软弱地基不同置换深度及宽度对堤防应力变形及稳定性影响研究

软弱地基对堤防稳定性有很大影响。本文采用数值计算方法分析了不同置换深度、不同的坡脚外置换宽度对堤防应力变形及稳定性影响规律。结果表明，当软土厚度一定时，随着置换厚度增大，新填筑堤防地基表面沉降减小，安全系数有所增大；当置换厚度一定时，增大堤脚外地基置换宽度对加固区堤身及地基变形影响不大，但对稳定性影响较大；置换深度越小，堤脚外加固宽度就越大。其成果对软基置换设计具有一定指导意义。

The influence research of different replacement depth and width on the stress deformation and stability of the dyke under weak foundation

The soft foundation has a great influence on the stability of embankment.The law of influence of different replacement depth and toe external width on the deformation and stability of the dyke is researched by numerical analysis.The results show that new levee foundation ground surface settlement decreases and the safety factor increases with the increase of the thickness of the filling replacement.When the replacement thickness is certain,the influence is not obvious by increasing replacement width of dike toe external field,but there is a significant influence on the stability.The reinforced zone width of foundation should increase with replacement depth decrease.The results have certain significance to guide the design of soft base replacement.