Liquefaction Resistance of a Silty Sand Deposit Subjected to Preshaking Followed by Extensive Liquefaction

El-Sekelly, Waleed; Abdoun, Tarek; Dobry, Ricardo

doi:10.1061/(asce)gt.1943-5606.0001444

Cited by 39 publications

(10 citation statements)

References 31 publications

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“…Recent studies have used shaking table and centrifuge tests to examine the relative effects of cyclic loading on DR, Vs, qc, and liquefaction resistance. Centrifuge tests conducted by El-Sekelly et al (2015 on saturated silty sand models found DR increased by 38-50% and Vs increased by less than 10% after being subjected to low to mid-level pre-shaking events. Liquefaction resistance (measured by excess pore pressure generation) was found to increase overall following pre-shaking, though stronger pre-shaking events were found to temporarily decrease liquefaction resistance.…”

Section: Shaking Table Tests On Saturated Sands Bymentioning

confidence: 96%

Progressive Changes in Liquefaction and Cone Penetration Resistance across Multiple Shaking Events in Centrifuge Tests

Darby

Boulanger

DeJong

et al. 2019

J. Geotech. Geoenviron. Eng.

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The effects of shaking history on CPT based liquefaction triggering correlations for clean saturated sand are examined using cone penetration resistance and cyclic strength data pairs from dynamic centrifuge model tests. Three model tests on a 9-m radius centrifuge examine liquefaction responses of level profiles of saturated Ottawa F-65 sand subjected to multiple (17 to 29) shaking events that produced successive changes in density and model response characteristics. Inverse analysis of data from dense accelerometer arrays are used to define time series of cyclic stress ratios and shear strains throughout the profile. Cyclic resistance ratios against triggering of ~100% excess pore pressure ratio in 15 equivalent uniform cycles are computed at multiple depths based on weighting of the cyclic stress ratio time series up to the time of triggering. Cone penetration tests performed at select times during each model test are used to define the variation in cone tip resistances with depth and shaking history. The resulting data pairs, with normalized cone tip resistances ranging from 20 to 340 and cyclic resistance ratios ranging from 0.1 to 2.0, show that both quantities progressively increase as a result of recurrent liquefaction events, and generally follow the trends predicted by case history based liquefaction triggering correlations. Three 1-m radius centrifuge tests of similar configurations produced consistent results. Implications for the interpretation of case histories and engineering practice are discussed.

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Section: Shaking Table Tests On Saturated Sands Bymentioning

confidence: 96%

Progressive Changes in Liquefaction and Cone Penetration Resistance across Multiple Shaking Events in Centrifuge Tests

Darby

Boulanger

DeJong

et al. 2019

J. Geotech. Geoenviron. Eng.

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“…The effect of repeated shaking events on the cyclic strength of saturated, uncemented sands has been examined in a number of prior centrifuge studies (e.g. Sharp et al 2010, Su et al 2013, El-Sekelly et al (2015, Darby et al (2016Darby et al ( , 2019, Dobry et al 2015, Dobry and, Okamura et al 2017, Wang et al (2018). Darby et al (2016Darby et al ( , 2019 performed dynamic centrifuge tests conducted on loose and dense, clean, uncemented, saturated Ottawa sands subjected to repeated shaking events, and demonstrated that the normalized qc and cyclic resistance ratio (CRR) gradually increased due to past shaking and repeated liquefaction events.…”

Section: Introductionmentioning

confidence: 99%

“…Additional centrifuge studies have observed qc to be more sensitive to the effects of shaking history than Vs measurements (Dobry and Abdoun 2017). El-Sekelly et al (2015 conducted a set of centrifuge tests on saturated silty sand models and observed that although low amplitude repeated shaking significantly increased liquefaction resistance, the increase was not reflected by the increase in Vs (less than 10% increase). An additional study observed that extensive liquefaction resulted in a temporary decrease in liquefaction resistance (El-Sekelly et al 2016).…”

Section: Introductionmentioning

confidence: 99%

Centrifuge Model Testing of Liquefaction Mitigation via Microbially Induced Calcite Precipitation

Darby

Hernandez²,

DeJong

et al. 2019

J. Geotech. Geoenviron. Eng.

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A set of saturated Ottawa sand models were treated with Microbially Induced Calcite Precipitation (MICP) and subjected to repeated shaking events using the 1-m radius centrifuge at the UC Davis Center for Geotechnical Modeling. Centrifuge models were constructed to initial relative densities (DR0) of approximately 38% and treated to light, moderate, and heavy levels of cementation (calcium carbonate contents by mass of approximately 0.8%, 1.4%, and 2.2%, respectively) as indicated by shear wave velocities (light ≈200 m/s, moderate ≈325 m/s, and heavy ≈600 m/s). The cemented centrifuge models are compared to a pair of uncemented saturated Ottawa sand models with initial DR0s of ≈38 and ≈53% and subjected to similar levels of shaking. Cone penetration resistances and shear wave velocities are monitored throughout shaking to investigate (1) the effect of cementation on cone penetration resistance, shear wave velocity, and cyclic resistance to liquefaction triggering and (2) the effect of shaking on cementation degradation. Accelerometers, pore pressure transducers, and a linear potentiometer are used to monitor the effect of cementation on liquefaction triggering and consequences. Cone penetration resistances and shear wave velocities are sensitive to light, moderate, and heavy levels of cementation (increases in penetration resistance from 2 to 5 MPa, 2 to 10 MPa, and 2 to 18 MPa and shear wave velocity from 140 to 200 m/s, 140 to 325 m/s, and 140 to 660 m/s, respectively), and are able to capture the effects of cementation degradation.

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“…That is, the same site that may have liquefied because of an earthquake just after deposition may not liquefy again by a similar earthquake after being subjected to tens of earthquakes throughout its history. This conclusion could not have been reached without integrating the results of the centrifuge experiment with the instrumented field deposit [6,9,10].…”

Section: Field Performance Versus Centrifuge Testingmentioning

confidence: 98%

Recent advances in physical modeling and remote sensing of civil infrastructure systems

Abdoun

El-Sekelly

2017

Innov. Infrastruct. Solut.

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Natural and man-made hazards are often associated with costly damages to civil infrastructure systems, such as buildings, bridges, Levees, dams, pipelines and offshore structures of all types. The lack of high-quality field and lab data of soil system response have eluded researchers and practitioners until recently. Recent advancements in physical modeling facilities (centrifuge and full scale) and advancement in remote sensing technology are leading to a new reality for the health assessment of soil-structure systems. This new reality is leading to a paradigm shift in the evaluation and modeling of soilstructure systems. Physical modeling, remote sensing and computational simulations are destined to replace the current empirical approaches and will ultimately become the main tool for analysis and design of soil-structure systems. The paper discusses the results of recent research studies utilizing physical modeling to simulate the response of critical soil-structure systems to natural and man-made hazards.

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Liquefaction Resistance of a Silty Sand Deposit Subjected to Preshaking Followed by Extensive Liquefaction

Cited by 39 publications

References 31 publications

Progressive Changes in Liquefaction and Cone Penetration Resistance across Multiple Shaking Events in Centrifuge Tests

Progressive Changes in Liquefaction and Cone Penetration Resistance across Multiple Shaking Events in Centrifuge Tests

Centrifuge Model Testing of Liquefaction Mitigation via Microbially Induced Calcite Precipitation

Recent advances in physical modeling and remote sensing of civil infrastructure systems

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