Effect of Inherent Anisotropy on the Behavior of Fine-Grained Cohesive Soils

2018 ◽  
Vol 17 (6) ◽  
pp. 687-697 ◽  
Author(s):  
Chia Zarei ◽  
Hossein Soltani-Jigheh ◽  
Kazem Badv
Keyword(s):  
Cohesive Soils ◽  
Inherent Anisotropy ◽  
Fine Grained

Scour by jets in cohesionless and cohesive soils

2007 ◽  
Vol 34 (6) ◽  
pp. 744-751 ◽  
Author(s):  
Kerry A Mazurek ◽  
Tanvir Hossain
Keyword(s):  
Impinging Jets ◽  
Coarse Grained ◽  
Cohesive Soils ◽  
Wall Jets ◽  
Fine Grained ◽  
Water Jets ◽  
Turbulent Wall Jets ◽  
Turbulent Wall ◽  
Turbulent Water ◽  
Unified Method

A technique is developed in this paper to unify the methods of analyzing scour by turbulent water jets in cohesionless and cohesive soils. Data from previous studies using circular turbulent impinging jets and circular turbulent wall jets are used to compare the scour in low void ratio cohesive soils to that in uniform sands and gravels. Scour by these jets is related to the dimensionless excess stress on the soil bed. It is seen that this parameter will likely work well for developing a method to predict scour for circular wall jets that is applicable to both materials. However, a circular impinging jet appears to vary appreciably in its interaction with the bed between the two types of soil, which makes developing a unified method to predict scour by impinging jets more difficult. Key words: erosion, scour, water jets, cohesionless sediments, cohesive sediments, fine-grained soils, coarse-grained soils.

Experimental investigation and constitutive modeling of the behaviour of highly plastic Lower Rhine Clay under monotonic and cyclic loading

2020 ◽  
Author(s):  
Merita Tafili ◽  
Torsten Wichtmann ◽  
Theodoros Triantafyllidis
Keyword(s):  
Cyclic Loading ◽  
Large Strain ◽  
Constitutive Models ◽  
Rate Dependency ◽  
Final Phase ◽  
Inherent Anisotropy ◽  
Fine Grained ◽  
Cyclic Mobility ◽  
Isotropic Consolidation ◽  
Lower Rhine

A new experimental series on the highly plastic (I_P = 34 %) Lower Rhine Clay (LRC) is presented. The study comprises tests on normally as well as over consolidated samples under monotonic and cyclic loading. The loading velocity has been varied in order to evaluate the strain rate dependency of the LRC behaviour testifying i.a. the well-known reduction of undrained shear strength with decreasing displacement rate. Isotropic consolidation followed by a cyclic loading with constant deviatoric stress amplitude leads to a failure due to large strain amplitudes with eight-shaped effective stress paths in the final phase of the tests. The inherent anisotropy has been additionally evaluated using samples cut out in either the vertical or the horizontal direction. Furthermore, the behaviour of LRC is compared with the behaviour of low plastic Kaolin silt (I_P = 12:2 %). A new visco-hypoplastic-type constitutive model with a historiotropic yield surface has been used to simulate some of the experiments with cyclic loading. Even the eight-shaped stress loops at cyclic mobility are reproduced well with this model. The data of this paper can be also used by other researchers for the examination, calibration, improvement or development of constitutive models dedicated to fine-grained soils under monotonic and cyclic loading.

Evaluation of a Modified Soluble Sulfate Determination Method for Fine-Grained Cohesive Soils

2002 ◽  
Vol 25 (1) ◽  
pp. 85 ◽  
Author(s):  
L David Suits ◽  
TC Sheahan ◽  
AJ Puppala ◽  
C Viyanant ◽  
AP Kruzic ◽  
...  
Keyword(s):  
Cohesive Soils ◽  
Determination Method ◽  
Fine Grained ◽  
Soluble Sulfate ◽  
Sulfate Determination

Field Testing: The Standard Penetration Test

1986 ◽  
Vol 2 (1) ◽  
pp. 21-26 ◽  
Author(s):  
S. Thorburn
Keyword(s):  
Field Testing ◽  
Standard Penetration Test ◽  
Cohesive Soils ◽  
Test Results ◽  
Penetration Test ◽  
Test Procedures ◽  
Weak Rocks ◽  
Fine Grained ◽  
Introductory Lecture ◽  
Strength And Stiffness

AbstractThis introductory lecture discusses the international use of the standard penetration test (SPT) and presents the proposals for International Reference Test Procedures. The application of the SPT as a means of assessing the strength and stiffness of weak rocks is mentioned together with the reliance upon the test at the present time for estimating the liquefaction potential of saturated fine grained non-cohesive soils. The various aspects of the execution of the SPT are discussed which can provide variable and unrepresentative values of resistance (N values).The principle of measuring energy losses and making adjustments to the N values is introduced as a basis for ensuring comparability of test results.Reference is made to the general descriptions of the SPT given in BS 5930:1981 and to the lack of clear guidance in this British Standard.

