不同深度沼泽湿地软粘土压缩固结特性

Compression and Consolidation Characteristics of Marsh Soft Clay in Different Depths

正确评价软粘土的变形特征,准确计算软粘土地基的沉降量及沉降过程,主要取决于变形指标。变形指标的实测结果受取样深度、固结压力及固结时间等因素影响。因此,采用单向固结试验,设计多级荷载,增加每级荷载的加压时间,对不同深度沼泽湿地软粘土进行压缩固结特性的研究。根据试验研究成果:系统地总结了不同深度沼泽湿地软粘土变形量、孔隙比、压缩系数、压缩模量随固结压力的变化特征及其取样深度对上述压缩性指标的影响;给出了不同深度沼泽湿地软粘土s～t和e～lg t曲线变化特征;得出了不同深度沼泽湿地软粘土主固结系数和次固结系数随固结压力的变化规律。研究成果为今后沼泽湿地软粘土地基的设计提供参考依据。

To correctly evaluate the deformation of soft clay and exactly calculate the settlement values and settlement process of soft clay mainly depend on the deformation indexes.The measured deformation indexes are affected by sampling depth,consolidation pressure,consolidation time and other factors.The research of consolidation and compression characteristics of marsh soft clay in different depths were carried out by using one-way consolidation test,multi-level load and increasing the time for each load stage.Based on the test results,the deformation,void ratio,compressibility factor,compression modulus of marsh soft clay in different depths varying with consolidation pressure and the effect of sampling depth on these compressive indexes were systematically summarized.The characteristics of s-t and e-lgt curves of marsh soft clay in different depths were given.The change regularities of primary consolidation coefficient and secondary consolidation coefficient of marsh soft clay in different depths with consolidation pressure were obtained.The research results can provide a reference for soft marsh clay foundation designing.