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为了模拟实际场地中土体变形和强度特性,研究开发了揭示侧限条件下饱和砂土震动液化机理的试验方法。文中采用了动态真三轴试验系统,该设备采用刚性板加柔性面的混合边界加载装置,并应用先进的CATS试验控制系统。试验结果表明应用动态土工真三轴仪进行砂土液化实验是可行的,并初步分析了侧限条件下的液化机理,即土体将在轴向压力、侧压和孔隙水压力相等的条件下发生液化,表明振动荷载过程中的应力重分布对砂土液化强度和孔隙水压力发展等具有显著的影响。
In order to simulate the deformation and strength characteristics of soils in the actual field, a test method for revealing the liquefaction mechanism of saturated sand under confined conditions has been developed. The article uses a dynamic true triaxial test system, the device uses a rigid boundary plate flexible board loading device, and the application of advanced CATS test control system. The experimental results show that it is feasible to carry out sand-soil liquefaction experiment with dynamic geotechnical true triaxial apparatus. The liquefaction mechanism under confining conditions is preliminarily analyzed. That is, under the conditions of equal axial pressure, lateral pressure and pore-water pressure Liquefaction occurred, indicating that the stress redistribution during vibration loading has a significant effect on the liquefaction strength of sand and pore water pressure.