Effect of Non-plastic Fines on Cyclic Shear Strength of Sand Under an Initial Static Shear Stress

Porcino, D.; Diano, Valentina; Tomasello, Giuseppe

doi:10.1007/978-3-319-97112-4_133

Cited by 3 publications

(1 citation statement)

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“…However, there are many geotechnical applications, such as beneath earth dams, embankments, slopes and nearbuilding structures, where soil elements are subjected to an initial static shear stress (τ stat ) on the horizontal plane, which can modify the CRR and the failure modes of silty sands. Case histories of liquefaction-induced failure in clean sands and silty sands in the presence of an initial static shear stress during several earthquakes were reported by Chiaro and Koseki (2013), Kokusho (2020), Diano (2016), andWei et al (2018) but only a limited number of studies concern laboratory investigation of undrained cyclic behaviour of silty sands with different f c considering an initial static shear effect (Kokusho 2020;Pan et al 2020Pan et al , 2021Porcino and Diano 2016;Porcino et al 2018b;Tomasello and Porcino 2023;Wei and Yang 2019b;Wei et al 2023;Zhou et al 2023).…”

Section: Background and Literature Reviewmentioning

confidence: 99%

Assessment of undrained cyclic resistance of sand with non-plastic fines under sustained shear stress using a critical state interpretation

Tomasello,

Porcino

2024

Bull Eng Geol Environ

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There are many geotechnical applications involving dams, embankments and slopes where the presence of an initial static shear stress prior to the cyclic loadings plays an important role. The current paper presents the experimental results gathered from undrained cyclic simple shear tests carried out on non-plastic silty sand with fines content in the range 0-30% with the consideration of sustained static shear stress ratio (α). Two distinct parameters, namely the conventional state parameter Ψ, and the equivalent state parameter Ψ*, are introduced in the context of critical state soil mechanics (CSSM) framework to predict failure mode and undrained cyclic resistance (CRR) of investigated soils. It is proved that the failure patterns for silty sands are related to (a) the initial states of soils (Ψ or Ψ*) and (b) the combination of initial shear stress with respect to cyclic loading amplitude. At each α, the CRR-Ψ (or Ψ*) correlation can be well represented by an exponential trend which is practically unique for both clean sands and silty sands up to a threshold fines content (fthre≅24.5%). Varying α from low to high levels simply brings about a clockwise rotation of the CRR-Ψ (or Ψ*) curves around a point. This CRR-Ψ (or Ψ*) platform thus provides an effective methodology for investigating the impact of initial shear stress on the cyclic strength of both clean sands and silty sands. The methodology for estimating Ψ (or Ψ*) state parameters from in-situ cone penetration tests in silty sands is also discussed.

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