Numerical analysis of Ballina test embankment on a soft structured clay foundation

Rezania, Mohammad; Nguyen, Hung; Zanganeh, Hossein; Taiebat, Mahdi

doi:10.1016/j.compgeo.2017.05.013

Cited by 29 publications

(8 citation statements)

References 33 publications

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“…It is also of interests to normalize the spreading using / , and the results can be found in Note that the measured by SI-2 is not necessary the maximum spreading, which has been reported to occur under the embankment toe (Tavenas et al 1979, Kelly et al 2018, Rezania et al 2018. Therefore, a more precise / ratio could be higher than 0.15, bringing the value closer to the empirical 0.18 as suggested in (Tavenas et al 1979).…”

Section: Lateral Spreading At Is-2 In 1979 and 2008mentioning

confidence: 86%

A Deviatoric Softening Model to Simulate Compressibility Properties of Soft Clays

Cong¹

2021

Preprint

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Soft clays are often associated with high compressibility due to their high void ratio, low shear strength, and creep behavior. Structures built on top of it can experience excessive settlement issues over a long period of time. The prediction of these settlements has attracted attentions from many researchers for over a century, but accurately predicting them still remains a difficult issue due to complex properties of soft clays, including plasticity, viscosity, anisotropy, soil structure and so forth. Therefore, studying the compressibility of soft clay is of significant importance. This dissertation aims to investigate the influence of plastic deviatoric strains on the compressibility of soft clays. First of all, the dissertation reviews a number of published incremental anisotropic consolidation tests on Finnish clays. The results demonstrate the dependence of soil compressibility on stress ratios. Based on the result, a modified yield surface size deviatoric softening law has been introduced. This softening law describes yield surface softening to be related to plastic deviatoric strain increments. Secondly, a new model named MEVP-DS, has been incorporated into the framework of Yin’s elaso-viscoplastic model to consider deviatoric softening, destructuration, and yield surface anisotropy of soft clay. Furthermore, the verification of MEVP-DS has been done through three phases. Phase one is the simulation of published incremental anisotropic consolidation tests on intact Finnish clay samples. The model results demonstrate MEVP-DS successfully captures the soil compressibility in response to different stress ratios. Phase two is the application of MEVP-DS in modeling 1-D consolidation tests on sensitive Champlain Sea clay. Model results highlight that using MEVP-DS is beneficial for predicting the compressibility and excess pore pressure response of the clay subject to constant rate of strain loading. Phase three is the application of MEVP-DS in simulating a real embankment dam on Champlain Sea clay. MEVP-DS not only simulates 40-year settlement measurements of the dam reasonably well, but also improves the prediction of lateral spreading of the dam. In summary, the MEVP-DS model proposed in this dissertation has shown to improve the simulation of soil compressibility of soft clays subject to 1-D, anisotropic and more complicated loading conditions.

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Section: Lateral Spreading At Is-2 In 1979 and 2008mentioning

confidence: 86%

A Deviatoric Softening Model to Simulate Compressibility Properties of Soft Clays

Cong¹

2021

Preprint

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“…Consideration of these complex characteristics of spoil materials necessitates the need for advanced constitutive models that may not be necessary for classical engineered embankments. Various advanced models have been developed over the years that can adequately capture the complex features of specific material behaviour (Adachi and Oka 1982;Dafalias and Taiebat 2014;Martindale et al 2013;Rezania et al 2018;Sivasithamparam et al 2015;Yin et al 2002). Constitutive models strictly adapted to spoils are not found in the literature.…”

