砂土EPS颗粒混合轻质土的最优击实含水率

The optimum moisture content of sand EPS beads mixed lightweight soil

为了明确击实含水率对砂土EPS颗粒混合轻质土的密度和强度的影响,采用2因素(水泥添加量和EPS颗粒置换率)5水平均匀试验设计确定了5个不同配比,利用密度试验和无侧限抗压强度试验进行了研究。为了确定砂土EPS颗粒混合轻质土的最优击实含水率,引入了基于比强的最优击实含水率确定方法,并采用二分法(初始击实含水率设为6.5%和13%)寻求了每个配比的最优击实含水率,基于物理分析和试验数据给出了最优击实含水率的计算式。研究发现:击实含水率的增加有利于提高击实效果,对水泥的胶结作用则是先提高后降低;基于比强的最优击实含水率确定方法是适宜的;最优击实含水率受到EPS颗粒置换率和水泥添加量的影响。

To investigate the effect of moisture content on the density and strength of sand EPS beads mixed lightweight soil, 5 mix proportions are defined based on uniform experimental design method considering the two factors, cement content and EPS beads content, at 5 design levels. Laboratory density tests and uniaxial compression tests are conducted on sand EPS beads mixed lightweight soil. To determine the optimum moisture content of sand EPS beads mixed lightweight soil, the specific strength is imported. The binary search method is used to determine the optimum moisture content of the 5 mix proportions. The results show that the increase of moisture content is beneficial to the effect compaction, and the specific strength method is satisfactory for the determination of the optimum moisture content. The optimum moisture content is affected by cement content and EPS beads content.