Numerical modelling of rammed aggregate piers (RAP) in liquefiable soil
Numerical modelling of rammed aggregate piers (RAP) in liquefiable soil
复制标题
液化土中夯实骨料桥墩 (RAP) 的数值模拟
DOI:
10.1016/j.soildyn.2021.107088
复制
发表时间:
2022
影响因子:
4
通讯作者:
Green, R.A.
中科院分区:
文献类型:
--
作者:
Thum, T.S.;Yerro, A.;Saade, A.;Ye, E.;Wissmann, K.J.;Green, R.A.
Liquefaction poses a significant risk to the built environment, and as a result, ground improvement (GI) techniques are commonly used to mitigate this risk. Liquefaction mitigation strategies continually evolve, and several relatively new techniques, such as Rammed Aggregate Piers® (RAP), have shown promise. While the densification mechanism associated with many of the GI techniques is generally well known, other mechanisms such as reinforcement, lateral stress increase, and improved drainage that are thought to enhance liquefaction mitigation are still not completely understood. Moreover, field performance data for these GI schemes during actual earthquakes is limited. To fill this gap and evaluate the performance of RAP, this study presents the first numerical model on a specific GI technique that uses detailed site characterization, large-scale field test data, and post-earthquake field performance observations to calibrate and qualitatively validate the model. The in-situ characterization and full-scale field test data collected from the Ground Improvement Programme (GIP) performed following the 2010–2011 Canterbury Earthquake Sequence (CES) in New Zealand are used in this study. A set of fully-coupled hydro-mechanical finite difference (FD) models are performed in natural and reinforced conditions. For the unimproved soil profile, the results predict shear strains and zones of high excess pore water pressures reasonably well. For the profile reinforced with RAP, the analyses indicate that the stiffness properties of the RAP have the greatest influence on the reduction of generated shear strains in the soil profile. Finally, the calibrated models are subjected to a set of ground motions with different intensities to assess the efficacy of the RAP under different loading conditions.
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DOI:
10.1061/(asce)gt.1943-5606.0002286
发表时间:
2020-08
影响因子:
3.9
作者:
R. A. Green;J. Bommer;P. Stafford;B. Maurer;P. Kruiver;B. Edwards;A. Rodriguez-Marek;G. D. De Lange;S. Oates;T. Storck;P. Omidi;S. Bourne;J. van Elk
通讯作者:
R. A. Green;J. Bommer;P. Stafford;B. Maurer;P. Kruiver;B. Edwards;A. Rodriguez-Marek;G. D. De Lange;S. Oates;T. Storck;P. Omidi;S. Bourne;J. van Elk
DOI:
10.1061/(asce)gt.1943-5606.0002350
发表时间:
2020
影响因子:
3.9
作者:
A. Rahmani;J. I. Baez
通讯作者:
J. I. Baez
DOI:
10.1061/40975(318)115
发表时间:
2008
期刊:
Geotechnical special publication
影响因子:
--
作者:
R. Green;C. Olgun;K. Wissmann
通讯作者:
K. Wissmann
影响因子:
5
作者:
A. Papadimitriou;A. Vytiniotis;G. Bouckovalas;G. Bakas
通讯作者:
G. Bakas
DOI:
10.1007/978-3-030-22818-7_24
发表时间:
2019
期刊:
Model Tests and Numerical Simulations of Liquefaction and Lateral Spreading
影响因子:
--
作者:
J. Montgomery;K. Ziotopoulou
通讯作者:
K. Ziotopoulou