吹填场区软黏土地基的次固结特性研究

针对天津中心渔港吹填场区软黏土地基进行了一系列的固结压缩试验，获得应力、应变与时间的关系，对比分析了吹填土层和天然沉积土层的固结和次固结特性，为吹填场区软黏土地基变形模型建立及长期工后沉降预测提供理论依据。研究表明，吹填土和天然沉积土的应变速率与时间双对数曲线具有很好的线性相关性；处理后吹填土含水率和压缩性较低，天然沉积土含水率和压缩性高；随荷载P增大，吹填土的次固结系数Ca?变化不大，天然沉积土的次固结系数Ca先增大后减小，最终趋于稳定；次固结系数Ca与压缩指数Cc具有良好的线性相关性，其随时间的增加均呈对数下降趋势。

Secondary consolidation characteristics of soft clay foundation of dredger fill site

A series of one-dimensional consolidation tests is conducted on soft clay from dredger fill site of central fishing port area in Tianjin. The relationship among stress, strain and time is obtained; the characteristics of the consolidation and secondary consolidation of dredger fill and natural sedimentary soil are compared, providing theory evidence for the deformation model of soft clay foundation of dredger fill site and the prediction of long-term settlement after construction. It is shown that strain rate has a good linear correlation with double logarithm curve of time for both dredger fill and natural sedimentary soil. After processing, the water content and compressibility of dredger fill is low, while that of natural sedimentary soil remains high. With the increase of consolidation pressure, the coefficient of secondary consolidation of dredger fills changes a little. For natural sedimentary soil, the coefficient of secondary consolidation increases first and then decreases, levels out eventually. The coefficient of secondary consolidation still has a good linear correlation with compression index. It keeps a logarithmic downtrend with the increasing of time.