路堤荷载作用下考虑土体固结系数变化的软基固结规律

Consolidation behavior of soft foundation under embankment loads by considering the change of consolidation coefficient

针对土体固结系数的变化进行了理论分析,并通过现场试验发现固结系数在土体固结过程中变化很大,使得某一时刻土体的实际沉降量远大于设计值。同时,取现场原状土进行室内试验,测定土体的固结系数,研究固结系数与固结应力的关系。结果表明,对于海域中的超软土,土体固结系数随固结应力的增加而增加,达到某一峰值后开始迅速减小,最终趋于稳定。

The theory analysis on the change of consolidation coefficient of soil was carried, and through the field test, we found that the value of consolidation coefficient changed largely, which led the actual settlement at one point is much large than the design value. Besides, the value of consolidation coefficient was got through the indoor experiment by using original soil, and the relationship between consolidation coefficient and consolidation stress was analyzed. The results show that, the consolidation coefficient of the soft soil in sea area increases in the beginning when the stress increases, then the consolidation coefficient comes to a peak value, after that, it decreases very quickly, and finally tends to a stable value.