Computational model for cyclic mobility and associated shear deformation

被引:411
作者
Yang, ZH
Elgamal, A
Parra, E
机构
[1] Univ Calif San Diego, Dept Struct Engn, La Jolla, CA 92093 USA
[2] Intevep SA, PDVSA, Caracas 1070A, Venezuela
关键词
D O I
10.1061/(ASCE)1090-0241(2003)129:12(1119)
中图分类号
P5 [地质学];
学科分类号
0709 ; 081803 ;
摘要
In saturated clean medium-to-dense cohesionless soils, liquefaction-induced shear deformation is observed to accumulate in a cycle-by-cycle pattern (cyclic mobility). Much of the shear strain accumulation occurs rapidly during the transition from contraction to dilation (near the phase transformation surface) at a nearly constant low shear stress and effective confining pressure. Such a stress state is difficult to employ as a basis for predicting the associated magnitude of accumulated permanent shear strain. In this study, a more convenient approach is adopted in which the domain of large shear strain is directly defined by strain space parameters. The observed cyclic shear deformation is accounted for by enlargement and/or translation of this domain in deviatoric strain space. In this paper, the model formulation details involved are presented and discussed. A calibration phase is also described based on data from laboratory sample tests and dynamic centrifuge experiments (for Nevada sand at a relative density of about 40%).
引用
收藏
页码:1119 / 1127
页数:9
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