Suction Controlled Triaxial Apparatus for Saturated-Unsaturated Soil Test

2013 ◽  
Author(s):  
Luky Handoko
Keyword(s):  
Unsaturated Soil ◽  
Soil Test ◽  
Triaxial Apparatus

Consolidation thermique par chaleur d'un sol non saturé

1991 ◽  
Vol 28 (1) ◽  
pp. 42-50 ◽  
Author(s):  
C. Saix
Keyword(s):  
Unsaturated Soil ◽  
Constitutive Law ◽  
Saturated Soils ◽  
Soil Consolidation ◽  
Thermal Compression ◽  
Triaxial Apparatus ◽  
Thermal Consolidation ◽  
Sol Non Saturé ◽  
Temperature Parameter ◽  
Definition Of

The thermal consolidation by heating of an unsaturated silty soil is studied by means of six tests performed in a thermal triaxial apparatus. The results show the importance of the temperature parameter and a clear similarity with the classical consolidation tests on saturated soils. A constitutive law is proposed for the thermal consolidation by heat that allows the definition of indices of thermal compression. This law is used to calculate the displacements in an unsaturated fill for heat storing. Key words: unsaturated soil, consolidation, heat, triaxial, modelling. [Translated by the Journal]

A New Suction-Controlled True Triaxial Apparatus for Unsaturated Soil Testing

2020 ◽  
Vol 44 (4) ◽  
pp. 20190015
Author(s):  
Fang Zheng ◽  
Shengjun Shao ◽  
Yongxin Wang ◽  
Shuai Shao
Keyword(s):  
Unsaturated Soil ◽  
Soil Testing ◽  
True Triaxial ◽  
Triaxial Apparatus ◽  
True Triaxial Apparatus

The Experimental Study of the Influence of the Matric Suction on the Unsaturated Soil Strength

2014 ◽  
Vol 580-583 ◽  
pp. 514-517 ◽  
Author(s):  
Cui Ran Liu
Keyword(s):  
Experimental Study ◽  
Shear Strength ◽  
Moisture Content ◽  
Unsaturated Soil ◽  
Matric Suction ◽  
Saturated Soil ◽  
Triaxial Apparatus ◽  
Soil Shear Strength ◽  
Soil Triaxial Apparatus ◽  
Water Contents

With modified unsaturated soil triaxial apparatus, unsaturated soil shear strength of the tests under the condition of different water contents are done. Experimental results show that the matric suction exist in unsaturated soil and increases with the decrease of moisture content. And the shear strength of unsaturated soil is higher than that of saturated soil. Shear strength of unsaturated soil varies as the matric suction and water content. The shear strength increases when the matric suction increases. when soil tend to be saturated, the matric suction will tend to be zero. And the shear strength of unsaturated soil values gradually close to the strength of the saturated soil.

The Experimental Study of Permeability Coefficient of Unsaturated Soil

2011 ◽  
Vol 71-78 ◽  
pp. 1158-1162
Author(s):  
Cui Ran Liu ◽  
Peng Li He ◽  
Huai Feng Tong
Keyword(s):  
Unsaturated Soil ◽  
Permeability Coefficient ◽  
Unsaturated Soils ◽  
Indirect Method ◽  
Direct Method ◽  
Silty Clay ◽  
Test Results ◽  
Triaxial Apparatus ◽  
Technical Requirements ◽  
Direct Measurements

Due to the complexity and variability of unsaturated soil, the permeability property of unsaturated soils is clearly different from that of saturated soil. And because the test equipment is more complex and technical requirements are higher and diachronic cycle is longer, the researches related are slow. Using the triaxial apparatus of unsaturated soil, the direct and indirect experiments to study the permeability coefficient of unsaturated silty clay are done. Test results show that the permeability coefficient of unsaturated soil can be done by the indirect method and direct method. Not only the direct measurements of the permeability coefficient of unsaturated soil are realized through this trial, but also the reliability of indirect method is proved.

