Geotechnical Properties of Soils – Fundamentals

Ameratunga, Jay; Sivakugan, Nagaratnam; Das, Braja M.

doi:10.1007/978-81-322-2629-1_2

Cited by 4 publications

(4 citation statements)

References 10 publications

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“…Moreover, the geotechnical properties are relevant in discussing the sedimentation and rearrangement processes that occurred in the past and the expected behavior in terms of stiffness and hydraulic conductivity. Suggestions from soil mechanics indicate that at least grain-size distribution and plasticity features should be investigated for samples collected in different representative zones of the area and, possibly, at different depths (Ameratunga et al, 2016). These experiences are auxiliary also for the determination of strength properties with regard to any further process involving water streams, loading, unloading, etc.…”

Section: Geotechnical Characterizationmentioning

confidence: 99%

Geophysical–geotechnical methodology for assessing the spatial distribution of glacio‐lacustrine sediments: The case history of Lake Seracchi

Vergnano

Oggeri

Godio

2023

Earth Surf Processes Landf

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Proglacial lakes are distinctive features of deglaciated landscapes and often act as sediment sinks, collecting solid material from subglacial erosion or washout of deglaciated areas. The solid transport flow, strongly linked to the glaciers and periglacial landforms, may rise due to the rapid changes driven by climate warming, causing deep transformations in the basin hydrology, and even the appearance or disappearance of lakes at a decadal timescale.The goal of this study was to present a geophysical-geotechnical approach that integrates several techniques, to quantify the sediment distribution in a proglacial lake. A geophysical survey is performed with ground-penetrating radar (GPR) installed on a boat, whereas a time-domain reflectometer (TDR) measures the electrical conductivity and permittivity of the lakebed sediments. Unperturbed samples are collected and analyzed to measure the main geotechnical properties of the sediment: grain-size distribution, plastic limit, and liquid limit. Such properties support the interpretation of the GPR data and the detection of spatial variations of the sediment facies.To validate the proposed methodology, field tests were carried out at Lake Seracchi, the largest lake of the Rutor glacier, Italian Alps. It formed around 1880 because of the recent glacier shrinkage, as chronicled by valuable historical documents. Its greyish waters carry a significant amount of suspended sediment recognized as glacial flour, which gradually accumulates on the bottom of the lake.The obtained bathymetry and sediment thickness maps of Lake Seracchi show the strength of the approach: from only a few manual samples, it is possible to extrapolate the geotechnical properties of interest, such as friction angle or hydraulic conductivity, to wider areas, surveyed by the geophysical techniques. This is achieved by investigating the spatial distribution of key geophysical properties linked to the geotechnical properties of interest.

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Section: Geotechnical Characterizationmentioning

confidence: 99%

Geophysical–geotechnical methodology for assessing the spatial distribution of glacio‐lacustrine sediments: The case history of Lake Seracchi

Vergnano

Oggeri

Godio

2023

Earth Surf Processes Landf

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“…Unlike urban centers, the typical strata of CES has very thick Holocene clay deposits [18]. Geological ages and soil types [36,37] were used to identify the main soil layers in CES, from top to bottom as follows: 1 3-2 dredger fill (DF); 2 2-3 sandy silt (SS); 3 muddy clay (MC); 4 1-1 clay; 5 1-2 silty clay (SC) (Figure 1c). The dredger fill was a gray or grayish-yellow soil layer that was artificially deposited.…”

Section: Study Areamentioning

confidence: 99%

“…The ratio of the effective flow pore area to the total pore area is defined as the effective seepage-pore-area weight. Based on this, the logarithm of the ratio of the horizontal effective seepage-pore-area weight to the vertical effective seepage-pore-area weight was defined as the "anisotropic coefficient of effective seepage-pore-area weight", as shown in Equation (5).…”

Section: Proposal Of New Parametersmentioning

confidence: 99%

“…As a typical multi-level reclamation area in Shanghai, Chongming East Shoal (CES) has implemented multiple reclamation projects since the last century. According to Shanghai land management and field investigations, newly reclaimed land can be used for engineering construction after a certain level of development [4,5]. In this regard, it is crucial to minimize the settlement of infrastructure facilities in the reclamation area after construction.…”

Section: Introductionmentioning

confidence: 99%

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Anisotropy Study on the Process of Soil Permeability and Consolidation in Reclamation Areas: A Case Study of Chongming East Shoal in Shanghai

Yao,

Wang,

et al. 2023

Buildings

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Anisotropic permeability is of great significance for assessing the consolidation and drainage mode of soil layers in reclamation areas, as well as for preventing and controlling ground settlement after project construction. This paper analyzes the anisotropic permeability of the inland and nearshore soil layers in Chongming East Shoal, Shanghai, and the formation mechanism of anisotropic permeability through permeability and scanning electron microscope (SEM) tests. The results highlight that compared with dredger fill and sandy silt, the horizontal permeability coefficient of underlying soft clay (USC) is significantly higher than its vertical permeability coefficient, which is more significant in nearshore USC. Interestingly, the upper clay (21.5 m) in the thickest clay layer shows greater anisotropic permeability than the lower clay (41.5 m). Due to the instability of seepage channels, the USC anisotropic permeability increases in a fluctuating manner as the hydraulic gradient increases. Microstructural parameters are used to reveal the mechanism of anisotropic permeability, which shows that a simple soil skeleton and structure, strong particle orientation, decreased particle abundance, increased particle roundness, decreased particle contact area, and increased pore area all contribute to the enhancement of permeability. Moreover, micro-parameters have been proposed to evaluate anisotropic permeability in terms of the effective seepage-pore area. This approach addresses the constraint of water films on the permeability efficiency of USC particles.

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Geospatial intelligence in geotechnical engineering: a comprehensive investigation into SPT-N, soil types, and undrained shear strength for enhanced site characterization

Hassan,

Qasim,

Alshameri

et al. 2024

Bull Eng Geol Environ

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Geotechnical Properties of Soils – Fundamentals

Cited by 4 publications

References 10 publications

Geophysical–geotechnical methodology for assessing the spatial distribution of glacio‐lacustrine sediments: The case history of Lake Seracchi

Geophysical–geotechnical methodology for assessing the spatial distribution of glacio‐lacustrine sediments: The case history of Lake Seracchi

Anisotropy Study on the Process of Soil Permeability and Consolidation in Reclamation Areas: A Case Study of Chongming East Shoal in Shanghai

Geospatial intelligence in geotechnical engineering: a comprehensive investigation into SPT-N, soil types, and undrained shear strength for enhanced site characterization

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