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    • 10. 发明申请
    • EXPANDABLE JACKET AND ITS CALIBRATION DEVICE FOR TRIAXIAL TESTS ON SOILS
    • 可膨胀夹克及其标定装置在土壤三轴测试中的应用
    • WO2016149128A1
    • 2016-09-22
    • PCT/US2016/022136
    • 2016-03-11
    • GUPTA, Ramesh, Chandra
    • GUPTA, Ramesh, Chandra
    • E02D1/02E02D1/04G01N3/08G01N33/24
    • G01N33/24G01N3/08
    • During triaxial compression test, a soil specimen experiences reduction of its height with increase in its diameter. New cross-sectional area is calculated assuming uniform increase in diameter. This condition is seldom met in actual soil specimens, because specimen undergoes non-uniform increase in diameter and very often with localized bulging in specimen affecting the accuracy of calculation of deviator stress, shear strength and volume change characteristics. The expandable jacket included in this invention consists of circular segmental metal plates wrapped around the soil specimen and elastomeric rubber bands or rings around the segmental plates to permit uniform radial expansion and maintain uniform diameter of the specimen during the test and thereby providing accurate values of deviator stress, volume change characteristics and shear strength of soil specimen. The calibration device for calibration of expandable jacket shall provide the magnitude of correction to be made in deviator stress.
    • 在三轴压缩试验中,土壤样品随着其直径的增加而降低其高度。 假设直径均匀增加,计算新的横截面积。 这种情况在实际土壤试样中很少遇到,因为试样的直径不均匀增大,而且经常会出现局部的试样膨胀,影响偏应力,剪切强度和体积变化特性的计算精度。 包括在本发明中的可膨胀护套包括围绕土壤试样包裹的圆形金属片和围绕分隔片的弹性橡胶带或环,以允许均匀的径向膨胀并且在试验过程中保持试样的均匀直径,从而提供偏离器的准确值 应力,体积变化特征和土体试样的抗剪强度。 校准膨胀套的校准装置应提供偏应力校正量。