Classification, soil-water characteristic curve and swelling/collapse behaviour of the Nicosia marl, Cyprus

Loukidis, Dimitrios; Bardanis, Michael; Lazarou, Georgia

doi:10.1051/e3sconf/20160911009

Cited by 6 publications

(1 citation statement)

References 4 publications

(5 reference statements)

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“…[30] presents an axisymmetric finite element (FE) model to analyze the behavior of unreinforced and geogrid reinforced bituminous pavement subjected to static and dynamic loadings. The model was loaded with an incremental loading and the critical pavement responses such as effective stress and vertical surface deflection were determined for unreinforced and geogrid reinforced flexible pavement [31]. The results indicated that during static loading, a moderate effect on the pavement behavior was observed due to the reinforcing geogrid layer.…”

Section: Introductionmentioning

confidence: 99%

Geosynthetic Reinforcement: A Strategy for Preventing Deformation of Flexible Pavements on Unstable Ground

Agbelele,

Agossou,

ZEVOUNOU

2023

Int J Res Rev

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This study assesses the effectiveness of geosynthetic reinforcement for flexible pavements on unstable ground. The methodology includes geotechnical data collection and modelling with Alizé LCPC and PLAXIS 2D 8.2. The results highlight the importance of geogrid reinforcement. Vertical deformations are reduced by the geogrids, with values of 3.44. m (phase 0 unreinforced), 2.65. m (phase 1 reinforced) and 2.07. m (phase 2 reinforced with reduced thickness). Horizontal deformations show an improvement of 117.07. % (reinforced pavement) compared with 51.54. % (reduced thickness). Vertical deformations showed a significant reduction, with 141.84. % (reinforced pavement with thickness reduction) compared with 171.32. % (reinforced pavement). In summary, geogrid reinforcement in flexible pavements offers an effective reduction in deformation. Combined with optimisation of the subgrade thickness, this strategy improves stability, strength and bearing capacity. This approach can be extrapolated to other road contexts for a better understanding of its benefits. Keywords: Geogrids, Deformations, Flexible pavements, Unstable soils

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Section: Introductionmentioning

confidence: 99%

Geosynthetic Reinforcement: A Strategy for Preventing Deformation of Flexible Pavements on Unstable Ground

Agbelele,

Agossou,

ZEVOUNOU

2023

Int J Res Rev

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Influence of dry density and wetting–drying cycles on the soil–water retention curve of compacted loess: experimental data and modeling

Yuan,

Ni,

Della Vecchia

et al. 2024

Acta Geotech.

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In this paper, the EC-5 water sensor and the MPS-6 water potential sensor were used to measure water content and suction, respectively, to investigate the evolution of soil–water retention properties of compacted loess samples prepared at different dry densities and subjected to different numbers of wetting–drying cycles. The water retention data were integrated with a detailed microstructural investigation, including morphological analysis (by scanning electron microscopy) and pore size distribution determination (by nuclear magnetic resonance). The microstructural information obtained shed light on the double porosity nature of compacted loess, allowing the identification of the effects of compaction dry density and wetting–drying cycles at both intra- and inter-aggregate levels. The information obtained at the microstructural scale was used to provide a solid physical basis for the development of a simplified version of the water retention model presented in Della Vecchia et al. (Int J Numer Anal Meth Geomech 39: 702–723, 2015). The model, adapted for engineering application to compacted loess, requires only five parameters to capture the water retention properties of samples characterized by different compaction dry densities and subjected to different numbers of wetting–drying cycles. The comparison between numerical simulations and experimental results, both original and from the literature, shows that only one set of parameters is needed to reproduce the effects of dry density variation, while the variation of only one parameter allows the reproduction of the effects of wetting and drying cycles. With respect to the approaches presented in the literature, where ad hoc calibrations are often used to fit density and wetting–drying cycle effects, the model presented here shows a good compromise between simplicity and predictive capabilities, making it suitable for practical engineering applications.

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Proving a landslide: ground behaviour problems at Pissouri, Cyprus

Hearn¹,

Larkin²,

Hadjicharalambous

et al. 2018

QJEGH

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The residential area of Limnes in Pissouri, SW Cyprus has experienced significant ground behaviour problems since heavy winter rainfall in 2011/2012. These problems have comprised cracking and displacement to the ground, pavements, roads, walls and buildings, leading to the abandonment of the most seriously-affected houses. Nicosia marl comprises the underlying lithology, a material that is associated with volume change upon wetting and drying and has led to foundation problems elsewhere in the country. Various explanations have been given to account for the observed phenomena at Limnes, including the effects of underground water , settlement, slope instability, cyclical shrink–swell, seepage erosion and dissolution. Raised water tables, caused by residential waste-water discharges, applied loads from residential buildings, and inadequate ground investigation and foundation design, are other contributory or causal factors that have been cited. A geomorphological study was undertaken in 2017 and early 2018 that combined field observations with aerial photograph interpretation, and a review of available ground investigation data, to yield an explanation and develop a preliminary ground model. The conclusion drawn was that the Limnes area had been affected by ancient (possibly late Pleistocene–early Holocene) deep-seated failure and that slope instability had subsequently been reactivated at a shallower depth within the failed material as a result of loss of material strength and high water tables. The properties of the Nicosia marl, while important in controlling the behaviour of the ground on a site-by-site basis, were considered to be aggravating factors in the context of the landslide displacement(s) affecting the slope as a whole. InSAR satellite movement monitoring data were analysed for the Limnes area and the outcome vindicated the geomorphological interpretation and helped strengthen the ground model that embodied slope failure as the underlying cause of damage.

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Classification, soil-water characteristic curve and swelling/collapse behaviour of the Nicosia marl, Cyprus

Cited by 6 publications

References 4 publications

Geosynthetic Reinforcement: A Strategy for Preventing Deformation of Flexible Pavements on Unstable Ground

Geosynthetic Reinforcement: A Strategy for Preventing Deformation of Flexible Pavements on Unstable Ground

Influence of dry density and wetting–drying cycles on the soil–water retention curve of compacted loess: experimental data and modeling

Proving a landslide: ground behaviour problems at Pissouri, Cyprus

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