吹填淤泥次固结特性试验研究

Test Study on Secondary Consolidation Characteristics of Filled Hydraulic Mud

通过室内试验对吹填淤泥次固结系数随固结压力及固结历时的变化规律、次固结系数与压缩指数的关系进行了总结分析。结果表明:①次固结系数在工程预压荷载75～125kPa内随固结压力的增加变化最显著;②在两相邻试验时段内次固结系数减小25.7%～27.0%,受固结历时的影响十分明显;③次固结系数与压缩指数之比Ca/Cc=0.025 5～0.026 9,为沿海地区软土Ca/Cc的上限值,受压缩指数变化的影响最显著。在此基础上提出了考虑压力影响的吹填淤泥次固结变形计算方法。

Based on laboratory test, variation of coefficient of secondary consolidation of filled hydraulic mud with consolidation load and consolidation time, the relationship between coefficient of secondary consolidation and compression index are concluded and analyzed. The results show that： （1）coefficient of secondary consolidation is of the most significant variation with the pre-loading between 75kPa and 125kPa; （2）coefficient of secondary consolidation is reduced by 25.7% -27.0% , and it is reflected the significant influence of consolidation time; （3）the ratio of coefficient of secondary consolidation and compression index Ca/Cc is 0. 025 5 - 0. 026 9, which is the upper bound value among soft clay of coastal areas in China, and it is showed the most significant variation with compression index. Based on the results, the computation method for deformation of the secondary consolidation of filled hydraulic mud reflecting the influence of consolidation pressure is developed.