Full-scale embankment failure test under simulated train loading

Lehtonen, V. J.; Länsivaara, Tim; Meehan, C. L.; Mansikkamäki, J. N.

doi:10.1680/geot.14.p.100

Cited by 7 publications

(18 citation statements)

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“…The Perniö test site is located in the southwestern coast of Finland, about 140 km west from the city of Helsinki. In October 2009, Tampere University of Technology (TUT) and the Finnish Transport Agency (FTA) conducted a full scale embankment failure test, gathering extensive amount of data on the undrained behaviour of soft clays (Lehtonen et al 2015;D'Ignazio et al 2017). The stratigraphy consists of a 1-1.5 m thick dry crust layer overlaying an 8-9 m thick soft clay layer followed by silty and stiff sandy layers located at greater depth.…”

Section: Perniömentioning

confidence: 99%

Evaluation of sample quality from different sampling methods in Finnish soft sensitive clays

et al. 2019

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The determination of reliable geotechnical parameters from laboratory testing is highly dependent on sample quality. Over the past decades, undisturbed sampling of soft sensitive clays has been performed using various apparatuses and procedures. This paper outlines details of the design and performance of a new Laval-type tube sampler employed for the investigation of five soft clay sites located in Finland. The investigation was conducted using the new tube sampler and two different piston samplers. The sample quality was evaluated based on the recompression volume during reconsolidation to the in situ effective stress in constant-rate-of-strain oedometer tests. Test results show that tube samples are generally characterized by higher quality, especially in low-plasticity clays. In particular, the quality of piston samples is highly affected by the apparatus condition and sampling operations. Furthermore, the influence of storage time on tube samples was investigated. To guarantee a proper confinement, and thus reduce swelling, a pressurized system was applied to the tube samples obtained in two soft clay sites. Results demonstrate that the sample quality is not significantly affected by storage time as long as the soil is properly stored in the tube.

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Section: Perniömentioning

confidence: 99%

Evaluation of sample quality from different sampling methods in Finnish soft sensitive clays

et al. 2019

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“…The database is compiled from data given in Gardemeister (1973), Lehtonen et al (2015), together with data from recent soil investigations performed by Tampere University of Technology, Finland (Selänpää 2015). Gardemeister (1973) collected FV and oedometer tests performed at different construction sites in Finland.…”

Section: Overview On Existing Transformation Models For Undrained Shementioning

confidence: 99%

Correlations for undrained shear strength of Finnish soft clays

et al. 2016

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The study focuses on the derivation of transformation models for undrained shear strength (su) of Finnish soft sensitive clays. Specific correlation equations for su of Finnish clays are presented in this work for the first time. Field and laboratory measurements from 24 test sites in Finland are exploited for this purpose and a multivariate database is constructed. The multivariate data consist of su from the field vane test, preconsolidation stress, vertical effective stress, liquid limit, plastic limit, natural water content, and sensitivity. The main objective is to evaluate the interdependence of su, consolidation stresses, and index parameters and provide a consistent framework for practical use. The new correlations are established through regression analyses. The constructed framework is further validated by another independent multivariate database of clays from Sweden and Norway as well as by empirical equations for Swedish and Norwegian clays. Existing correlations are evaluated for Finnish and Scandinavian clays. Finally, bias and uncertainties of the new correlations are presented.

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“…Popescu et al [30] studied the effects of random heterogeneity of soil properties on bearing capacity with various shear strength values. On the other hand, Lehtonen et al [31] investigated the effect of the trainload and the loading time on the embankment on soft soil. It is clear that careful study of the literature reveals that the soil shear strength, depth, and surcharges are the factors that influence the bearing capacity.…”

Section: Bearing Capacitymentioning

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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Full-scale embankment failure test under simulated train loading

Cited by 7 publications

References 0 publications

Evaluation of sample quality from different sampling methods in Finnish soft sensitive clays

Evaluation of sample quality from different sampling methods in Finnish soft sensitive clays

Correlations for undrained shear strength of Finnish soft clays

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

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