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以大连海事大学附近黄浦路路基土为研究对象,通过SLB-1型三轴试验仪进行不同冻融次数的三轴压缩试验,研究冻融对土的特性的影响.在不同围压(0-800kPa)和不同冻融循环(0-20次)的组合条件下,获得含水率、主应力差-应变、强度参数的变化规律.试验结果表明:相同冻融次数时,剪切强度随围压增大而增大;相同围压下土的内摩擦角、黏聚力和剪切强度随冻融次数的增加呈现先减小后增大的趋势;含水率随冻融次数的增加先升高后降低.转折点对应冻融次数在7次左右.采用超固结效应机理对冻融过程特性变化进行分析.
Taking the subgrade soil of Huangpu Road near Dalian Maritime University as the research object, the triaxial compression tests with different numbers of freeze-thaw cycles were carried out by SLB-1 triaxial tester to study the influence of freeze-thaw on the characteristics of soil. 800kPa) and different freeze-thaw cycles (0-20 times), the variation law of moisture content, principal stress difference-strain and strength parameters were obtained.The results show that with the same number of freeze-thaw cycles, The internal friction angle, cohesion and shear strength of soil under the same confining pressure first decreased and then increased with the increase of the number of freeze-thaw cycles; the water content increased first with the increase of the number of freeze-thaw cycles And then decrease.The turning point corresponds to the number of freeze-thaw cycles is about 7. Using super-consolidation mechanism to analyze the characteristics of the freeze-thaw process changes.