scholarly journals Revisiting Hardin’s parameters for the quantification of particle breakage – A statistical entropy approach

2021 ◽  
Vol 249 ◽  
pp. 07001
Author(s):  
James Leak ◽  
Daniel Barreto ◽  
Vasiliki Dimitriadi ◽  
Emoke Imre
Keyword(s):  
Stress Level ◽  
Single Point ◽  
Initial Density ◽  
Stress Path ◽  
Particle Breakage ◽  
Statistical Entropy ◽  
Limited Data ◽  
Additional Insight ◽  
Strain Behaviour ◽  
Cartesian Coordinate

It is well recognised that particle breakage in granular materials is affected by stress level, stress path, initial density, and particle size distribution (PSD), amongst others. Furthermore, it has been shown that breakage has a significant influence on the stress-strain behaviour of soils. This paper compares a commonly used breakage parameter with grading entropy coordinates. Such coordinates enable for the representation of any PSD as a single point in a Cartesian coordinate plane. Hence, the evolution of PSD changes may be easily tracked. This paper aims to demonstrate that grading entropy coordinates are as (or more) effective than other breakage parameters, whilst providing additional insight. On the basis of limited data it is shown that grading entropy coordinates are able to capture the dependence of breakage on stress level, stress path and initial PSD.

scholarly journals The influence of particle breakage on stress-dilatancy relationship for granular soils

2019 ◽  
Vol 92 ◽  
pp. 09004 ◽  
Author(s):  
Zenon Szypcio
Keyword(s):  
Internal Energy ◽  
Stress Level ◽  
Triaxial Compression ◽  
Volumetric Strain ◽  
Stress Path ◽  
State Theory ◽  
Particle Breakage ◽  
Compression Tests ◽  
Particle Crushing ◽  
Soil Gradation

The influence of particle breakage on soil behaviour is important from theoretical and practical perspectives. Particle breakage changes the internal energy in two ways. First, internal energy is consumed for particle crushing and second, the internal energy changes because of additional volumetric strain caused by particle crushing. These two effects may be quantified by use of Frictional State Theory. The analysed drained triaxial compression tests of Toyoura sand, gravel and Dog's Bay sand at different stress level and stress path revealed that the effect of particle breakage is a function of soil gradation, strength of soil grains, stress level and stress path.

Effects of Stress Path and Stress History on the Stiffness of Reconstituted London Clay

1986 ◽  
Vol 2 (1) ◽  
pp. 139-144 ◽  
Author(s):  
J. H. Atkinson ◽  
J. S. Evans ◽  
D. Richardson
Keyword(s):  
Stress Path ◽  
Triaxial Tests ◽  
Soil Parameters ◽  
Stress History ◽  
Strain Behaviour ◽  
Reconstituted Soil ◽  
Path Dependent ◽  
London Clay ◽  
Soil Behaviour

AbstractSoil behaviour is stress history dependent and stress path dependent and soil parameters, particularly those for stress-strain behaviour, measured in conventional triaxial tests may not represent the behaviour of soil in many civil engineering works.To obtain more realistic parameters it may be necessary to conduct laboratory tests which more closely represent in situ conditions before and during construction.The paper describes equipment developed at The City University to carry out stress path tests simply and economically. A series of CU triaxial tests and stress path tests on reconstituted soil illustrate the dependence of measured soil parameters on stress history and stress path.

Effects of Load Duration and Stress Level on Deformation and Particle Breakage of Carbonate Sands

2020 ◽  
Vol 20 (7) ◽  
pp. 06020014 ◽  
Author(s):  
Yang Xiao ◽  
Zhengxin Yuan ◽  
Chandrakant S. Desai ◽  
Musharraf Zaman ◽  
Qifeng Ma ◽  
...  
Keyword(s):  
Stress Level ◽  
Particle Breakage ◽  
Load Duration

Calibrating and Validating TRAF-NETSIM Model of Single-Point Urban Interchange

1997 ◽  
Vol 1591 (1) ◽  
pp. 38-44 ◽  
Author(s):  
Michael P. Dixon
Keyword(s):  
Confidence Intervals ◽  
Single Point ◽  
Field Observations ◽  
Traffic Operations ◽  
Additional Insight ◽  
Accurate Representation ◽  
Operational Conditions ◽  
Operational Characteristics ◽  
Measures Of Effectiveness ◽  
Insight Into

A model of a single-point urban interchange (SPUI) was calibrated and validated using the traffic simulation program (TRAF-NETSIM). The model was calibrated on the basis of field observations at several existing SPUIs, and the model was validated on the basis of measures of effectiveness at a prototype interchange. Statistical analyses of several parameters were performed to determine confidence intervals and decile distributions and to compare values and distributions with defaults provided in TRAF-NETSIM. Other parameters were verified by informal field observations at the prototype interchange. The validation of the model demonstrated that TRAF-NETSIM can adequately represent traffic operations at a SPUI. Observations regarding the SPUI will provide additional insight into SPUI traffic operational characteristics. The methodology used to calibrate and validate the model of the SPUI should also be applicable to other modeling applications, ensuring a realistic and accurate representation of traffic operational conditions in a transportation system.

