深圳湾海相淤泥的压缩特性研究

海相淤泥压缩特性的研究对于其地基处理沉降准确预估具有重要的实践意义。通过对深圳湾吹填淤泥与海相原状淤泥压缩曲线特征分析,对其压缩特性进行了对比研究,结果表明:1)吹填淤泥的e-P曲线不同于海相原状淤泥,压缩过程分为扰动压缩、弹性压缩、塑性压缩三个阶段,第一阶段压缩系数比海相原状淤泥大一倍以上;2)吹填淤泥的e-lgP曲线转折点对应的固结压力为结构强度,将曲线分为两近似直线;3)由吹填淤泥压缩曲线特征得到的地基沉降简化计算方法,无需事先确定先期固结压力,使用方便且简洁。

Study on Compression Characteristics of Marine silt in Shenzhen Bay

The study on compression characteristics of marine silt has some important practical significance for accurate prediction on foundation settlement. Some characteristics of compression curves for dredged fill and undisturbed marine silt is analyzed in Shenzhen Bay, and comparative study on compression characteristics is also completed. The results are as followed: 1)the e-P curves of dredged fill is different from undisturbed marine silt, and the compression process is divided into three stages, including disturbance compression, elastic compression and plastic compression, and compression coefficient of dredged fill is two times larger than undisturbed marine silt in the first stage; 2)The consolidation pressure corresponding to a turning point of e-logP curve for dredged fill is its structural strength, the curve is divided into two approximately straight line by the turning point; 3)The simplified calculation method of foundation settlement is proposed according to some characteristics of compression curve for dredged fill, which is not determined for pre-consolidation pressure, and is used simply and easily.