Evaluation of porosity and degree of saturation from seismic and electrical data

Cosentini, Renato Maria; Foti, Sebastiano

doi:10.1680/geot.13.p.075

Cited by 20 publications

(8 citation statements)

References 30 publications

(30 reference statements)

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“…Settlement and consolidation processes fostered by wetting and drying meteorological cycles after the landslide events could have increased the soil density at the toe (Craig 2004;Head and Epps 2011). The plastic nature of the bare soil, related to the soil fine fraction (see BStudy site^section), may have contributed to an increase in soil firmness at the middle stratum following wetting and drying cycles (Consentini and Foti 2014). As a result, SRP increased in the exposed strata subject to slope failure (i.e.…”

Section: Discussionmentioning

confidence: 99%

Shallow landslides as drivers for slope ecosystem evolution and biophysical diversity

González-Ollauri

Mickovski

2017

Landslides

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Shallow landslides may be seen as local disturbances that foster the evolution of slope landscapes as part of their selfregulating capacity. Gaining insight into how slope ecosystems function and evolve could make eco-engineering interventions on slopes more successful. The objective of the present study is to detect traits of shallow landslide-triggered ecosystem evolution, self-regulation and biophysical diversity in a small-scale landslide-prone slope in Northeast Scotland. A protocol was defined to explore the emergence of landslide-driven slope habitats. This protocol studied plant diversity, species richness and plant biomass differences and their interactions with certain soil and topographic attributes at three slope strata during two consecutive growing seasons following an assemblage of shallow landslide events. Plant species and soil properties with potential as indicators of the different landslide-driven slope habitats and landscape evolution were also considered. Shallow landslides contributed to biophysical diversity and created distinct slope habitats within the landscape. Habitat differences in terms of species richness and composition were a direct consequence of the slope self-regulation. Certain plant species were found to be valid indicators of landslide-driven biophysical diversity. Soil total nitrogen and resistance to penetration were related to slope habitat and landscape evolution. As expected, plant establishment relied upon light and nitrogen trade-offs, which in turn were influenced by landscape topography. The insights derived from this study will be useful in slope restoration, particularly in harmonising effective actions with the functioning of landslide-prone ecosystems. Further research directions to clarify the observed variability and interactions are highlighted.

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Section: Discussionmentioning

confidence: 99%

Shallow landslides as drivers for slope ecosystem evolution and biophysical diversity

González-Ollauri

Mickovski

2017

Landslides

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“…Hardin and Richart (1963) and Richart et al (1970) showed stiffness to be linearly dependent on void ratio for uncemented sands, and Viggiani and Atkinson (1995) showed broad linear dependence of clay stiffness on the overconsolidation ratio. In partially saturated soils, there is an additional contribution to stiffness from suctions, which Whalley et al (2012) related to net stress and the matric potential, and Cosentini and Foti (2014) related to soil porosity and saturation by using the van Genuchten equation.…”

Section: Embankment Characterisation and Imaging Usingmentioning

confidence: 99%

Aged embankment imaging and assessment using surface waves

Gunn

Dashwood

Bergamo

et al. 2016

Proceedings of the Institution of Civil Engineers - Forensic En

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Rapid, non-intrusive surface wave surveys provide depth profiles from which ground models can be generated for use in earthwork condition assessment. Stiffness throughout earthworks controls the behaviour under static and dynamic loads, and characterising heterogeneity is of interest in relation to the stability of engineered backfill and life-cycle deterioration in aged utility and transportation infrastructure. Continuous surface wave methods were used to identify interfaces between fine-and coarse-grained fill in an end-tipped embankment along the Great Central Railway in Nottinghamshire, UK. Multichannel analysis of surface wave (MASW) methods were used to characterise subsurface voiding in a canal embankment along the Knottingley and Goole canal near Eggborough, Yorkshire. MASW methods are currently being used to study extreme weather impacts on the stability of a highplasticity clay embankment along the Gloucestershire-Warwickshire railway near Laverton. Optimal results were obtained using equipment capable of generating and detecting over wide frequency ranges. Notation

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“…Stiffness is related to the shear strength of the solid framework matrix, which is strongly influenced by mineralogy, and hence, the size, shape, friction and interactions between adjacent grains comprising the soil skeleton (Gunn, 2003;Donohue and Long, 2010). Density and shear strength are controlled by the degree of consolidation of the soil fabric, often expressed using the voids ratio or porosity, and the moisture content, often expressed as the proportion of saturation (Whalley et al, 2012;Consentini and Foti, 2014). Graingrain contact and friction increase and porosity decreases as a soil consolidates, for example with increasing burial depth.…”

Section: Introductionmentioning

confidence: 99%

Surface wave surveys for imaging ground property changes due to a leaking water pipe

Dashwood

Gunn

Curioni

et al. 2020

Journal of Applied Geophysics

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This study demonstrates the use of Multi-channel Analysis of Surface Waves (MASW) to measure changes in Rayleigh wave velocity relating to both the initial trench construction and subsequent simulated failures (water leaks) of a buried water-pipe. The MASW field trials were undertaken in conjunction with a wider suite of geophysical monitoring techniques at a site in Southwest England, within an area of clayey sandy SILT. The Rayleigh wave velocity through a soil approximately equals the shear wave velocity, which in turn is predominantly dependant on the shear modulus of the soil (G) and this can be inferred to give a measure of the relative strength of a soil. It is proposed that the time-lapse measurement of Rayleigh wave velocity may be used to monitor ongoing changes in soil strength and therefore the MASW technique could perform a significant role in monitoring the initiation/progression of any internal processes within a geotechnical asset, before they would otherwise be identified through visual inspection alone.

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Evaluation of porosity and degree of saturation from seismic and electrical data

Cited by 20 publications

References 30 publications

Shallow landslides as drivers for slope ecosystem evolution and biophysical diversity

Shallow landslides as drivers for slope ecosystem evolution and biophysical diversity

Aged embankment imaging and assessment using surface waves

Surface wave surveys for imaging ground property changes due to a leaking water pipe

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