Rockfill Particle Breakage Generated by Wetting Deformation under the Complex Stress Path

2020 ◽  
Vol 20 (10) ◽  
pp. 04020166
Author(s):  
Yufeng Jia ◽  
Bin Xu ◽  
Chandrakant S. Desai ◽  
Shichun Chi ◽  
Biao Xiang
Keyword(s):  
Stress Path ◽  
Complex Stress ◽  
Particle Breakage ◽  
Complex Stress Path ◽  
Wetting Deformation

Stress path effects on the strength behaviour of a layered soil

1980 ◽  
Vol 17 (4) ◽  
pp. 603-607 ◽  
Author(s):  
M. Krishna Murthy ◽  
T. S. Nagaraj ◽  
A. Sridharan
Keyword(s):  
Experimental Investigation ◽  
Effective Stress ◽  
Volume Change ◽  
Stress Path ◽  
Layered Soil ◽  
Shear Behaviour ◽  
Compression Tests ◽  
Stress Strain ◽  
Strain Behaviour ◽  
Stress Parameters

An experimental investigation dealing with the influence of stress path on the shear behaviour of a layered soil prepared in the laboratory is described. Specimens trimmed in vertical and horizontal directions have been sheared under three different stress paths in compression and extension tests. Either in compression or extension, the stress–strain behaviour of the specimens with both orientations was apparently the same, although the volume change behaviour was different. The effective stress parameters C′ and [Formula: see text]′ were found to be unique and independent of the stress path and two principal orientations. However, the values of [Formula: see text]′ in extension tests were 6–7° higher than those in compression tests.

scholarly journals Evaluation of the coefficient of earth pressure at rest (K0) of a saturated-unsaturated colluvium soil

2019 ◽  
Vol 92 ◽  
pp. 07006 ◽  
Author(s):  
Lorena Gomes Abrantes ◽  
Tácio Mauro Pereira de Campos
Keyword(s):  
Earth Pressure ◽  
Stress Path ◽  
Tropical Regions ◽  
Suction Control ◽  
Catholic University ◽  
Strain Behaviour ◽  
Constant Suction ◽  
Flexible Wall ◽  
Loading And Unloading

To predict the stress-strain behaviour of soils under loading it is relevant the knowledge of its natural stress state, expressed by the coefficient of earth pressure at rest (K0). There are correlations in theliterature for K0 determination that comes from researches developed considering sedimentary soils,typically from temperate or cold regions. In dealing with residual and colluvium soils, typical of tropical regions, it is not appropriate to use these correlations, since K0 is affected by factors such as degree of weathering, laterization processes and suction, among others that also affect saturated sedimentary soils. This work analysed samples of a colluvium soil from a natural slope at the Pontifical Catholic University of Rio de Janeiro. For the determination of the coefficient of earth pressure at rest of the unsaturated colluvium soil, a flexible wall equipment, with a system of suction control was used. The influence of the net stress level on the value of the coefficient of earth pressure at rest was investigated under a constant suction of 10 kPa, following a loading and unloading cycle of applied vertical stress. The coefficient of earth pressure at rest of the saturated colluvium (null suction) was also determined using a stress-path, Bishop and Wesley type, servo-controlled triaxial equipment. The obtained results are presented and discussed.

Stress Path Tests on 100 mm Diameter Samples

1986 ◽  
Vol 2 (1) ◽  
pp. 133-137
Author(s):  
J. H. Atkinson ◽  
D. B. Clinton
Keyword(s):  
Stress Path ◽  
Triaxial Tests ◽  
Test Results ◽  
Design Problems ◽  
Strain Behaviour ◽  
Engineering Design Problems ◽  
Geotechnical Design ◽  
Pore Pressure Response ◽  
The City ◽  
Test Stress

AbstractThe use of stress path tests is discussed in relation to geotechnical design, and a description is given of the triaxial test stress path apparatus developed at The City University.Test results are presented from a series of triaxial tests following stress paths commonly encountered in engineering design problems. These are compared with the results of conventional triaxial tests.The stress-strain behaviour and pore pressure response of soil are shown to be very much dependent on the stress path followed, and the advantages of using stress-controlled loading in triaxial tests is demonstrated.

scholarly journals Creep of calcareous sand in Tunisia: effect of particle breakage at low stress level

2020 ◽  
Vol 11 (1) ◽  
Author(s):  
Hyunwook Choo ◽  
Minhyuk Kwon ◽  
Lamia Touiti ◽  
Young-Hoon Jung
Keyword(s):  
Stress Level ◽  
Creep Deformation ◽  
High Stress ◽  
Particle Breakage ◽  
Time Dependent ◽  
Creep Tests ◽  
Calcareous Sand ◽  
Constant Rate ◽  
Sieve Analyses ◽  
High Stress Level

Abstract Aims/hypothesis One of the critical mechanisms determining creep in granular materials is the breakage of soil particles. This study aims at evaluating the time-dependent creep deformation of calcareous sand at low effective stress conditions. Methods K0 creep tests were performed for both calcareous and silica sands at low stresses of 65 and 120 kPa, and the results of creep tests were compared with the results of constant rate of strain (CRS) tests at high stress levels up to 12 MPa. For a quantitative evaluation of the effect of the particle breakage on the creep deformation of calcareous sand, the relative breakage ($$B_{r}$$ B r ) was determined based on the results of sieve analyses. Results The results demonstrate that Tunisia calcareous sand experiences significant particle breakage during creep and the consequent creep deformation at low stress level. The determined $$B_{r}$$ B r after creep at low stress level is comparable with that after the CRS test at high stress level. Conclusions High potential of particle breakage inherited by characteristic minerology of the calcareous Tunisia sand significantly influences the creep deformation at low stress level.

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