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Comparison of True Triaxial and Hollow Cylinder Tests on Cross-Anisotropic Sand Specimens

机译:各向异性各向异性砂岩试样的真三轴和空心圆柱试验比较

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摘要

Experiments have been performed in true triaxial equipment and in hollow cylinder equipment on dense Fine Nevada sand to study and compare the influence of the intermediate principal stress on the behavior observed in the two types of apparatuses. By suitable application of outside and inside pressures in hollow cylinder tests performed on cross-anisotropic sand deposits with horizontal bedding planes (without application of shear stresses), generated stress states are comparable with those applied in true triaxial tests on oriented specimens in Sector Ⅰ and Ⅲ of the octahedral plane. Stress non-uniformities occur in the hollow cylinder specimens and they may affect the results of these tests. The experiments showed good comparison in Sector Ⅰ, but those in Sector Ⅲ were not comparable because the hollow cylinder tests showed effects of buckling instability, failure in the σ_2-direction, and effects of stiff versus flexible boundaries through which the pressures were applied.
机译:在真三轴设备和中空圆柱设备上的密内华达细砂上进行了实验,以研究和比较中间主应力对在两种类型的设备中观察到的行为的影响。通过在空心垫层上对水平方向的横各向异性砂岩沉积进行适当的外部和内部压力试验(不施加剪切应力),所产生的应力状态可与真正的三轴试验在Ⅰ区和取向区的定向试样中得到的相媲美。八面体平面Ⅲ。空心圆柱试样中会出现应力不均匀现象,它们可能会影响这些测试的结果。实验在Ⅰ区进行了比较,但在Ⅲ区则没有可比性,因为空心圆柱体试验显示了屈曲不稳定性,σ_2方向的破坏以及施加压力的刚性与柔性边界的影响。

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