Modeling Delayed Flow Liquefaction Initiation after Cyclic Loading

Zhenhao Shi, Ferdinando Marinelli, Giuseppe Buscarnera

Research output: Contribution to journalConference article

Abstract

Ground shaking during earthquakes can be a prominent cause of strength loss in loose saturated soils. In some cases, uncontrolled pore pressure build-up and liquefaction may occur with a time lag with respect to strong ground motion, especially when the time-dependent properties of the soil interact with the constraints brought by undrained and/or partially drained conditions. Here a rate-dependent law based on the critical state theory has been used to replicate the cyclic response of sand by taking into account density effects. The model equations have been inspected to define indices of delayed undrained instability. Then, the model has been calibrated by considering laboratory tests for both monotonic and cyclic undrained loading on loose Hostun sand. Numerical simulations of undrained creep stages following cyclic loading have been performed to illustrate the transition from stable to unstable creep as a function of the number of cycles, thus providing a conceptual framework to evaluate the risk of delayed flow liquefaction in loose sandy deposits.

Original languageEnglish (US)
Pages (from-to)212-220
Number of pages9
JournalGeotechnical Special Publication
Volume2018-June
Issue numberGSP 292
DOIs
StatePublished - Jan 1 2018
Event5th Geotechnical Earthquake Engineering and Soil Dynamics Conference: Numerical Modeling and Soil Structure Interaction, GEESDV 2018 - Austin, United States
Duration: Jun 10 2018Jun 13 2018

Fingerprint

flow modeling
cyclic loading
Liquefaction
liquefaction
creep
Creep
Sand
Soils
sand
critical state
Pore pressure
conceptual framework
pore pressure
ground motion
Earthquakes
Deposits
soil
earthquake
Computer simulation
simulation

ASJC Scopus subject areas

  • Civil and Structural Engineering
  • Architecture
  • Building and Construction
  • Geotechnical Engineering and Engineering Geology

Cite this

Shi, Zhenhao ; Marinelli, Ferdinando ; Buscarnera, Giuseppe. / Modeling Delayed Flow Liquefaction Initiation after Cyclic Loading. In: Geotechnical Special Publication. 2018 ; Vol. 2018-June, No. GSP 292. pp. 212-220.
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Modeling Delayed Flow Liquefaction Initiation after Cyclic Loading. / Shi, Zhenhao; Marinelli, Ferdinando; Buscarnera, Giuseppe.

In: Geotechnical Special Publication, Vol. 2018-June, No. GSP 292, 01.01.2018, p. 212-220.

Research output: Contribution to journalConference article

TY - JOUR

T1 - Modeling Delayed Flow Liquefaction Initiation after Cyclic Loading

AU - Shi, Zhenhao

AU - Marinelli, Ferdinando

AU - Buscarnera, Giuseppe

PY - 2018/1/1

Y1 - 2018/1/1

N2 - Ground shaking during earthquakes can be a prominent cause of strength loss in loose saturated soils. In some cases, uncontrolled pore pressure build-up and liquefaction may occur with a time lag with respect to strong ground motion, especially when the time-dependent properties of the soil interact with the constraints brought by undrained and/or partially drained conditions. Here a rate-dependent law based on the critical state theory has been used to replicate the cyclic response of sand by taking into account density effects. The model equations have been inspected to define indices of delayed undrained instability. Then, the model has been calibrated by considering laboratory tests for both monotonic and cyclic undrained loading on loose Hostun sand. Numerical simulations of undrained creep stages following cyclic loading have been performed to illustrate the transition from stable to unstable creep as a function of the number of cycles, thus providing a conceptual framework to evaluate the risk of delayed flow liquefaction in loose sandy deposits.

AB - Ground shaking during earthquakes can be a prominent cause of strength loss in loose saturated soils. In some cases, uncontrolled pore pressure build-up and liquefaction may occur with a time lag with respect to strong ground motion, especially when the time-dependent properties of the soil interact with the constraints brought by undrained and/or partially drained conditions. Here a rate-dependent law based on the critical state theory has been used to replicate the cyclic response of sand by taking into account density effects. The model equations have been inspected to define indices of delayed undrained instability. Then, the model has been calibrated by considering laboratory tests for both monotonic and cyclic undrained loading on loose Hostun sand. Numerical simulations of undrained creep stages following cyclic loading have been performed to illustrate the transition from stable to unstable creep as a function of the number of cycles, thus providing a conceptual framework to evaluate the risk of delayed flow liquefaction in loose sandy deposits.

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