Alternative Title
Paper No. 3.24
Location
St. Louis, Missouri
Date
11 Mar 1998, 1:30 pm - 4:00 pm
Abstract
Recent records of seismic site response have documented a salient liquefaction-induced cyclic shear-deformation mechanism. During liquefaction, these ground acceleration records have suggested a possible strong influence of soil-skeleton dilation at large cyclic shear strain excursions. Such phases of dilation can result in significant regain in shear stiffness and strength, leading to: i) associated instances of pore-pressure reduction. ii) appearance of spikes in lateral acceleration records (as a direct consequence of the increased shear resistance), and iii) a strong restraining effect on the magnitude of cyclic and accumulated permanent shear strains. As presented in this study, these response effects are also thoroughly documented by a large body of experimental research (mainly employing clean sands and dean non-plastic silts), including centrifuge experiments, shake-table tests, and cyclic laboratory sample tests. A number of efforts to computationally simulate this aspect of soil behavior are presented. In addition, the framework for a newly developed computational model is discussed.
Department(s)
Civil, Architectural and Environmental Engineering
Meeting Name
4th Conference of the International Conference on Case Histories in Geotechnical Engineering
Publisher
University of Missouri--Rolla
Document Version
Final Version
Rights
© 1998 University of Missouri--Rolla, All rights reserved.
Creative Commons Licensing
This work is licensed under a Creative Commons Attribution-Noncommercial-No Derivative Works 4.0 License.
Document Type
Article - Conference proceedings
File Type
text
Language
English
Recommended Citation
Elgamal, Ahmed-W.; Dobry, Ricardo; Parra, Ender; and Yang, Zhaohui, "Soil Dilation and Shear Deformations During Liquefaction" (1998). International Conference on Case Histories in Geotechnical Engineering. 10.
https://scholarsmine.mst.edu/icchge/4icchge/4icchge-session03/10
Soil Dilation and Shear Deformations During Liquefaction
St. Louis, Missouri
Recent records of seismic site response have documented a salient liquefaction-induced cyclic shear-deformation mechanism. During liquefaction, these ground acceleration records have suggested a possible strong influence of soil-skeleton dilation at large cyclic shear strain excursions. Such phases of dilation can result in significant regain in shear stiffness and strength, leading to: i) associated instances of pore-pressure reduction. ii) appearance of spikes in lateral acceleration records (as a direct consequence of the increased shear resistance), and iii) a strong restraining effect on the magnitude of cyclic and accumulated permanent shear strains. As presented in this study, these response effects are also thoroughly documented by a large body of experimental research (mainly employing clean sands and dean non-plastic silts), including centrifuge experiments, shake-table tests, and cyclic laboratory sample tests. A number of efforts to computationally simulate this aspect of soil behavior are presented. In addition, the framework for a newly developed computational model is discussed.
