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Showing 1 to 20 of 74 for “"direct shear"”.
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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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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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Insights into the edifice stability of oceanic volcanoes from direct shear experiments and numerical models
… of the rocks that built the volcanic edifice. Direct shear experiments were carried out on samples from two case-study volcanoes Anak Krakatau (Sunda Strait, Indonesia) and Kilauea volcano (Hawai’i, USA). The experimental results were used to inform finite-element models representing the …
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The Location of Maximum Stress in Bars With Fillets Under Combinations Ofbending and Direct Shear
Made available in DSpace on 2014-12-05T19:15:56Z (GMT). No. of bitstreams: 1 6100091.pdf: 2287562 bytes, checksum: 9c0b70aaf0157aadb419ddf8b0d3b27d (MD5) Previous issue date: 1960
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A novel direct shear apparatus to evaluate internal shear strength of geosynthetic clay liners for mining applications
… applications. In particular, the internal shear strength of GCLs is an important design consideration since GCLs often are installed on sloped surfaces that induced internal shear and normal stresses. The objective of this study was to develop a direct shear testing apparatus to measure the …
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A Comparative Study on Shear Strength Testing of Single and Multi-layer Interfaces using Large Direct Shear Apparatus
… interface testing to determine geosynthetic shear design characteristic values that are used in the design of structures such as landfill liners. A topic of discussion remains the preferred interface testing configuration and only a few studies have substantiated and quantified the …
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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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Laboratory Investigation of Shear Behaviour in Rock Joints Under Varying Boundary Conditions
… geotechnical design, is through laboratory direct shear testing. Direct shear testing is typically conducted using two different boundary conditions: constant normal stress (CNL*) and constant normal stiffness (CNS). The CNL* boundary condition represents fracture behaviour in slopes and …
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An Investigation of the Effects of Specimen Gripping Systems on Shear Stress at the Geosynthetic/Geosynthetic Interface in Landfill Applications
… materials becomes the critical section where shear failure is likely to occur. For this reason, their shear strength behaviour is determined in the laboratory at anticipated site conditions, mainly using a direct shear device to obtain design parameters. These laboratory tests are preferably …
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Drained shear strength of stiff clays for slope stability analyses
… of the drained residual and fully softened shear strengths of cohesive soils, the shear strength mobilized in field case histories involving previous and no previous sliding in stiff clays, and develop empirical relationships that describe the stress-dependent nature of the residual and …
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Failure Modes of Asperities in Rock Discontinuities
… failure in fracture process of asperities under direct shear loading. The result of this work can be combined with future research to develop a more meaningful relationship between the peak shear strength of the rock joints and the applied normal stress.
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Residual Strength of Franciscan-Derived Clay
… in slope instabilities.</p> <p>Three different shearing tests were performed to study the residual strength: direct shear reversal, ring shear, and large-scale direct shear reversal. Sampling soil from the slide took place twice: once in 2017 and once in 2019. A block of soil sampled in 2017 was …
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Effects of Freezing Temperature on Interface Shear Strength of Landfill Geosynthetic Liner
… few decades. The present work emphasizes the shear strength of geocomposite clay liner (GCL) and geomembrane interface in landfills. Using direct shear tests, shear stress was measured as a function of normal load to determine the values of interface frictional angle and adhesion of the …
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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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On the shear strength of polyurethane coated railroad ballast
… develop. As part of this thesis study research, direct shear testing was undertaken for two di erent railroad ballast aggregates, granite and limestone. Both aggregate materials satis ed the AREMA No. 24 railroad ballast gradation requirements. Although the unbound granite samples showed higher …
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Effect of grading and grain size on the friction characteristics of a sand/geotextile inteface
… reinforcements transfer a majority of the shear stress from the soil to the reinforcement and vice versa by friction. This interfacing ability manifested by the soil/geotextile frictional contact is very important in the performance of reinforced soil structures, and depends on the physical …
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Structural performance evaluation of the Postrite post-treatment corrosion inhibitor system
… dynamically for load/deflection analysis. The direct shear and tensile strengths of the overlays were tested and evaluated. Strain gages were used to aid in an overlay to substrate interaction evaluation. The Postrite post-treatment system was determined to have no detrimental effects on the …
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INVESTIGATING THE IMPACT OF ROCK BRIDGES ON THE MECHANICAL BEHAVIOR OF JOINTED ROCK MASS USING LATTICE SPRING-BASED SYNTHETIC ROCK MASS (LS-SRM) APPROACH
… Surface Methodology (RSM). The results of direct shear models reveal that the LS-SRM method effectively replicates the failure mechanisms and peak shear strength of pre-existing rough two flows rock-like specimens with coplanar and non-coplanar rock bridges. As the normal stress levels …
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Experimental studies of scale effects on shear strength, and deformation of rock joints
The effect of scale on shear strength is studied by performing direct shear tests on different sized samples of large joints. A rubber moulding system is used to obtain impressions of the roughness from a variety of natural joint surfaces. A brittle model material is developed and used to cast …
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A resistência residual de solos determinada através do ensaio de cisalhamento por torção
The ring shear equipment developed by Bromhead (1979) to measure the soil residual strength is used here. Initially a detailed literature review on the residual strength is presented. It follows a description of equipment and test procedures. For comparison purposes, results of the direct shear …
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