fine-sands, respectively, and excessive washout (i.e., suffusion) was observed in gap-graded sandy-gravel soil. Despite this gap-graded soil failing in a similar way under static loading, relatively premature suffusion occurred under cyclic loading that could be attributed to the constant agitation of fines and the development of pore pressure within the pore spaces. The reported results and published data under cyclic loading were compared with various static filtration criteria to assess their potential instability, and they revealed that none could accurately capture their cyclic filtration response. However, at the onset of instability, a unique hydro-mechanical correlation could be observed between the magnitudes of local hydraulic gradients and effective stresses calculated using a proposed stress reduction model. Nevertheless, this correlation governing the inception of instability in reported tests established a clear hydro-mechanical boundary with possible implications for practical filter design under cyclic loading conditions.

Jahanzaib Israr

Papers

Geometrical Method for Evaluating the Internal Instability of Granular Filters Based on Constriction Size Distribution

Study of Critical Hydraulic Gradients for Seepage-Induced Failures in Granular Soils

Enhanced photocatalytic characteristics and low selectivity of a novel Z-scheme TiO2/g-C3N4/Bi2WO6 heterojunction under visible light

Internal Stability of Granular Filters under Static and Cyclic Loading

Laboratory Investigation of the Seepage Induced Response of Granular Soils Under Static and Cyclic Loading