scholarly journals Effect of Anisotropic Yielding on the Flow Liquefaction of Loose Sand

2002 ◽  
Vol 42 (3) ◽  
pp. 33-44 ◽  
Author(s):  
S.M. Reza Imam ◽  
Dave H. Chan ◽  
Peter K. Robertson ◽  
Norbert R. Morgenstern
Keyword(s):  
Loose Sand ◽  
Anisotropic Yielding ◽  
Flow Liquefaction

scholarly journals Flow liquefaction potential of loose sand: stress path envelope and energy–based evaluation

2020 ◽  
Author(s):  
Kun Pan ◽  
Zhongxuan Yang ◽  
Yuanqiang Cai
Keyword(s):  
Axial Strain ◽  
Stress Path ◽  
Dissipated Energy ◽  
Loose Sand ◽  
Liquefaction Potential ◽  
Cyclic Shear ◽  
Cyclic Resistance ◽  
Potential Applicability ◽  
Potential Evaluation ◽  
Flow Liquefaction

Flow liquefaction, which is characterized by sudden collapse following the unstable behavior of saturated loose sand, may lead to the most catastrophic consequence of all liquefaction–related phenomena. This note presents a systematic experimental investigation into the flow liquefaction potential of sand under various initial and cyclic shear conditions. The cyclic flow liquefaction responses are compared to the monotonic shear results under an identical initial testing condition. It is found that the effective stress path of a monotonic test appears to envelop that of its corresponding cyclic test. The energy–based liquefaction potential evaluation indicates that the accumulative dissipated energy is uniquely correlated not only with the pore pressure and axial strain induced in sand, but also with the degraded stiffness during cyclic loading. Furthermore, the energy capacity for triggering the flow liquefaction appears to be intimately related to the cyclic resistance of sand; this signifies the potential applicability of energy–based liquefaction potential evaluation using strength data available in conventional analysis.

scholarly journals Discussion: Non-uniqueness of flow liquefaction line for loose sand

Géotechnique ◽  
2004 ◽  
Vol 54 (1) ◽  
pp. 66-68 ◽  
Author(s):  
M. Jefferies ◽  
K. Been
Keyword(s):  
Loose Sand ◽  
Flow Liquefaction

scholarly journals Yielding and Flow Liquefaction of Loose Sand

2002 ◽  
Vol 42 (3) ◽  
pp. 19-31 ◽  
Author(s):  
S.M. Reza Imam ◽  
Norbert R. Morgenstern ◽  
Peter K. Robertson ◽  
Dave H. Chan
Keyword(s):  
Loose Sand ◽  
Flow Liquefaction

Effects of deviator strain histories on liquefaction of loose sand using DEM

2021 ◽  
Vol 136 ◽  
pp. 104213
Author(s):  
Minyi Zhu ◽  
Guobin Gong ◽  
Jun Xia ◽  
Lianfeng Liu ◽  
Stephen Wilkinson
Keyword(s):  
Loose Sand

Reliability analysis of static liquefaction of loose sand using the random finite element method

2015 ◽  
Vol 32 (7) ◽  
pp. 2100-2119 ◽  
Author(s):  
Ali Johari ◽  
Jaber Rezvani Pour ◽  
Akbar Javadi
Keyword(s):  
Finite Element ◽  
Pressure Ratio ◽  
Monotonic Loading ◽  
Unit Weight ◽  
Soil Parameters ◽  
Loose Sand ◽  
Element Analysis ◽  
Content Type ◽  
Static Liquefaction ◽  
Random Finite Element

Purpose – Liquefaction of soils is defined as significant reduction in shear strength and stiffness due to increase in pore water pressure. This phenomenon can occur in static (monotonic) or dynamic loading patterns. However, in each pattern, the inherent variability of the soil parameters indicates that this problem is of a probabilistic nature rather than being deterministic. The purpose of this paper is to present a method, based on random finite element method, for reliability assessment of static liquefaction of saturated loose sand under monotonic loading. Design/methodology/approach – The random finite element analysis is used for reliability assessment of static liquefaction of saturated loose sand under monotonic loading. The soil behavior is modeled by an elasto-plastic effective stress constitutive model. Independent soil parameters including saturated unit weight, peak friction angle and initial plastic shear modulus are selected as stochastic parameters which are modeled using a truncated normal probability density function (pdf). Findings – The probability of liquefaction is assessed by pdf of modified pore pressure ratio at each depth. For this purpose pore pressure ratio is modified for monotonic loading of soil. It is shown that the saturated unit weight is the most effective parameter, within the selected stochastic parameters, influencing the static soil liquefaction. Originality/value – This research focuses on the reliability analysis of static liquefaction potential of sandy soils. Three independent soil parameters including saturated unit weight, peak friction angle and initial plastic shear modulus are considered as stochastic input parameters. A computer model, coded in MATLAB, is developed for the random finite element analysis. For modeling of the soil behavior, a specific elasto-plastic effective stress constitutive model (UBCSAND) was used.

Bearing Capacity of Foundations with Inclusion of Dense Sand Layer over Loose Sand Strata

2017 ◽  
Vol 17 (10) ◽  
pp. 06017018 ◽  
Author(s):  
Vishwas N. Khatri ◽  
Jyant Kumar ◽  
Shamim Akhtar
Keyword(s):  
Bearing Capacity ◽  
Loose Sand ◽  
Sand Layer ◽  
Dense Sand

Flow liquefaction instability prediction using finite elements

2014 ◽  
Vol 10 (1) ◽  
pp. 83-100 ◽  
Author(s):  
Toktam Mohammadnejad ◽  
José E. Andrade
Keyword(s):  
Finite Elements ◽  
Flow Liquefaction
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