Searched for: author%3A%22Jommi%2C+C.%22
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Cardoso, Rafaela (author), Ramon-Tarragona, Anna (author), Lourenço, Sérgio (author), Mendes, João (author), Caruso, Marco (author), Jommi, C. (author)
Monitoring structural behavior of earth structures during construction and in service is a common practice done for safety reasons, consolidation control and maintenance needs. Several are the techniques available for measuring displacements, water pressures and total stresses, not only in these geotechnical structures but also at their...
book chapter 2023
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Zhao, H. F. (author), Jommi, C. (author)
Peats are encountered in waterlogged deltaic areas, where degradation is delayed by favourable environmental conditions. The recent increase in frequency and severity of droughts is expected to accelerate peat degradation, in turn increasing subsidence and flood risk, urging better understanding of the response of peats to drying events. To...
journal article 2022
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Ponzoni, Elisa (author), Nocilla, Alessandra (author), Jommi, C. (author)
A recent increase in frequency and severity of exceptional climatic events is of concern for the stability of natural and artificial slopes. These undergo continuous evaporation and infiltration cycles, which change the suction distribution and trigger shrinkage, swelling, cracking, and surfi-cial erosion, overall decreasing the soil strength...
journal article 2021
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Muraro, S. (author), Jommi, C. (author)
Conventional triaxial tests on peats are strongly criticised due to the very high shear strength parameters obtained from standard data elaboration, leading to unrealistic factors of safety when used in geotechnical design and assessment. Various operational approaches have been proposed in the literature to overcome this difficulty; however,...
journal article 2021
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Jommi, C. (author), Chao, C. (author), Muraro, S. (author), Zhao, H.F. (author)
Recent research effort carried out at Delft University of Technology to improve the experimental knowledge and develop a comprehensive modelling approach for fibrous organic soils is summarised. Experimental results and numerical analyses are combined to discuss some contradictory results which have delayed advanced characterisation of peats....
journal article 2021
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Azizi, Arash (author), Musso, Guido (author), Jommi, C. (author)
Soils used in earth construction projects are mostly unsaturated, and they undergo frequent drying–wetting cycles (repeated hydraulic loads) due to changes in climatic conditions or variations of the ground water level, particularly at shallow depths. After compaction, changes in water content can significantly influence the hydromechanical...
journal article 2020
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van Paassen, L.A. (author), Oliveira, Bruna R.F. (author), Zain, Nor H.M. (author), Jommi, C. (author)
Many low-lying peatlands in delta areas undergo significant subsidence due to drainage for agricultural purposes. Subsidence may be attributed to shrinkage, consolidation or oxidation. At the same time the canals and ditches are regularly dredged to maintain water quality and drainage capacity. Often these dredged sediments are placed on land...
journal article 2020
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Muraro, S. (author), Jommi, C. (author)
The paper assesses fully coupled hydro-mechanical numerical approaches developed for unsaturated soils to model the effect of free gas overpressure on the response of peat layers. A simple linear model is used for the soil skeleton, however, the global response is non-linear due to changes over time of the compressibility of the solid...
journal article 2020
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Chao, C. (author), Bakker, M.C.M. (author), Jommi, C. (author)
A simple numerical model was set up to investigate the hydraulic behaviour of a regional dyke to improve understanding of the response under variable atmospheric conditions. The unsaturated hydraulic properties of the dyke body and the relevant foundation layers were calibrated either on the results of laboratory tests or on a national...
journal article 2020
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Musso, Guido (author), Azizi, Arash (author), Jommi, C. (author)
The paper focuses on the hydromechanical behaviour of an unsaturated compacted clayey silt, accounting for fabric changes induced by drying–wetting cycles occurring at low stress levels. The response along isotropic compression and triaxial compression (shear) at constant water content was investigated by laboratory tests on both as-compacted...
