软黏土次固结系数影响因素试验研究

Influence Factors of Secondary Consolidation Coefficient on Soft Clay

为探究沿海地区深厚软黏土次固结沉降问题,对杨林船闸原状淤泥质土进行6组常规一维固结试验.得到孔隙比随时间变化曲线、孔隙比随固结压力变化曲线、次固结系数随固结压力变化曲线.结果表明:原状样的次固结系数随固结压力的增加先变大后变小,随着加荷比的变大而变大;预压处理可以有效地降低次固结系数,且当固结压力较小时预压对降低次固结系数的效果尤为明显.

This paper bases on a number of one-dimensional consolidation test of six original samples in Yanglin shiplock,and the settlement of deep soft ground in the coastal areas is investigated.The laws of void ratio with thetime and the consolidation pressure and the laws of secondary consolidation coefficient with consolidation pressure are described.The results show that the secondary consolidation coefficient of the original sample increases and then decreases with the increase of the consolidation pressure,and it becomes larger with the increase of the load ratios.Besides,we find the preloading can reduce the secondary consolidation coefficient effectively,and it is obvious that the preloading can reduce the secondary consolidation coefficient with a smaller consolidation pressure.