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Modeling of the Tensile Strength of Unsaturated Granular Soil Using Soil-water Characteristic Curve
김태형,김찬기,김태훈,Kim Tae-Hyung,Kim Chan-Kee,Kim Tae-Hoon Korean Geotechnical Society 2004 한국지반공학회논문집 Vol.20 No.7
This study was conducted to explore the tensile strength models in granular soil at the full range of unsaturated state. Direct tension experiments were carried out with a newly developed direct tension technique. The measured experimental data were compared with theoretical models developed by Rumpf and Schubert for monosized ideal particulate solids at the unsaturated state. To do this, the soil-water characteristic curve obtained from a suction-saturation experiment was used to define the unsaturation state and the negative pore water pressure with different water content levels, which are important factors in theoretical tensile strength models. The nonlinear behavior of the tensile strength for unsaturated granular soil at the pendular state is appropriately simulated with Rumpf's model. For the funicular and capillary states, the predicted trend by Schubert's model is properly matched with the experimental data: tensile strength steadily increases and reaches a maximum value and then decreases until it reaches zero. This comparison supports the concept that the tensile strength of unsaturated real granular soil can be approximately simulated with theoretical models.
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김태형,김선환,김민준,최석원 한국물리학회 2013 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.62 No.4
An optimal optical configuration for producing symmetric left- and right-circularly-polarized light for a three-dimensional (3D) circularly-polarized active retarder (CP-AR) display is proposed. It consists of a λ/2 retardation switching liquid crystal (LC) cell and two positive A-plate films. When the vertical electric field that is applied to the λ/2 retardation-switching LC cell is alternately turned on and off, the overall AR panel produces left- and right-circularly-polarized light for the left and the right eyes, respectively. We designed an optical configuration and applied it to an electricallycontrolled birefringence (ECB) cell. From the results of calculation and experiments, we obtained a CP-AR display with highly reduced 3D crosstalk on the left- and the right-hand sides.
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