Stress–strain behaviour of unsaturated soil in true triaxial tests

2002 ◽  
Vol 39 (3) ◽  
pp. 608-619 ◽  
Author(s):  
Hajime Matsuoka ◽  
De'an Sun ◽  
Akiteru Kogane ◽  
Nobuhiko Fukuzawa ◽  
Wataru Ichihara
Keyword(s):  
Unsaturated Soil ◽  
Failure Criterion ◽  
Pore Water Pressure ◽  
Water Pressure ◽  
Triaxial Tests ◽  
Principal Stresses ◽  
True Triaxial ◽  
Triaxial Apparatus ◽  
True Triaxial Apparatus ◽  
True Triaxial Tests

A suction-controlled true triaxial apparatus for unsaturated soil was developed from the existing true triaxial apparatus for sand by attaching a device to supply matric suction to specimens. Using the developed apparatus, true triaxial tests (σ1 [Formula: see text] σ2 [Formula: see text] σ3; where σ1, σ2, and σ3 are the three different principal stresses) on an unsaturated silty soil were carried out under constant suction using the negative pore-water pressure method (s = –uw > 0; ua = 0) for applying the matric suction, s (s = ua – uw; where ua is the pore-air pressure and uw is the pore-water pressure). It was found that the true triaxial test results under three different principal stresses are uniquely arranged on the "extended spatially mobilized plane (extended SMP)" for frictional and cohesive materials that is modified from the original SMP for frictional materials by introducing "a bonding stress, σ0 (= c·cotϕ, where c is cohesion and ϕ is the internal friction angle)." It was also found that the shear strengths of the unsaturated silty clay obtained by the true triaxial apparatus nearly agree with the extended SMP failure criterion (Î1Î2/Î3 = constant, where Î1, Î2, and Î3 are the first, second, and third invariants of the translated stress tensor). The measured stress-strain-strength behaviour of the unsaturated soil in three-dimensional (3D) stresses can be well simulated by an elastoplastic model with the transformed stress based on the extended SMP criterion and a special hardening parameter.Key words: failure criterion, shear strength, special shear test, suction, stress path, unsaturated soil.

scholarly journals Effect of compaction pressure on consolidation behaviour of unsaturated silty soil

2004 ◽  
Vol 41 (3) ◽  
pp. 540-550 ◽  
Author(s):  
A R Estabragh ◽  
A A Javadi ◽  
J C Boot
Keyword(s):  
Unsaturated Soil ◽  
Yield Curve ◽  
Compaction Pressure ◽  
Triaxial Tests ◽  
Silty Soil ◽  
Triaxial Apparatus ◽  
Soil Fabric ◽  
Isotropic Consolidation ◽  
The Difference ◽  
Soil Behaviour

The effect of compaction pressure on subsequent soil behaviour during isotropic consolidation has been investigated by conducting controlled-suction triaxial tests on samples of an unsaturated compacted silty soil. A comprehensive set of laboratory experiments was carried out in a double-walled triaxial apparatus on samples of unsaturated soil that were prepared using two different compaction pressures. The axis translation technique was used for creating the desired suctions in the samples. In the experiments, the soil samples were subjected to isotropic consolidation under constant suctions. The results show that different compaction pressures produce different fabrics in a soil and therefore affect the behaviour of the soil. The results also show that the value of yield stress and the location of the loading–collapse (LC) yield curve are functions of soil fabric. Furthermore, it is shown that the slopes of normal consolidation lines for densely and loosely compacted samples differ in unsaturated conditions but are the same in saturated soils. A comparison is made between the behaviour of the dense and loose samples, and the difference in the behaviour is explained.Key words: suction, unsaturated soil, compaction, consolidation, soil fabric.

scholarly journals Local measurements of axial and radial strains using magnetic encoders in triaxial apparatus

2019 ◽  
Vol 92 ◽  
pp. 02002
Author(s):  
Marcin Witowski
Keyword(s):  
Radial Direction ◽  
Measurement Techniques ◽  
Soil Test ◽  
Radial Deformation ◽  
Axial Deformation ◽  
Soil Stiffness ◽  
Small Strains ◽  
Triaxial Apparatus ◽  
Local Measurements ◽  
Stiffness Characteristics

The requirement for implementing local measurements at small strains is well known. Without this type of measurement, it is not possible to accurately identify the soil stiffness characteristics over the entire stiffness degradation curve. The paper presents the results of the use of new sensor based on miniature magnetic encoders for axial and radial deformation measurements in triaxial soil test. Presented results include two types of measurement techniques for radial direction and one for axial deformation.

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