Section: Methods Of Slope Stability Analysismentioning

confidence: 99%

Stability and characterisation of spoil heaps in European surface lignite mines: a state-of-the-art review in light of new data

et al. 2019

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The large amount of spoil material produced during the mining process imposes a significant economic and environmental liability on lignite producers. In this context, the present paper provides an overview of the geotechnical characteristics of European lignite mine spoil heaps and discusses their significance to the stability of the heaps. In order to achieve this, samples collected from spoil heaps of Polish, Czech and Greek mines are analysed and the results are compiled with data from the literature. A major conclusion drawn is that both physical and engineering properties of spoil heaps indicate a noteworthy variability, which is larger than typical in situ ground material. This is because of the additional factors affecting spoil heap deposition, such as the transportation and dumping method. Furthermore, failure mechanisms and case histories of large instabilities in lignite spoil heaps are critically discussed in order to better understand triggering failure mechanisms. It is concluded that classical assumptions made for natural soil slopes and relevant limit equilibrium models should be cautiously applied to spoil heaps. The challenges associated with numerical and probabilistic modelling of spoil heap stability, such as the inherent spatial variability of spoils and the time-dependent changes in their geotechnical properties, are also critically discussed. Finally, important research gaps in design and analysis of spoil heap stability, such as the absence of appropriate constitutive models developed specifically for spoil materials, are summarised.

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“…Researchers and engineers more popularly use Plaxis as it is friendlier in soil modelling to solve simple problems in complex strata. Beyond that point, it can analyse all cases in geotechnical engineering including pile design [84], ground foundation [85], retaining wall [86], slope stability [87], and dam [88].…”

Section: Design and Analysis Methodsmentioning

confidence: 99%

A Review of Road Embankment Stability on Soft Ground: Problems and Future Perspective

Mamat

Kasa

Razali

2019

IIUMEJ

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This paper presents an exhaustive review of the challenges faced in the construction of road embankments on soft ground and proposes a direction for future development. Frequently used techniques for soft ground improvement are discussed. The factors that contribute to the stability of the road embankment are reviewed by approach, results of past studies, and historical cases. The findings show that settlement, slope stability, and soil bearing capacity are all challenges to constructing the road embankment. Additionally, it is found that geometric data is a key factor in embankment design. Pre-loading with prefabricated vertical drain (PVDs) methods and lightweight fill were found to be widely used techniques in soft ground improvement. The information from this study can be used to develop design guidance systems, numerical modelling, and to give an overview and knowledge to other researchers who are or will conduct research in this field. Finally, future perspectives for research are related to predictions of factors that affect the stability of road embankment with an artificial intelligence approach. ABSTRAK: Kertas ini membentangkan ulasan kajian menyeluruh mengenai cabaran yang dihadapi dalam pembinaan benteng jalanraya di atas tanah lembut dan mencadangkan ke arah pembangunan kajian masa depan. Teknik-teknik penambahbaikan tanah lembut yang sering digunakan turut dibincangkan. Faktor- faktor yang menyumbang kepada kestabilan benteng jalanraya diulas dengan pendekatan kepada kajian lepas dan sejarah kes. Hasil kajian ini didapati bahawa enapan, kestabilan cerun dan keupayaan galas tanah merupakan cabaran dalam pembinaan benteng jalanraya. Selain itu, ia didapati bahawa data geometri merupakan faktor penting kepada rekabentuk benteng. Kaedah pra pembebanan dengan prefabrikasi saliran menegak (PVDs) dan isian ringan didapati teknik yang popular digunakan dalam pembaikkan tanah lembut masa kini. Maklumat dari kajian ini boleh digunakan untuk membangunkan sistem panduan reka bentuk, pemodelan berangka serta memberi gambaran dan ilmu kepada penyelidik lain yang sedang atau akan menjalankan kajian dalam bidang ini. Akhir sekali, perspektif masa depan untuk penyelidikan berkaitan ramalan faktor-faktor yang mempengaruhi kestabilan embankment jalanraya dengan pendekatan kepintaran buatan.

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Numerical analysis of Ballina test embankment on a soft structured clay foundation

Cited by 29 publications

References 33 publications

A Deviatoric Softening Model to Simulate Compressibility Properties of Soft Clays

A Deviatoric Softening Model to Simulate Compressibility Properties of Soft Clays

Stability and characterisation of spoil heaps in European surface lignite mines: a state-of-the-art review in light of new data

A Review of Road Embankment Stability on Soft Ground: Problems and Future Perspective

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