Proposed outline for LEAP verification and validation processes

Kutter, B.L.; Manzari, M; Zeghal, Mourad; Zhou, Yang; Armstrong, Richard J.

doi:10.1201/b17438-13

Cited by 16 publications

(8 citation statements)

References 3 publications

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“…LEAP is an international collaboration aiming to establish rigorous protocols for validation of soil liquefaction numerical models for practical applications (Kutter et al 2015;Manzari et al 2015). LEAP has several exercises focusing on different aspects of liquefaction (Carey et al 2017).…”

Section: Introductionmentioning

confidence: 99%

Specifications and Results of Centrifuge Model Test at Zhejiang University for LEAP-UCD-2017

Zhou

et al. 2019

Model Tests and Numerical Simulations of Liquefaction and Lateral Spreading

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Three dynamic centrifuge tests with different densities (corresponding to loose, medium dense, and dense deposits) were conducted at Zhejiang University for LEAP-UCD-2017 for an exercise of repeatability and reproducibility. The same model used in LEAP-GWU-2015 representing a 5-degree slope consisting of saturated Ottawa F-65 was repeated in 2017, but more rigorous protocols and new techniques (CPT and high-speed cameras) were included in Zhejiang University experiments. Test facilities and detailed modeling and testing procedures are presented; uncertainties in input parameters are also discussed. Preliminary results associated with selected experiment are presented.

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Section: Introductionmentioning

confidence: 99%

Specifications and Results of Centrifuge Model Test at Zhejiang University for LEAP-UCD-2017

Zhou

et al. 2019

Model Tests and Numerical Simulations of Liquefaction and Lateral Spreading

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“…The calibration of the model to the results of laboratory experiments conducted on the designated soil for LEAP (Ottawa F-65 sand) is described. This is followed by a description of the simulations performed for the Type-B (Kutter et al 2015) predictions of the centrifuge model tests, and a critical comparison between simulation and experimental results. A sensitivity study was performed to identify which of the input parameters had the largest effect on the response.…”

Section: Introductionmentioning

confidence: 99%

Numerical Simulations of Selected LEAP Centrifuge Experiments with PM4Sand in FLAC

Montgomery

Ziotopoulou

2019

Model Tests and Numerical Simulations of Liquefaction and Lateral Spreading

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Increasing the confidence in estimates of liquefaction-induced deformations from numerical models requires careful validation of both constitutive models and numerical simulation approaches. This validation should be performed with proper consideration of the intended use of the simulation results and the uncertainty inherent in comparing numerical simulations to laboratory or physical models. This paper describes the comparison of a set of calibrated numerical simulations to the results of centrifuge experiments with a submerged, liquefiable slope. These simulations were performed as part of the 2017 LEAP simulation exercise using the constitutive model PM4Sand and the numerical platform FLAC. The simulation results were compared to those from the centrifuge to identify which aspects of the experimental response the simulations were adequately able to capture. This paper provides a description of the simulation approach including the constitutive model and numerical platform. The process of calibrating PM4Sand to the results of laboratory experiments is described. This is followed by a description of the system-level simulations and a comparison of the simulation results with the experimental results. A sensitivity study was performed to examine trends in the simulation response and a discussion of the findings from this study is presented.

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“…LEAP (Liquefaction Experiments and Analysis Projects) is an effort to facilitate validation and verification of numerical procedures for liquefaction-induced lateral spreading analysis of a liquefiable sloping ground (Kutter et al 2014(Kutter et al , 2015Manzari et al 2014). In order to obtain a set of reliable centrifuge test data with high quality among different centrifuge facilities, a centrifuge experiment was repeated at six centrifuge facilities in LEAP-GWU-2015 (Kutter et al 2017;Manzari et al 2018), as one project within LEAP.…”

Section: Introductionmentioning

confidence: 99%

Numerical Simulations of LEAP Dynamic Centrifuge Model Tests for Response of Liquefiable Sloping Ground

Qiu¹,

Elgamal²

2019

Model Tests and Numerical Simulations of Liquefaction and Lateral Spreading

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This paper presents numerical simulations (modified Type-B) related to LEAP-UCD-2017 (Liquefaction Experiments and Analysis Projects) dynamic centrifuge model tests for a liquefiable sloping ground conducted by various institutions. The numerical simulations are performed using a pressure-dependent constitutive model implemented with the characteristics of dilatancy and cyclic mobility. The soil parameters are determined based on a series of available stress-controlled cyclic triaxial tests during the Type-A simulation phase for matching the liquefaction strength curves of Ottawa F-65 sand. The computational framework for the dynamic response analysis is discussed. Computed results are presented for the selected centrifuge experiments (modified Type-B simulations). Measured time histories (e.g., displacement, acceleration and excess pore pressure) of these experiments are reasonably captured. Comparisons between the numerical simulations and measured results showed that the pressure-dependent constitutive model as well as the overall employed computational framework have the potential to predict the response of the liquefiable sloping ground, and subsequently realistically evaluate the performance of an equivalent soil system subjected to seismically induced liquefaction.

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Proposed outline for LEAP verification and validation processes

Cited by 16 publications

References 3 publications

Specifications and Results of Centrifuge Model Test at Zhejiang University for LEAP-UCD-2017

Specifications and Results of Centrifuge Model Test at Zhejiang University for LEAP-UCD-2017

Numerical Simulations of Selected LEAP Centrifuge Experiments with PM4Sand in FLAC

Numerical Simulations of LEAP Dynamic Centrifuge Model Tests for Response of Liquefiable Sloping Ground

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