Future Strategy for Soil Investigations in Quick Clay Areas

Sandven, Rolf; Gylland, Anders Samstad; Montafia, Alberto; Pfaffhuber, Andreas Aspmo; Kåsin, Kristoffer; Long, Michael

doi:10.1007/978-3-319-56487-6_44

Cited by 1 publication

(2 citation statements)

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“…max To obtain f' in sensitive clays from CPTU, the Norwegian Institute of Technology (NTH, now NTNU) developed an effective stress limit plasticity solution for assessing f' in all soil types (Janbu & Senneset 1974;Senneset et al 1989;Sandven et al 2016). The expression for the case where c' = 0 and undrained penetration ð Þ β ¼ 0 can be expressed: Since iteration is required, an approximate inver sion to express f' directly in terms of CPTU param eters Q and B q has been devised for the following ranges: 0.05 ≤ B q < 1.0 and 18° < f' < 45° (Mayne 2007): The value of f'corresponding to large strains or maximum obliquity is obtained with this original NTH solution.…”

Section: Friction Angle Of Sensitive Presumpscot Claymentioning

confidence: 99%

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Evaluating geoparameters of Maine sensitive clay by CPTU

Mayne¹,

Paniagua²,

Buò³

et al. 2022

Cone Penetration Testing 2022

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Using two sets of analytical solutions for CPTU in clays, a suite of theoretically-consistent geoparameters is shown to be in good agreement with independent laboratory and field test results obtained on sensitive Presumpscot clay in Portland, Maine, USA. Fall cone tests indicate a mean sensitivity of S t ≈ 37. Values of undrained rigidity index (I R ), undrained shear strength (s u ), and yield stress ratio (YSR) are provided by a modified spherical cavity expansion-critical state hybrid model while an effective stress limit plasticity solution is utilized to assess the effective friction angle of the sensitive clay at both peak strength [ϕ' at q max ] and also at maximum obliquity [ϕ' at (σ 1 '/σ 3 ') max ]. A CPTU screening method that uses three simplified equations for YSR helps to identify that the clay is sensitive.

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Section: Friction Angle Of Sensitive Presumpscot Claymentioning

confidence: 99%

“…To obtain the value of f' 1 at q max , a modified NTH solution is implemented (Sandven et al 2016;Ouyang & Mayne 2019). In this case, Q in ( 4) is replaced with Q' that includes stress history: where YSR ¼σ p '=σ vo ' = yield stress ratio.…”

Section: Friction Angle Of Sensitive Presumpscot Claymentioning

confidence: 99%