压实膨胀土路基的膨胀变形规律研究

首先分析了现有规范中膨胀土膨胀量计算方法存在的缺陷,然后以宁淮高速公路淮安段膨胀土为研究对象,根据膨胀土的有荷膨胀率试验成果,分析探讨膨胀土有荷膨胀率与填土初始含水率、上覆荷载和压实度的关系,总结提出了在侧向约束条件下,压实膨胀土的有荷膨胀率与初始含水率、上覆荷载和压实度之间的关系式,并使用该公式得到的膨胀率计算了宁淮高速公路直接使用膨胀土作为路堤填料可能产生的膨胀变形量,分析了初始含水率不同对膨胀量的影响。

Research on deformation disciplines of compacted expansive soils

The limitations of expansion capacity calculating method in current existing standards are analyzed. Based on the testing results of load expansion ratio of expansive soils in Huai’an section of Ning-Huai expressway, the relationships between the load expansion ratio and initial moisture ratio, the upper load as well as degree of compaction are analyzed. The relationships between the load expansion ratio and the initial moisture ratio, the upper load and the degree of compaction of the compacted expansive soils are proposed, and have been used to calculate the possible expansive deformation if the embankment of Ning-Huai expressway is filled with the expansive soils directly. The influence of initial moisture ratio on expansion capacity is also analyzed.