journal article 2020
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Muraro, S. (author), Jommi, C. (author)
This paper discusses the results of an experimental programme designed to investigate the deviatoric behaviour of peats. The results are obtained from triaxial experiments carried out on reconstituted peat samples. The interpretation of the experimental results follows a hierarchical approach in an attempt to derive the ingredients that an...
journal article 2020
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Kool, J.J. (author), Kanning, W. (author), Jommi, C. (author), Jonkman, Sebastiaan N. (author)
Hindcasting of past levee failures enhances insights in the performance and vulnerability of levees. The scarcity of field evidence makes identifying the cause(s) of failure difficult. Under these circumstances, multiple scenarios and model choices are possible to characterise and to model the failure. This paper shows how probabilistic...
journal article 2020
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Zhao, H.F. (author), Muraro, S. (author), Jommi, C. (author)
Increasing climatic stresses accelerate the degradation of highly organic soils, like peat, by increasing their drying rate above the water table and their decomposition rate under water. Recent experimental studies provide evidence of the consequences of these processes on the hydro-mechanical properties of peat. However, modelling the...
journal article 2020
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Kool, J.J. (author), Kanning, W. (author), Heyer, Torsten (author), Jommi, C. (author), Jonkman, Sebastiaan N. (author)
Forensic analysis of past failures is valuable to improve our understanding of levee behavior. In this article a new systematic approach of forensic analysis for levee failures is proposed and applied to the Breitenhagen levee breach that occurred along the river Saale in Germany in 2013. The purpose of this study is to identify the cause of the...
journal article 2019
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Garuti, Dario (author), Jommi, C. (author), Rijkers, Richard (author)
In the assessment of water defences for macrostability and backward erosion piping the design hydraulic load mostly refers to steady state conditions in equilibrium with the maximum river water level. In this contribution, we show selected results of coupled hydromechanical numerical analyses of a paradigmatic Dutch case, which demonstrate that...
book chapter 2019
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Jommi, C. (author), Muraro, S. (author), Trivellato, Edoardo (author), Zwanenburg, C. (author)
Direct observation of gas in peat layers, generated by slow degradation in anoxic conditions, raised concern in the Netherlands about its potential impact on the geotechnical response of dykes founded on peat. To address this issue, an experimental investigation was initiated, aimed at quantifying the main consequences of the presence of gas...
journal article 2019
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Kool, J.J. (author), Kanning, W. (author), Jommi, C. (author), Jonkman, S.N. (author)
The hindcasting of levee failures can provide valuable information about levee strength, strength models and dominant factors that contribute to failure. It is however not always clear how and why a levee failed as evidence (such as detail subsoil composition) is not present anymore.
abstract 2017
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Tarantino, Alessandro (author), Gallipoli, Domenico (author), Jommi, C. (author), Mendes, Joao (author), Capotosto, Anastasia (author), Amabile, Alessia (author), Pedrotti, Matteo (author), Pozzato, Annarita (author), Beneš, Vojtěch (author), Bottaro, F. (author), Denzer, Heiner (author), Boeck, Fabian (author)
The paper presents results achieved within the project MAGIC, a project funded by the European Commission under the Marie-Curie Industry Academia Partnerships and Pathways (IAPP) scheme. The project MAGIC aims to advance the state-of-the art in the monitoring of geo-structures subjected to climate loading by filling some of the gaps in...
conference paper 2016
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Jommi, C. (author), Della Vecchia, Gabriele (author)
Modelling the water retention behaviour requires proper understanding of all the processes which affect the amount of water stored in the pore network, depending on the soil state and the soil history. Traditionally, in many applications a single water content - suction curve is used. This approach limits the applicability of the retention...
conference paper 2016
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Jommi, C. (author), Valimberti, N. (author), Tollenaar, Roderick N. (author), Della Vecchia, Gabriele (author), van Paassen, L.A. (author)
Desiccation cracks are usually thought to start from the surface of an evaporating soil layer, and the available simplified models for crack initiation and propagation are based on this hypothesis. On the contrary, experimental results on a Dutch river clay showed that cracks in an evaporating soil layer may start and propagate below the...
conference paper 2016
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