伊通软土的次固结特性

为了合理计算软土地基的沉降量，对软土的次固结特性及影响因素进行研究。采用分级加荷的方法，对伊通软土进行了压缩固结试验。结果表明：伊通软土的应变速率和时间双对数曲线具有相关性；随着固结压力的增大，次固结系数C_a先迅速增大至最小值的3倍，达到峰值后逐步减小至峰值的15%，达到稳定；次固结系数C_a与压缩指数C_c具有一定的线性相关性，C_a/C_c值在0.030~0.043之间；次固结系数C_a随时间的增加呈对数下降趋势，随着时间的增长，C_a下降，最终其最小值达到最大值的72.3%。本文的研究结果可以对伊通地区软土地基的变形与沉降预测提供一定的参考。

Secondary Consolidation Characteristics of Yitong Soft Soil

In order to calculate settlement of soft ground reasonably,the paper focuses on the secondary consolidation characteristics and influencing factors of soft soil.In this study,a series of consolidation and compression tests were conducted on the Yitong soft soil.The characteristics of consolidation and secondary consolidation of Yitong soft soil were analyzed with a graded loading method.The research results showed that there is a good linear correlation existed between the strain rate and time in double logarithmic coordinates:With the increase of load p,the secondary consolidation coefficient Ca increased rapidly,and then decreased gradually to a stable value;There is a linear correlation between the secondary consolidation coefficient Ca and the compression index Cc,and Ca decreased logarithmically with time.The ratio of Ca/Cc is between 0.030 and 0.043.The minimum of Ca is about 72.3％ of the maximum.These data provide some references to deformation prediction of soft ground in Yitong area.