Discussion of "Effect of undrained creep on instability behaviour of loose sand"

2003 ◽  
Vol 40 (5) ◽  
pp. 1056-1057 ◽  
Author(s):  
A Eliadorani ◽  
Y P Vaid
Keyword(s):  
Loose Sand ◽  
Undrained Creep

Effect of undrained creep on instability behaviour of loose sand

2002 ◽  
Vol 39 (6) ◽  
pp. 1399-1405 ◽  
Author(s):  
W K Leong ◽  
J Chu
Keyword(s):  
Shear Strength ◽  
Stress State ◽  
Laboratory Test ◽  
Loose Sand ◽  
Undrained Conditions ◽  
Undrained Creep

Prefailure instability in the form of a runway deformation can occur for loose sand under undrained conditions. The effect of creep on the instability behaviour of loose sand is studied experimentally in this note. Previous studies have established that instability can only occur when the stress state is above the instability line. However, if creep is allowed to develop under undrained conditions, instability can still possibly occur even when the stress state at which creep develops is below the instability line. A boundary that specifies the condition in which instability may be induced by undrained creep is determined based on the experimental data.Key words: laboratory test, liquefaction, sands, shear strength.

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

scholarly journals Impact or push-off lameness presentation is not altered by the type of track surface where horses are trotted

2015 ◽  
Vol 67 (6) ◽  
pp. 1475-1482 ◽  
Author(s):  
M.S. Azevedo ◽  
F.D.D.L. Côrte ◽  
K.E. Brass ◽  
M. Gallio ◽  
S.L Dau ◽  
...  
Keyword(s):  
Inertial Sensors ◽  
Concrete Surface ◽  
Variation Coefficient ◽  
Soft Ground ◽  
Loose Sand ◽  
Significance Level ◽  
Tukey Test ◽  
Minimum Height ◽  
Track Surface ◽  
Vector Sum

This study aimed to evaluate the influence of the track surface on which horses are examined, regarding the phase of lameness presentation. Ten horses with lameness in at least one limb were evaluated with wireless inertial sensors on three track surfaces (concrete, loose sand and grass). Six crossover track sequences were established. The variables vector sum, maximum and minimum height of the head and pelvis, variation coefficient of the maximum and minimum height of the head and pelvis were analyzed using ANOVA, followed by Tukey test to compare means between track surface and sequence, at 5% significance level. The lameness phase (impact or pushoff) was analyzed considering the proportion of affected animals. There were no differences on vector sum, maximum and minimum height or variation coefficient of head and pelvis. Difference was observed on the number of strides registered on sand compared to grass and concrete (p <0.0001) for fore and hindlimbs. Impact lameness on forelimbs was presented by a larger number of animals on the concrete surface; pushoff lameness was more evident on the grass surface. In the hindlimbs, impact lameness was more evident on the grass surface, while pushoff lameness was in greater number of animals on concrete surfaces. The track sequence on which horses were trotted during evaluation does not seem to be a factor, but the number of lame horses and the phase of lameness manifestation can vary between track surfaces, as some horses showed impact lameness on soft ground and elevation lameness on hard ground.

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
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