软土次固结系数与压力的关系

通过正常固结软黏土室内分级加载次固结试验,得出了荷载对次固结特性有较明显影响,次固结系数与压力存在一定关系的结论.对于室内试验结果,采用修正的双曲线模型拟合了正常固结状态下土的次固结系数与压力之间的定量关系,从而提出了正常固结土次固结沉降量计算的一种修正方法,并以实际工程某一断面的次固结沉降计算为例,将该修正方法与其他几种计算方法进行了对比分析.结果表明,正常固结土次固结沉降计算须考虑压力对次固结沉降的影响.

Relationship between loads and secondary consolidation coefficients of soft clay soils

Laboratory secondary consolidation tests were performed on normally consolidated soft clay soils to study the relationship between consolidation loads and secondary consolidation characteristics of soils.It is shown that consolidation loads are of obvious influences on secondary consolidation characteristics.A modified hyperbolic model was used to simulate the quantitative relationship between the two factors in the normal consolidation state.Accordingly,a modified method was proposed to calculate the secondary consolidation settlement of normally consolidated soils.A case study was performed to calculate the secondary consolidation settlement of a highway embankment section in a practical project.The comparison of the modified method with other calculation methods shows that consolidation loads should be considered in secondary consolidation settlement calculation of normally consolidated soils.