Undrained cyclic strength of marine soils

Houston, William N.; Herrmann, H.

doi:10.1016/0148-9062(81)90305-3

Cited by 3 publications

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“…This behaviour could possibly be attributed to the significantly higher clay content (75%) and larger liquid limit (LL = 55) or plasticity index (PI = 30) associated with the clay obtained from 3m depth. Similar observation was made in literature as well(Houston & Herrmann, 1980) Fig 4.9 Normalized cyclic behaviour of clay subjected to = resistance or strength under levels of 200 and 400 kPa do not show a clear trend. As noted previously, the clay specimens at this depth range have a pre consolidation pressure of about 200 kPa and thus the specimens tested under 200 and 400…”

supporting

confidence: 88%

“…Citing large variations in loading frequency or rate between monotonic and cyclic tests, Lefebvre et al (1989) argues that comparisons of strength must be made at equal loading rate; they reported threshold cyclic strength of 60% for Eastern Canadian clays, based on cyclic tests conducted at a frequency value 'equivalent' to that of monotonic tests. Houston and Herrmann (1980) conducted one way triaxial tests on various marine clays and reported threshold cyclic stress values from 18% to 90% of their static undrained strength. They concluded that the stability threshold is higher for clays with higher plasticity and decreases with decreasing Plasticity Index (PI) values.…”

Section: Cyclic Stress / Strain Amplitudementioning

confidence: 99%

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Behaviour of sensitive Leda clay under simple shear loading

Theenathayarl¹

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An experimental investigation was conducted on undisturbed sensitive Leda clay samples from the Ottawa area using a simple shear device. Both small strain and large strain tests were conducted under a range of consolidation stress levels. The Carleton University simple shear device was improved to measure shear properties at small strain amplitudes.Strength tests at large strain levels were performed in order to study the monotonic and cyclic behaviour of sensitive Leda clays, while quasi-cyclic tests were carried out to obtain material specific modulus and damping curves at small strain amplitudes.Strength tests indicate that Leda clay might reach a steady state during monotonic loading. Under cyclic loading, the clay deformed with progressively increasing cyclic strain, and liquefaction becomes a concern when cyclic stress amplitudes exceed at least 60% of their monotonic undrained shear strength. Few small amplitude stress or strain cycles do not produce significant strength loss or do not change the subsequent shear behaviour.Successful application of small strain quasi cyclic tests proved to be an optimum means of obtaining modulus reduction and damping data in the laboratory. Material specific modulus reduction and damping ratio curves are presented for Ottawa area Leda clay based on this experimental data. These results show that the behaviour of sensitive clays cannot be simply equated to that of typical non sensitive clays with high plasticity index, if accurate site response analysis results are required.ii

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confidence: 88%

Section: Cyclic Stress / Strain Amplitudementioning

confidence: 99%

Behaviour of sensitive Leda clay under simple shear loading

Theenathayarl¹

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“…Raymond et al, (1979) and Zergoun et al, (1994) also reported that the Canadian sensitive clays' threshold shear strength value is about 55% of its static shear strength. In addition, several marine clays were investigated by Houston and Herrmann (1980) under cyclic triaxial condition and they broadly stated that threshold values varied from 18% to 90% of . Also, they reported that the stability threshold is higher for clays with high plasticity and decreases with decreasing plasticity index (Ip) values.…”

Section: Cyclic Shear Stress Amplitudementioning

confidence: 99%

Cyclic Behaviour and Dynamic Properties of Soils Under Simple Shear Loading

Thirugnanasampanther¹

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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

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“…Similarly, from the experimental studies conducted with two-way undrained cyclic triaxial loading (loading with stress reversal) on normally consolidated undisturbed marine clay (Cloverdale clay), Zergoun and Vaid (1994) stated that the cyclic stress amplitude of 55% of is required to fail the sample in cyclic loading. Furthermore, Houston and Herrmann (1980) reported that the threshold cyclic stress value of marine clays varies from 18% to 90% of their , and it increases with the Plasticity Index (PI).…”

Section: Cyclic Stress / Strain Amplitudementioning

confidence: 99%

Assessment of the Dynamic Properties of Soils from Triaxial Tests

Shanmugarajah¹

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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.

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Undrained cyclic strength of marine soils

Cited by 3 publications

References 0 publications

Behaviour of sensitive Leda clay under simple shear loading

Behaviour of sensitive Leda clay under simple shear loading

Cyclic Behaviour and Dynamic Properties of Soils Under Simple Shear Loading

Assessment of the Dynamic Properties of Soils from Triaxial Tests

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