Liquefaction experiment and analysis projects (LEAP): Summary of observations from the planning phase

Manzari, Majid T.; Ghoraiby, Mohamed El; Kutter, Bruce L.; Zeghal, Mourad; Abdoun, Tarek; Arduino, Pedro; Armstrong, Richard J.; Beaty, Michael; Carey, Trevor J.; Chen, Yunmin; Ghofrani, Alborz; Gutiérrez, David; Goswami, N K; Haigh, Stuart; Hung, Wen Yi; Iai, Susumu; Kokkali, Panagiota; Lee, Chung Jung; Madabhushi, Spg; Mejia, Lelio H.; Sharp, M. Keith; Tobita, Tetsuo; Ueda, Kyohei; Zhou, Yan‐Guo; Ziotopoulou, Katerina

doi:10.1016/j.soildyn.2017.05.015

Cited by 64 publications

(13 citation statements)

References 40 publications

(19 reference statements)

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“…Acknowledgments The experimental work on LEAP-UCD-2017 was supported by different funds depending mainly on the location of the work. The work by the US PI's (Manzari et al 2017…”

mentioning

confidence: 99%

LEAP-UCD-2017 Comparison of Centrifuge Test Results

Kutter

Carey

Stone

et al. 2019

Model Tests and Numerical Simulations of Liquefaction and Lateral Spreading

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This paper compares experimental results from every facility for LEAP-UCD-2017. The specified experiment consisted of a submerged medium-dense clean sand with a 5-degree slope subjected to 1 Hz ramped sine wave base motion in a rigid container. The ground motions and soil density were intentionally varied from experiment to experiment in hopes of defining the slope of the relational trend between response (e.g., displacement, pore pressure), intensity of shaking, and density or relative density. This paper is also intended to serve as a useful starting point for overview of the experimental results and to help others find specific experiments if they want to select a subset for further analysis. The results of the experiments show significant differences between each other, but the responses show a significant correlation, R 2~0 .7-0.8, to the known variation of the input parameters.

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“…Acknowledgments The experimental work on LEAP-UCD-2017 was supported by different funds depending mainly on the location of the work. The work by the US PI's (Manzari et al 2017…”

mentioning

confidence: 99%

LEAP-UCD-2017 Comparison of Centrifuge Test Results

Kutter

Carey

Stone

et al. 2019

Model Tests and Numerical Simulations of Liquefaction and Lateral Spreading

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“…LEAP-2017 project is a sequel to the LEAP-2015 project (Kutter et al 2017;Manzari et al 2017;Zeghal et al 2017) that initiated an international collaboration for validation of constitutive and numerical modeling of soil liquefaction and its consequences using high-quality centrifuge tests. The goals of LEAP-2017 are to assess: (1) the repeatability and reproducibility of centrifuge tests, (2) the sensitivity of the experimental results to variation of testing parameters and conditions, and (3) the performance and validity of constitutive models and numerical modeling tools in predicting the observed response.…”

Section: Introductionmentioning

confidence: 99%

LEAP-2017: Comparison of the Type-B Numerical Simulations with Centrifuge Test Results

Manzari

Ghoraiby

Zeghal

et al. 2019

Model Tests and Numerical Simulations of Liquefaction and Lateral Spreading

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This paper presents comparisons of 11 sets of Type-B numerical simulations with the results of a selected set of centrifuge tests conducted in the LEAP-2017 project. Time histories of accelerations, excess pore water pressures, and lateral displacement of the ground surface are compared to the results of nine centrifuge tests. A number of numerical simulations showed trends similar to those observed in the experiments. While achieving a close match to all measured responses (accelerations, pore pressures, and displacements) is quite challenging, the numerical simulations show promising capabilities that can be further improved with the availability of additional high-quality experimental results.

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“…Vasko (2015) conducted a series of triaxial experiments for the planning phase of LEAP (PLEAP). The data was used in a prediction exercise of centrifuge experiments performed during that phase (Manzari et al 2017). In this database the cyclic triaxial tests were performed on a single soil density which is the test density.…”

Section: Introductionmentioning

confidence: 99%

Physical and Mechanical Properties of Ottawa F65 Sand

Ghoraiby

Park

Manzari

2019

Model Tests and Numerical Simulations of Liquefaction and Lateral Spreading

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This paper presents the results of soil characterization and element tests of Ottawa F65 sand. The data presented is intended to be used as calibration material for the prediction exercise conducted as part of the Liquefaction Experiments and Analysis Project (LEAP 2017). The databank generated includes soil specific gravity tests, particle size analysis, hydraulic conductivity tests, maximum and minimum void ratio tests, and cyclic triaxial stress-controlled tests. An effort was made to ensure the consistency and repeatability of the test results by reducing the sources of variability in the sample preparations and increasing the number of tests. The uniformity of the soil was evaluated by conducting tests on samples from five different batches. The results showed that the sand is uniform among the five batches. Due to significant variability in previously reported maximum and minimum void ratio results, the effects of the test operator were studied by comparing test results obtained from three different operators. For the triaxial tests, a constant height dry pluviation method was used for sample preparation. To eliminate the effect of the human error in maintaining a constant drop height and to ensure consistency of the sand fabric between different samples, a device was developed to facilitate the sample preparation. The cyclic triaxial experiments were performed using three different soil densities, and a liquefaction strength curve was obtained for each density based on a 2.5% single amplitude axial strain criteria. The developed databank in this study was made publicly available for the community through DesignSafe.

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Liquefaction experiment and analysis projects (LEAP): Summary of observations from the planning phase

Abstract: LEAP (Liquefaction Experiments and Analysis Projects) is an effort to formalize the process and provide data needed for validation of numerical models designed to predict liquefaction phenomena.

Cited by 64 publications

References 40 publications

LEAP-UCD-2017 Comparison of Centrifuge Test Results

LEAP-UCD-2017 Comparison of Centrifuge Test Results

LEAP-2017: Comparison of the Type-B Numerical Simulations with Centrifuge Test Results

Physical and Mechanical Properties of Ottawa F65 Sand

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