Results 201 to 210 of about 1,259,198 (268)
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Results of true triaxial strength tests on rock salt
Engineering Fracture Mechanics, 1990Abstract Knowledge of the thermomechanical properties of rock salt is important for the dimensioning of a permanent repository for radioactive wastes in a salt dome and for the necessary safety analysis, as well as for the design of mines and caverns.
U Hunsche, H Albrecht
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Strain Localization Conditions Under True Triaxial Stress States
2011This work uses a bifurcation approach to develop theoretical predictions for deformation band formation for a suite of true triaxial tests on Castlegate sandstone. In particular, the influence of the intermediate principal stress on strain localization is examined.
Kathleen A. Issen +2 more
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Simulation of Pressuremeter Shearing Mode by True Triaxial Apparatus
Geotechnical Testing Journal, 2007Abstract Pressuremeters are commonly used for determining the modulus of soil in the field. The shearing plane of the pressuremeter differs from those in the conventional laboratory strength tests; therefore the moduli obtained from these tests may be different.
TH Seah, D Shrestha
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Petrophysical Studies of Sandstones under True-Triaxial Stress Conditions
63rd EAGE Conference & Exhibition, 2001Development of an innovative polyaxial (true-triaxial) stress loading system is described. The system was originally designed to determine ultrasonic velocities, fluid permeability and elastic properties on cubic rock specimens in which sets of orientated fractures and microcracks had been introduced.
M.S. King, X.D. Jing, J.R. Marsden
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Hydraulic fracturing stress measurement using a true triaxial apparatus
International Journal of Rock Mechanics and Mining Sciences & Geomechanics Abstracts, 1997Abstract Generally, from pressure-time curves obtained in underground hydralulic fracture tests one can determine the breakdown pressure Pc, the fracture reopening pressure Pr and the shut-in pressure Ps. These pressure values are then used for the calculation of the in situ stress state.
Sibai, M., Henry, J.P., Gros, J.C.
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Failure of Castlegate Sandstone Under True Triaxial Loading
2011A test series designed to investigate and quantify the effect of the intermediate principal stress on the failure of Castlegate sandstone was completed. Using parallelepiped specimens and a true triaxial testing system, constant mean stress tests were conducted. Stress states ranged from axisymmetric compression to axisymmetric extension.
Mathew D. Ingraham +2 more
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A Small True Triaxial Apparatus with Wave Velocity Measurement
Geotechnical Testing Journal, 2005Abstract This paper describes a new cubical, true triaxial apparatus recently developed at the University of Western Australia (UWA). The apparatus is a stand-alone unit of the rigid type, where three pairs of pistons can be pressurized to impose three independent, rectilinear stresses on a sample of 250 mm side length. The sample can be
MA Ismail, SS Sharma, M Fahey
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A True Triaxial Cell for Soil and Rock
1988The design and performance of a membrane-piston, high-pressure (σ2 − σ3 ≦ 300 MN/m2) cell are presented. This device is similar to the one used for standard triaxial tests differing only in the stresses, σ2 and σ3, which are independently applied through flexible polyvinyl chloride (PVC) fluid cushions on prismatic specimens.
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Reducing boundary effects during True Triaxial loading of rocks
Even though stresses in the crust are triaxial (𝜎1>𝜎2>𝜎3) the overwhelming majority of rock deformation experiments are conducted under axisymmetric (or conventional triaxial) loading (𝜎1>𝜎2=𝜎3).Ashley Stanton-Yonge +4 more
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