scholarly journals A simple method to predict the consolidation yield stress of compacted soils considering suction effects in unsaturated soil media

2002 ◽  
Vol 5 ◽  
pp. 785-792 ◽  
Author(s):  
Katsuyuki KAWAI ◽  
Eunra KIM ◽  
Hiroyuki NAGARETA ◽  
Atsushi IIZUKA ◽  
Michinori HONDA
Keyword(s):  
Yield Stress ◽  
Unsaturated Soil ◽  
Simple Method ◽  
Compacted Soils ◽  
Soil Media

Soil Strength Reduction Method Induced by Variation of Water Content

2012 ◽  
Vol 170-173 ◽  
pp. 847-852
Author(s):  
Peng Ming Jiang ◽  
Zhong Lei Yan ◽  
Peng Li
Keyword(s):  
Slope Stability ◽  
Unsaturated Soil ◽  
Unsaturated Soils ◽  
Characteristic Curve ◽  
Strength Reduction ◽  
Actual State ◽  
Soil Slope ◽  
Simple Method ◽  
The Common ◽  
The Stability

As the complexity of unsaturated soil theory, and it must have a long test period when we study the unsaturated soils, so the conventional design analysis software does not provide such analysis, so we can imagine that such a slope stability analysis does not accurately reflect the actual state of the slope. Based on the known soil moisture content，this paper use the soil water characteristic curve and strength theory of unsaturated soil to calculate the strength reduction parameters of soil which can calculate the stability of the soil slope when using the common calculation method. It is noticeable that this method can be extended and applied if we establish regional databases for this simple method, and these databases can improve the accuracy of the calculation of slope stability.

The Shear and Elongational Flow of Polymer Melts Containing Anisometric Filler Particles; Part I

1984 ◽  
Vol 57 (3) ◽  
pp. 507-522 ◽  
Author(s):  
L. A. Utracki
Keyword(s):  
Yield Stress ◽  
Flow Instability ◽  
Extensional Flow ◽  
Plug Flow ◽  
Dynamic Test ◽  
Melt Processing ◽  
Solid Base ◽  
Transient Effects ◽  
High Concentration ◽  
Simple Method

Abstract There is a dichotomy in the information on flow of anisometric particles. Most of the fundamental studies only consider dilute suspensions in Newtonian liquids, although some authors venture into a semiconcentrated (two-body collision) region and others into pseudoplastic liquids. These publications provide a solid base for understanding the behavior of the high-concentration systems of industrial importance, but without the desirable quantification. The description of these systems is experimental or, at best, qualitative, via simplified constitutive models. At high concentration of anisometric particles, one must consider: yield stress, plug flow, shear segregation, and a change of relaxation spectrum. There is no simple method to correlate the steady-state and dynamic test data. The magnitude of the stress overshoot in transient tests increases with concentration and deformation rate. While the normal stress increases with concentration, the die swell decreases. The yield stress in elongation is larger than that in shear, and the maximum strain at break initially increases with addition of filler, goes through a maximum, and falls to very low values at high loading. The orientation of anisometric particles can be accomplished in converging and diverging, i.e., extensional flow. In a simple shear field, the effect depends on the rate, concentration, and matrix viscosity—in general, shearing causes disorientation of aligned particles. All these effects influence melt processing. For extrusion, the plug flow narrows the range of processing variables, increases the solid-conveying zone, and may lead to flow instability. In injection molding, gating, pattern of orientation (modulated by solidification), and the transient effects depend on the specificity of the rheological behavior of the filled pseudoplastic liquids.

A simple method to analyze infiltration into unsaturated soil slopes

2008 ◽  
Vol 35 (2) ◽  
pp. 223-230 ◽  
Author(s):  
Kenneth Gavin ◽  
Jianfeng Xue
Keyword(s):  
Unsaturated Soil ◽  
Simple Method ◽  
Soil Slopes

scholarly journals Yield stress, volume change, and shear strength behaviour of unsaturated soils: validation of the SFG model

2009 ◽  
Vol 46 (9) ◽  
pp. 1034-1045 ◽  
Author(s):  
Annan Zhou ◽  
Daichao Sheng
Keyword(s):  
Experimental Data ◽  
Shear Strength ◽  
Yield Stress ◽  
Volume Change ◽  
Unsaturated Soils ◽  
Strength Criterion ◽  
Single Equation ◽  
Compacted Soils ◽  
Shear Strength Criterion ◽  
Stress Changes

The model recently presented by Sheng, Fredlund, and Gens, known as the SFG model, provides a consistent explanation of yield stress, shear strength, and volume change behaviour of unsaturated soils as functions of suction. All these functions are based on one single equation that defines the volume change with suction and stress changes. This paper provides a systematic validation of the equation and the derived shear strength criterion against experimental data. The experimental data used include those for samples prepared from slurry soils and compacted soils. It is shown that (i) the method currently used to determine yield stresses of unsaturated soils is incorrect, (ii) volume change behaviour of unsaturated soils can be well predicted by the SFG model, and (iii) shear strength behaviour of unsaturated soils can be represented very well by the criterion in the SFG model.

scholarly journals Rheological Characterization of Yield-Stress Fluids with Brookfield Viscometer