Empirical modeling of the compaction curve of cohesive soils

2001 ◽  
Vol 38 (1) ◽  
pp. 29-45 ◽  
Author(s):  
I A Basheer
Keyword(s):  
Neural Networks ◽  
Empirical Modeling ◽  
Effective Control ◽  
Cohesive Soils ◽  
Statistical Regression ◽  
Fine Grained ◽  
Essential Components ◽  
Compaction Curve ◽  
Field Compaction ◽  
Compaction Energy

Compaction curves (or density–moisture relationships) of cohesive soils are essential components for establishing practical and reliable criteria for effective control of field compaction. In this paper, modules built from empirical models for simulating the compaction curves of cohesive soils based on easily measured basic soil properties and compaction energy were developed using both statistical regression and artificial neural networks (ANNs) techniques. A large number of compaction curves pertaining to a wide variety of fine-grained soils were collected and used in modeling. The developed modules were able to predict compaction curves of soils with good accuracy, with the ANN-based module outperforming the statistical-based analog. The compaction modules were utilized to inquire about the compactibility behavior of fine-grained soils in relation to their properties and the compaction energy used. Besides their use as independent compaction curve predictors, the compaction modules can be used as supplementary units in numerical models for solving geotechnical engineering problems and as tools useful in preliminary design phases and feasibility studies.Key words: cohesive soils, compaction curve, modeling, neural networks, regression.

scholarly journals Coupling X-ray computed tomography and freeze-coring for the analysis of fine-grained low-cohesive soils

Geoderma ◽  
2017 ◽  
Vol 308 ◽  
pp. 171-186 ◽  
Author(s):  
Adrien Liernur ◽  
Andreas Schomburg ◽  
Pascal Turberg ◽  
Claire Guenat ◽  
Renée-Claire Le Bayon ◽  
...  
Keyword(s):  
Computed Tomography ◽  
Cohesive Soils ◽  
X Ray ◽  
Fine Grained ◽  
Freeze Coring ◽  
X Ray Computed

scholarly journals Moisture Content Impact on Mechanical Properties of Selected Cohesive Soils from the Wielkopolskie Voivodeship Southern Part

2015 ◽  
Vol 37 (4) ◽  
pp. 37-46
Author(s):  
Piotr Pezowicz ◽  
Krystyna Choma-Moryl
Keyword(s):  
Mechanical Properties ◽  
Moisture Content ◽  
Clay Fraction ◽  
Cohesive Soil ◽  
Consistency Index ◽  
Cohesive Soils ◽  
Fine Grained ◽  
Shearing Resistance ◽  
Primary Consolidation ◽  
Secondary Compressibility

Abstract Results of investigations of shearing resistance and compressibility of fine-grained cohesive soil from the southern part of the wielkopolskie voivodeship in relation to the increasing moisture content are presented. The analysis of two series of samples, using soil paste for the consistency index of 0.9 and 0.4–0.3 was carried out. The results imply that the increasing moisture content causes a decrease in the angle of shearing resistance and cohesion and is also reflected in the higher compressibility of the soil. It was observed that regardless of the soil consistency, the angle of shearing resistance decreases and the cohesion value and the oedometric modulus of primary (consolidation) and secondary compressibility grows with the increase in the clay fraction.

scholarly journals SOIL STRENGTH CRITERION WITH ACCOUNT FOR SHEAR RESISTANCE CAUSED BY PARTICLE ENGAGEMENT

2019 ◽  
Vol 14 (1) ◽  
pp. 36-42
Author(s):  
A. Yu. MIRNYY
Keyword(s):  
Yield Criterion ◽  
Strength Criterion ◽  
Shear Resistance ◽  
Soil Test ◽  
Cohesive Soils ◽  
Fine Grained ◽  
Precise Calculation ◽  
Common Criteria ◽  
Geotechnical Design ◽  
New Criterion

Shear resistance of soil becomes vital in geotechnical design of dams and embankments, and also landslides stabilization. Historically, the Mohr-Coulomb yield criterion was used for such problems solving — it appears to be suitable for the most of fine-grained soils. But in case of gravel soils, it was noticed that they possess so-called "cohesion" although there is no physical mechanism of such behavior. This extra shear resistance of non-friction nature is caused by the particle engagement. The engagement phenomenon was usually studied by hydro engineers, but since deep excavations and heavy structures are becoming common in civil engineering, more precise calculation becomes critical. This issue is dealing with the new yield criterion for gravel soils development. The most common criteria for non-cohesive soils and the parameters they are based on are analyzed. The proposed yield criterion is based on invariant stress parameters and concerns friction, cohesion and engagement between particles. It also takes into account second principal stress by using a non-fixed sliding plane. The parameters of this criterion are physically justified and can be determined by a standard soil test. Although it still needs experimental validation, this new criterion appears to be prospective for the usage in numerical modeling, as it is universal and versatile.

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