Behaviour of sensitive Leda clay under simple shear loading

Theenathayarl, Thayaparan

doi:10.22215/etd/2015-10761

Cited by 3 publications

(25 citation statements)

References 62 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Index properties of the tested clays have been determined from laboratory tests (Atterberg, gradation, water content etc.) and from previously reported values by Blanchette (2014), Theenathayarl (2015) and Thirugnanasampanther (2016) for the same material.…”

Section: Leda Clay Propertiessupporting

confidence: 76%

“…Several researchers have taken time to study the behavior of Leda clay due to its sensitivity, and they include Mitchell and King (1976); Silvestri et al (1989); Theenathayarl (2015); and Thirugnanasampanther, (2016). Recently, Theenathayarl (2015) and Thirugnanasampanther (2016) asserted that dynamic properties of sensitive Leda clay do not follow any particular published curves in the literature.…”

Section: List Of Symbolsmentioning

confidence: 99%

“…However, it is strongly recommended that site specific modulus reduction and damping curves must be used for sensitive clays and cemented sands, as they may deviate from the proposed sets of curves (e.g. Theenathayarl, 2015;Thirugnanasampanther, 2016).…”

Section: Modulus Reduction and Damping Curvementioning

confidence: 99%

“…Similar stress -strain behavior for sensitive clays has been reported by many researchers (e.g. Lee, 1979;Lefebvre at al., 1989;Theenathayarl, 2015;Thirugnanasampanther, 2016).…”

Section: Monotonic Behavior Of Leda Claymentioning

confidence: 99%

See 3 more Smart Citations

Assessment of the Dynamic Properties of Soils from Triaxial Tests

Shanmugarajah¹

View full text Add to dashboard Cite

A detailed laboratory testing programme was conducted on undisturbed sensitive Leda clay samples obtained from Quebec area (Breckenridge and Outardes-2) and on relatively uniform sands (Fraser River sand and Ottawa sand) under triaxial loading mode. Monotonic and cyclic behavior of sensitive Leda clay were studied by performing large strain tests at various consolidation conditions. Small strain stress controlled quasicyclic tests were conducted on both clay and sand to establish site-specific modulus reduction and damping ratio curves at small strain amplitudesThe shear strength and cyclic resistance of Leda clay under triaxial testing mode is noted to be significantly higher than the previously reported values under simple shear loading conditions. Further, it is confirmed that both consolidation stress and over consolidation ratio influence the monotonic shear strength of clay.Site specific modulus reduction and damping ratio curves are proposed for Leda clay, Fraser River sand and Ottawa sand. The proposed dynamic curves for Leda clay indicate that the behavior of sensitive clays does not follow any particular curve proposed in the literature for non-sensitive clays. These results also suggest that modulus reduction and damping curves are loading path dependent.iii Acknowledgements I would like to devote my sincere gratitude to my research supervisor, Professor Siva Sivathayalan for his continuous guidance, encouragement, understanding and support throughout my years at Carleton University which gave me a lot of comfort to complete my Masters research programme successfully. It has been a great pleasure to work with him.

show abstract

Section: Leda Clay Propertiessupporting

confidence: 76%

Section: List Of Symbolsmentioning

confidence: 99%

Section: Modulus Reduction and Damping Curvementioning

confidence: 99%

“…Similar stress -strain behavior for sensitive clays has been reported by many researchers (e.g. Lee, 1979;Lefebvre at al., 1989;Theenathayarl, 2015;Thirugnanasampanther, 2016).…”

Section: Monotonic Behavior Of Leda Claymentioning

confidence: 99%

See 2 more Smart Citations

Assessment of the Dynamic Properties of Soils from Triaxial Tests

Shanmugarajah¹

View full text Add to dashboard Cite

show abstract

“…During the last glacial era, glaciers covered many areas of the world, especially in the northern regions of the earth (e.g, Alaska, Canada, Sweden, and Norway). These areas are found to contain these problematic soils (Theenathayarl 2015). The provinces of Quebec and Ontario (particularly in the Ottawa region) in Canada have sensitive marine clays (locally called Leda clay or Champlain sea clay), which cover relatively large areas.…”

Section: Introductionmentioning

confidence: 99%

GIS-based modeling of snowmelt-induced landslide susceptibility of sensitive marine clays

Al-Umar

Fall

Daneshfar

2020

Geoenviron Disasters

View full text Add to dashboard Cite

In this study, a simulation tool, based on the combination of Geographic Information System (GIS) and Grid-Based Regional Slope-Stability Model (TRIGRS), is developed to assess and predict the snowmelt-induced landslides in areas of sensitive marine clays in the Ottawa region (Canada). Topographic, geologic, hydrologic, and geotechnical information of the study area, in addition to snowmelt intensity data for different periods, was required to conduct this modeling study. Snowmelt intensity records for periods of 6-48 h, 3-15 days, 25 days, and 30 days, as well as the information on historical landslides in the study area, were used to examine both the timing and location of shallow landslides due to snowmelt across the Ottawa region. The developed tool is validated by comparing the predicted landslide-susceptible areas with the historical landslide maps in the study area. A good agreement between the predicted and recorded historical landslides was obtained, which suggests that the developed GIS-TRIGRS based tool can predict relatively well the snowmelt-induced landslide susceptibility in the sensitive marine clays. The modeling results show that high slope areas of sensitive marine clays are more prone to snowmeltinduced landslides. As a result, this simulation tool could be used to assess and/or predict snowmelt-induced landslides in different areas of the Ottawa region, which is an important means for decision-making processes with respect to protecting the population and infrastructure against snow-melt induced marine clay landslides.

show abstract

Cyclic Behaviour and Dynamic Properties of Soils Under Simple Shear Loading

Thirugnanasampanther¹

View full text Add to dashboard Cite

An experimental study was carried out on sensitive clays obtained from Ottawa-Quebec area (Kinburn, ON, Breckenridge and Outardes-2, QC) and relatively uniform sand obtained from the Fraser Delta (BC). Large strain tests were conducted at over consolidated and normally consolidated states to investigate the monotonic and cyclic behaviour of sensitive clays. Small strain tests were carried out over a range of consolidation stress levels to investigate the dynamic properties of clays and Fraser River sand. All tests were performed using the Carleton University simple shear device, which was modified to enable confident measurements at very small strains.Test results show that shear strength of clays is influenced by consolidation stress, over consolidation ratio and clay content. Further, this study reveals that these sensitive clays at the tested sites have relatively strong cyclic resistance at in-situ stress level, but cyclic resistance decreased significantly if the clays are normally consolidated.Site-specific modulus reduction and damping ratio curves are proposed for Ottawa-Quebec area clays and Fraser River sand. These site-specific curves are unique for sensitive clays and cannot be equated to any curves published in the literature. The curves generated for Fraser River sand are close to the average and lower bound curves reported in the literature for sands.ii

show abstract

Behaviour of sensitive Leda clay under simple shear loading

Cited by 3 publications

References 62 publications

Assessment of the Dynamic Properties of Soils from Triaxial Tests

Assessment of the Dynamic Properties of Soils from Triaxial Tests

GIS-based modeling of snowmelt-induced landslide susceptibility of sensitive marine clays

Cyclic Behaviour and Dynamic Properties of Soils Under Simple Shear Loading

Contact Info

Product

Resources

About