2021 ◽  
Vol 31 (1) ◽  
pp. 1-9
Author(s):  
Andrei Potanin ◽  
Greggory Marron
Keyword(s):  
Yield Stress ◽  
Accurate Data ◽  
Viscosity Method ◽  
Rheological Characterization ◽  
Simple Method ◽  
Yield Stress Fluids ◽  
Apparent Shear Rate ◽  
Selection Of ◽  
Good Agreement

Abstract This paper analyzes various techniques to use viscometers equipped with vane spindles to characterize rheological properties of yield stress fluids. Specifically, application of Brookfield viscometers to this end is discussed. A wide selection of toothpastes and lotions were tested. It is shown that a simple method based on apparent shear rate and stress, commonly referred to as a representative viscosity method, works well for moderately non-Newtonian samples but may significantly underestimate viscosity for samples with a more pronounced yield stress behavior. To get more accurate data an integral equation relating torque to angular velocity needs to be solved which can be easily done numerically to get a good agreement between the data collected on an inexpensive viscometer and the data from high-end rheometers.

scholarly journals Ground-penetrating Radar Accurately Locates Tree Roots in Two Soil Media Under Pavement

2011 ◽  
Vol 37 (4) ◽  
pp. 160-166
Author(s):  
Nina Bassuk ◽  
Jason Grabosky ◽  
Anthony Mucciardi ◽  
Gary Raffel
Keyword(s):  
Ground Penetrating Radar ◽  
Acer Platanoides ◽  
Tree Roots ◽  
Mixed Effect ◽  
Compacted Soils ◽  
Mixed Effect Models ◽  
Native Soil ◽  
Soil Media ◽  
Ground Penetrating ◽  
Root Location

This study involved locating tree roots with a ground-penetrating radar (GPR) system and then examining excavated roots in the same soil volume to compare the accuracy of the GPR system with true root location. In 2003, Acer platanoides ‘Emerald Queen’ Norway maples were planted in trenches containing two compacted soils (native silt loam and CU-Structural Soil). The trenches were paved with 10 cm of concrete. In 2008, a GPR system consisting of a 900 MHz antenna mounted on a root-scanning cart was used to conduct linear scans on top of the concrete. Immediately after scanning, the concrete was removed for selected trees and whole root systems were excavated (as an entire system attached to the tree trunk) using an air excavation tool. Regression analysis using mixed effect models showed that the radar reliably predicted root presence in both the native and structural soils. The root count correlations were r2 = 0.76 and r2 = 0.81 for the native and structural soils, respectively. In the compacted native soil under concrete, the radar out-put overestimated the presence of roots at the minimum detection diameter but did provide a signal associated with root presence at this detection level. In the structural soil under concrete, the radar output reliably predicted roots with only slight overestimation. This study showed that GPR data reliably predicted the presence and locations of roots under the concrete pavement in two compacted soils.

Mechanical improvement and vertical yield stress prediction of clayey soils from eastern Canada treated with lime or cement

2001 ◽  
Vol 38 (3) ◽  
pp. 567-579 ◽  
Author(s):  
Hélène Tremblay ◽  
Serge Leroueil ◽  
Jacques Locat
Keyword(s):  
Water Content ◽  
Yield Stress ◽  
Void Ratio ◽  
Soil Stabilization ◽  
High Water ◽  
High Water Content ◽  
Clayey Soils ◽  
Eastern Canada ◽  
Simple Method ◽  
Initial Void Ratio

The method of soil stabilization is well known and has been used throughout the world for many decades to improve some soil properties. Although many researchers have studied the effect of adding a cementing agent to a soil, not many of these researchers have explored the effect of treatment on the resulting properties of high water content soils like dredged material. Also, there has been little work concerning the prediction of the mechanical changes to the soil. Therefore, this paper summarizes the results of a research project conducted to define the general mechanical behavior of high water content clayey soils from eastern Canada treated with lime or cement, in terms of compressibility. In the light of this research, the general compressibility behavior has been obtained, defined by relationships between initial void ratio, additive content, and vertical yield stress for a given inorganic or organic soil. These relationships have been normalized on the basis of the one-dimensional compression curve of the remolded and reconstituted untreated soil to give a simple method for predicting the vertical yield stress of a treated soil for any initial void ratio and its resistance to compression.Key words: stabilization, compressibility, yield stress, clayey soils, lime, cement.

scholarly journals Viscoelastic Property of Yield Stress Fluids under Wall-Slip and Simple Method of Wall-Slip Suppression

2020 ◽  
Vol 48 (4) ◽  
pp. 215-222
Author(s):  
Yasunori Sato ◽  
Masashi Koizumi ◽  
Yukinobu Sugihara ◽  
Tsutomu Takahashi
Keyword(s):  
Yield Stress ◽  
Viscoelastic Property ◽  
Wall Slip ◽  
Simple Method ◽  
Yield Stress Fluids

A simple method for evaluating sludge yield stress

2003 ◽  
Vol 7 (3) ◽  
pp. 655-659 ◽  
Author(s):  
L. Spinosa ◽  
V. Lotito
Keyword(s):  
Yield Stress ◽  
Simple Method
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