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Showing 1 to 20 of 25 for “"Confining Stress"”.
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The Impact of soil structure and confining stress on the permeability of clay soils in brine environments
… impacts of initial soil structure and vertical confining stress on the changes of permeability that occur in a clayey soil when it is exposed to brine. Different methods of sample preparation are included so that the effect of different soil structure can be observed. In addition the …
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Multiphase flow and fault poromechanics : understanding earthquake triggering and seismic hazard
… of individual fractures, we study the impact of confining stress on the capillary pressure behavior during drainage through rough fractures, where we find that capillary pressure variations are sensitive to the degree of confining stress and the degree of spatial correlation of the fracture …
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Effect of Confinement and Temperature on the Behavior of EPS Geofoam
… subjected to multi-axial loading. Effects of confining pressure on the stress-strain behavior of EPS geofoam have been investigated in previous studies. Some studies found increases in confining stress lead to corresponding decreases in both modulus and compressive strength. Increasing …
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Comparison and Correction of Multistage Triaxial Tests to Single Stage Triaxial Test for the Rock Mechanical Testing
… Single Stage Triaxial (SST) is where a constant confining stress is applied and the axial stress is raised until the sample fails. This is compared to the Multistage Triaxial (MST) test, where the sample is loaded to the point of positive dilatency (PPD) then unloaded to low deviatoric stress, …
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Putting Place Back Into Displacement: Reevaluating Diaspora In the Contemporary Literature of Migration
… the effects of curing time and vertical curing stress. It is shown that the introduction of cement into soft soils results in decreased compressibility and increased unconfined compressive strength when compared to unimproved soils. Also, the unconfined compressive strength of the cement-soil …
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Impact of Curing Time and Curing Stress On the Mechanical Behavior of Cement-Improved and Cement-Fiber-Improved Soft Soil
… the effects of curing time and vertical curing stress. It is shown that the introduction of cement into soft soils results in decreased compressibility and increased unconfined compressive strength when compared to unimproved soils. Also, the unconfined compressive strength of the cement-soil …
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DEM Study of a Single Stone Column in a Clayey Stratum
… angle of the granular material that include: confining stress, particle shape, relative density and particle distribution (gradation). These factors are not directly considered in the design of aggregate columns. However, because the granular material friction angle is a fundamental design …
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Energy-Based Evaluation and Remediation of Liquefiable Soils
… and normalized by the initial mean effective confining stress (i.e., normalized energy demand: NED) is calculated for 126 earthquake case histories for which the occurrence or non-occurrence of liquefaction is known. By plotting the computed NED values as a function of their corresponding SPT …
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The development of a periodic loading apparatus for triaxial testing
… It is possible to apply a periodic deviator stress as well as a periodic confining stress and to vary the pattern of stress applications quite readily. The same apparatus could be utilized to test soil samples under static triaxial loading conditions also.
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Resistência ao cisalhamento de solos compactados: uma proposta de tipificação
… of designed and/or constructed Brazilian dams. Stress-strain, pore-pression deformation, and efective stress path curves are analysed and as a result some typical soil behaviors were identified as a function of the plots. These behaviors are then associated with such factors as type of soil, …
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Track behaviour: the importance of the sleeper to ballast interface
… are<br/>used to describe the development of confining stress within the ballast during 100 cycles of<br/>vertical load. The development of confining stress is assessed with reference to a finite element<br/>model of the laboratory apparatus and it is shown that the earth pressure ratio moves …
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Soil-pipeline interaction in unsaturated soils
… conditions than in dry conditions at low confining stress levels mainly due to the suction-induced apparent cohesion generated by the fine particles present in the sand. In contrast, for coarser Cornell sand, the suction effect is found to be small even at low confining stress level, and …
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Poroelastic Calibration for Hydromechanically Coupled Numerical Discontinuum Models with Application in Low Permeability Hard Rock
… error less than 1% and an efficient transfer of stress through the sample. The proposed process for the poroelastic calibration of laboratory scale numerical samples involves the selection of the solid grain properties and the calibration of the drained response, undrained response and …
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Experimental characterization of the Barree and Conway (2004) single-phase non-Darcy flow model in various hydraulic fracturing sands
… laboratory flow experiments were conducted under confining stresses from 1000 psi to 5000 psi on five sizes and types of fracturing sand (resin coated and uncoated) and crushed turquoise. Three flow cells were built from each granular material. Each cell was designated for a single-phase flow. In …
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Experimental study of shear behaviour of high density polyethylene reinforced sand under triaxial compression
… Triaxial compression tests were performed using confining pressures of 50 kPa, 100 kPa, 200 kPa, 300 kPa and 400 kPa at a shear rate of 0.075 %/min, and to a maximum strain of 10 %. Laboratory results favourably suggest that there is an improvement in the soil shear strength properties due to …
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Effects of basecourse saturation on flexible pavement performance.
… moduli and Poisson’s ratio with deviator and confining stress for use in multi-layer elastic analyses. The results of a testing program where samples were subjected to stress states simulating traffic loading, indicated that saturation approximately doubles resilient deformations and increases …
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Comparison of shear strength properties of textured polyethylene geomembrane interfaces in landfill liner systems
… always give the best representation of the shear stress and normal stress relationship for sheared interfaces. These geomembrane shear strength envelopes could be described as linear until a critical confining stress in the range of 100 kPa to 150 kPa was attained, therefore making the failure …
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Assessment of Improvement in Unpaved Roadway Performance Using 3D Geogrids Under Cyclic Loading
… ranging from 41 kPa to 55 psi (6 psi to 8 psi of confining stress and deviatoric stress from 13.7 kPa to 124 kPa (2 psi to 18 psi). The used frequency of the load cycles was 1 Hz or one per 1 second, where the maximum applied stress occurred in the first 0.2 seconds of the loading cycle, while the …
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Stress- and direction-dependent analysis of elastic and petrophysical properties, and texture in unconventional rocks
… features is an essential mechanism affecting stress- and direction-dependency of elastic and fluid transport properties. Accurately measuring seismic anisotropy and its relationships with petrophysical properties while investigating rock fabric evolution using high-resolution textural images …
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The Connection Behavior of Precast Prestressed Piles to Cast-In-Place Bent Caps
… a unique connection detail between precast prestressed piles to cast in place bent caps. This detail is constructed by plainly embedding piles to a specified depth into bent caps. Typically in regions of high seismicity such as South Carolina connections between these two elements require …
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