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Showing 1 to 15 of 15 for “"Direct shear test"”.
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Direct shear and direct simple shear tests: a comparative study of the strength parameters and their dependence on moisture and fines contents
Shear strength of soil is characterized by cohesion, angle of internal friction and dilatation. The first two parameters mentioned primarily define the soil's ability to resist shear stress underspecified load. These parameters can be determined by tests conducted either in the laboratory or the …
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Comparison of direct shear and triaxial tests for measurement of shear strength of sand
To ascertain the shear strength parameters of soils for engineering purposes is fundamental to soil mechanics and basic for designing earth-bearing and earth-retaining structures. Direct shear and triaxial tests are the most popular laboratory methods to determine these parameters. The direct shear …
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Three Dimensional Numerical Modeling of Excavation in Rock With Dilatant Joints
… is modeled using the plastic work done in shear. A dimensionless product of plastic work, rock strength, and wavelength of irregularities has been developed which fits the direct shear test results. An approach to scaling shear strength and shear displacement from laboratory to in the field …
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Enhancement of Shaft Capacity of Cast-in-Place Piles Using a Hook System
… of passive inclusion on pile-soil interface shear strength behaviour, employing a modified direct shear test apparatus. The interface strength obtained for pile-soil specimens was found to significantly increase when passive inclusions were implemented. Residual friction angle for …
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Shear strength behaviour of sugarcane bagasse reinforced soils
… reinforcement material. Because of this, a direct shear test was therefore initiated to establish the usefulness of using sugarcane bagasse as a soil reinforcement material by comparing the extent of shear strength and stiffness response due to its inclusion to unreinforced soil. Three …
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Quantifying Workability, Compactability, and Cohesion Gain of Asphalt Emulsion Cold In-Place Recycling
… properties. Chapter 4 evaluates different test methods and equipment commonly available in asphalt laboratories for ability to quantify workability, compactability, and cohesion gain of asphalt emulsion CIR by measuring differences in performance due to changes in laboratory curing …
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Evaluation of concrete bridge deck overlays
… and substrate age using a recently developed direct shear test apparatus.;Results show that except for bonding slurry, all the parameters had strong influence on shear bond strength. The results of this study will serve the purpose of screening and selection of overlays from a large number of …
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Terramechanical analysis of rover wheel mobility over simulated Martian terrain at various slip conditions and vertical loads
… Martian terrain. However, experimental testing must be done in order to validate this theoretical model. A test rig was developed by MIT's Robotic Mobility Group to measure the forces and torques on a single rover wheel as it traverses across a soil simulant of the Martian surface, and …
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An Examination of the Validity of Steady State Shear Strength Determination Using Isotropically Consolidated Undrained Triaxial Tests
The assessment of the shear strength of soil deposits after the occurrence of large strains is an important issue for geotechnical engineers. One method for doing so, the steady state approach, is based on the assumption that the steady state undrained shear strength is a unique function of the in …
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Development of ice-bonded ballast in sub-freezing temperatures and its effect on maintenance operations during a winter rail break
… study quantified the effect of frozen ballast on shear strength, f0, and rail gap size using laboratory experimental data and Illi3D, a field-validated finite element model (FEM). The laboratory data were transformed into f0 using a novel method developed in this study and then incorporated into …
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Enhanced Laboratory Testing and Characterization Related to the Mechanics of Anisotropic Rock
… at greater depths, it is important to use testing methods measuring geomechanical properties with a high degree of accuracy and repeatability. Tensile strength is commonly measured via the indirect tensile strength test, intact elastic components and compressive strength are measured via …
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Engineering Performance of Polymer Amended Soils
<p>A laboratory test program was undertaken to evaluate a series of engineering properties over a range of soil types; amendment types and addition rates; and moisture contents to enhance understanding of the engineering significance of polymer amendment. Four soils were manufactured and tested …
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Investigating the Evolution of Rock Discontinuity Asperity Degradation and Void Space Morphology under Direct Shear
… behaviour of the overall rock mass. While the shearing of rock mass discontinuities has been extensively studied in the past, there remains uncertainty surrounding the mechanisms by which surface asperities deform and degrade during shear and how this degradation influences the aperture …
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Improving Erosion Resistance and Revegetation of Wildfire-Altered Soils Using Microbial Induced Calcite Precipitation
… the efficacy of the treatment was measured by testing the treated samples for their shear strength, erodibility resistance and plants capacity to support vegetation. Soil samples were collected and burned to simulate wildfire conditions. The soil was mainly sandy, with a small percentage of …
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Effects of Reservoir Releases on Slope Stability and Bank Erosion
… was estimated using both laboratory and in situ tests. Due to the wide range of experimentally obtained values, the values determined by each of the methods was used for transient seepage modeling and the modeling results compared to the actual ground water table measured in the field. The …