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按照公路路基填筑要求,对低液限粉土进行试验设计,通过分别控制压实度和初始含水量,对低液限粉土进行室内竖管毛细水上升高度试验,定性地分析了毛细水上升影响因素;重点分析了低液限粉性土毛细水上升高度随初始含水量及其压实度变化的特性,提出毛细水上升随时间分为3个阶段。当初始含水量大于9%时毛细水上升高度随初始含水量的增加而减小。在最佳含水量状态下随压实度的增加毛细水上升高度呈二次抛物线分布,强调了低液限粉性土作为路基填料时压实度应控制在90%以上,尽可能增加压实含水量,一般宜大于最佳含水量。
According to the requirements of highway subgrade filling, the experimental design of low liquid limit silt was carried out. By controlling the compaction degree and the initial water content separately, the capillary height rise of indoor vertical pipe was measured on low liquid limit silt. The capillary water And the influencing factors were analyzed. The characteristics of capillary water rise with the initial water content and compaction degree were analyzed emphatically. It was proposed that the capillary water rise with time is divided into three stages. When the initial water content is more than 9%, the capillary water rise height decreases with the increase of initial water content. Under the optimal water content, the compaction degree of capillary water shows a quadratic parabola distribution with the increase of compaction degree, which emphasizes that the compaction degree of low-liquid limit silt soil should be controlled above 90% Water content, the general should be greater than the best moisture content.