Drained angle of internal friction from direct shear and triaxial compression tests

2016 ◽  
Vol 10 (3) ◽  
pp. 283-287 ◽  
Author(s):  
K. Lini Dev ◽  
Rakesh J. Pillai ◽  
Retnamony G. Robinson
Keyword(s):  
Internal Friction ◽  
Triaxial Compression ◽  
Direct Shear ◽  
Compression Tests ◽  
Angle Of Internal Friction ◽  
Triaxial Compression Tests

INFLUENCE OF BALLAST GRAIN SHAPE ON ITS STRENGTH PROPERTIES

2017 ◽  
pp. 148-160
Author(s):  
Alexey Kolos ◽  
Pavel Chistyakov ◽  
Alexey Leus ◽  
Yevgeniy Shekhtman ◽  
Valeriy Shtykov
Keyword(s):  
Internal Friction ◽  
Grain Shape ◽  
Triaxial Compression ◽  
Practical Importance ◽  
Major Effect ◽  
Strength Properties ◽  
Compression Tests ◽  
Dynamic Impact ◽  
Angle Of Internal Friction ◽  
Different Shapes

Objective: To assess the influence of grain shape in railroad ballast, taking dynamic impact of moving trains, on its strength properties – unit bite and the angle of internal friction. Methods: Laboratory compression tests of 25–60 mm fracture ballast stone were carried out with different shapes of grains in a triaxial compression tool by the method of consolidated R-tests. Results: The values of ballast stone unit bite and the angle of internal friction with a different degree of grain rounding were obtained. Test findings demonstrate major effect of ballast stone grain shape on its unit bite, which reduced up to 60–70 % in certain trials depending on the degree of grain rounding. Practical importance: New results were obtained which make it possible to specify the amount of reclaimed ballast, returned to track after fine cleaning, depending on the degree of grain rounding.

Study of the Strength of Disintegrated Carbonaceous Mudstone Modified with Nano-Al2O3 and Cement

2020 ◽  
Vol 20 (8) ◽  
pp. 4839-4845 ◽  
Author(s):  
Hongyuan Fu ◽  
Jie Liu ◽  
Huanyi Zha
Keyword(s):  
Triaxial Compression ◽  
Pozzolanic Reaction ◽  
Hydration Reaction ◽  
Compression Tests ◽  
X Ray Diffraction ◽  
Microscopic Mechanism ◽  
Angle Of Internal Friction ◽  
Gel Effect ◽  
Triaxial Compression Tests ◽  
Cement Hydration Reaction

Embankments filled with disintegrated carbonaceous mudstone (DCM) are prone to uneven settlements because of water-softening property and secondary disintegration of carbonaceous mudstone. To address this problem, nano-Al2O3 and cement were proposed in this study to improve the strength of DCM. Many nano-Al2O3- and cement-modified DCM (NACDCM) specimens with various nano-Al2O3 contents were prepared. Unconfined compression tests and triaxial compression tests were performed to examine the strengths of NACDCM under different conditions. Moreover, X-ray diffraction (XRD) analyses and scanning electron microscopy (SEM) observations were performed to reveal the microscopic mechanism for modification of the NACDCM. Macroscopic results showed that the unconfined compressive strength of NACDCM reached maximum when the nano-Al2O3 content was 0.2%. The cohesion showed positive correlation with nano-Al2O3 content while the angle of internal friction presented negative correlation with nano-Al2O3 content. Moreover, microscopic results indicated that nano-Al2O3 and cement improved the strength of NACDCM, mainly through cement hydration reaction, pozzolanic reaction, ion exchange, gel effect and filling effect.

Strength Analysis of the Construction Generated Soil Serving as Filling Material for the Consolidation Piles

2012 ◽  
Vol 166-169 ◽  
pp. 1029-1032
Author(s):  
Lan Chen
Keyword(s):  
Internal Friction ◽  
Strength Property ◽  
Triaxial Compression ◽  
Friction Angle ◽  
Plasticity Index ◽  
Strength Analysis ◽  
Filling Material ◽  
Compression Tests ◽  
High Quality ◽  
Triaxial Compression Tests

In order to use the construction generated soil to replace high quality sand for consolidation pile filling partially. Soil specimens with different plasticity indexes were prepared. Undrained triaxial compression tests were carried out on the samples for studying the strength property. Experiments show that the prepared soil specimens are satisfied for the condition of internal friction angle bigger than 30° in term of plasticity index smaller than 30.

A Simple Unconsolidated Undrained Triaxial Compression Test Emulator

2015 ◽  
Vol 771 ◽  
pp. 104-107
Author(s):  
Riska Ekawita ◽  
Hasbullah Nawir ◽  
Suprijadi ◽  
Khairurrijal
Keyword(s):  
Triaxial Compression ◽  
Measurement Data ◽  
Radial Strain ◽  
Compression Tests ◽  
Viscous Effects ◽  
Axial Pressure ◽  
Strain Stress ◽  
The University ◽  
And Storage ◽  
Triaxial Compression Tests

An unconsolidated undrained (UU) test is one type of triaxial compression tests based on the nature of loading and drainage conditions. In order to imitate the UU triaxial compression tests, a UU triaxial emulator with a graphical user interface (GUI) was developed. It has 5 deformation sensors (4 radial deformations and one vertical deformation) and one axial pressure sensor. In addition, other inputs of the emulator are the cell pressure, the height of sample, and the diameter of sample, which are provided by the user. The emulator also facilitates the analysis and storage of measurement data. Deformation data fed to the emulator were obtained from real measurements [H. Nawir, Viscous effects on yielding characteristics of sand in triaxial compression, Dissertation, Civil Eng. Dept., The University of Tokyo, 2002]. Using the measurement data, the stress vs radial strain, stress vs vertical strain, and Mohr-Coulomb circle curves were obtained and displayed by the emulator.

Strength envelope of granular soil stabilized by multi-axial geogrid in large triaxial tests

2020 ◽  
Vol 57 (3) ◽  
pp. 448-452 ◽  
Author(s):  
A.S. Lees ◽  
J. Clausen
Keyword(s):  
Triaxial Compression ◽  
Triaxial Tests ◽  
Compression Tests ◽  
Failure Envelope ◽  
Element Analysis ◽  
Linear Elastic ◽  
Perfectly Plastic ◽  
Elastic Perfectly Plastic ◽  
Triaxial Compression Tests ◽  
Properties Of Soil

Conventional methods of characterizing the mechanical properties of soil and geogrid separately are not suited to multi-axial stabilizing geogrid that depends critically on the interaction between soil particles and geogrid. This has been overcome by testing the soil and geogrid product together as one composite material in large specimen triaxial compression tests and fitting a nonlinear failure envelope to the peak failure states. As such, the performance of stabilizing, multi-axial geogrid can be characterized in a measurable way. The failure envelope was adopted in a linear elastic – perfectly plastic constitutive model and implemented into finite element analysis, incorporating a linear variation of enhanced strength with distance from the geogrid plane. This was shown to produce reasonably accurate simulations of triaxial compression tests of both stabilized and nonstabilized specimens at all the confining stresses tested with one set of input parameters for the failure envelope and its variation with distance from the geogrid plane.

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