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采用GCTS双向动三轴测试系统,把膨润土作为试验的黏粒材料,通过饱和砂土的双向动三轴试验,以试样液化的耗损能量为指标,探究不同黏粒含量、干密度、围压及相位差对饱和砂土液化特性的影响。结果表明:随着黏粒含量的增加,砂土液化所需的耗损能量先减少后增加,呈抛物线型,这是因为黏粒含量较低时,黏粒在砂颗粒间起到润滑的作用,随着黏粒含量的增多,黏粒反而起到固定和镶嵌砂颗粒的作用;随着干密度和围压的增大,砂土液化所需的耗损能量不断增加;相位差为180°时更有利于饱和砂土的液化,而相位差的变化与砂土液化所需耗损能量之间的关系不明显。
Using GCTS two-way moving triaxial test system, the bentonite was taken as the tested clay material. Through the two-way dynamic triaxial test of saturated sands, the energy loss of the liquefied sample was used as an index to explore the effects of different clay content, dry density, confining pressure And phase difference on the liquefaction characteristics of saturated sand. The results show that with the increase of clay content, the energy loss required for sand liquefaction decreases first and then increases, showing a parabola type. This is because clay particles play a lubricating role between sand particles when the clay content is low, With the increase of clay content, clay particles play the role of fixing and inlaid sand particles instead. With the increase of dry density and confining pressure, the energy loss of sand required for liquefaction continues to increase. When the phase difference is 180 ° Is conducive to the liquefaction of saturated sand, and the relationship between the phase difference and the depletion energy required for sand liquefaction is not obvious.