河流冲刷作用下堤岸稳定性研究进展

分析河流冲刷作用下堤岸土体起动时的受力特点和冲刷破坏机理,概括国内外近岸水流冲刷力的分布与计算、堤岸土体抗冲力确定、河岸土体横向冲刷计算方法等研究成果,分析和评价河流冲刷作用下堤岸边坡稳定性研究进展。指出进一步研究的问题和研究方法:必须将堤岸边坡稳定分析与河流冲刷作用同时考虑,建立包含河流冲刷力的堤岸稳定分析力学模型;开展堤岸稳定分析的三维数值模拟;利用有限元法预测堤岸边坡破坏发展过程,分析变形与稳定的内在联系;将水上岸坡、水下岸坡以及坡脚和河床作为一个整体,进行堤防稳定的渗流场与应力场耦合分析。

Research progress on stability analysis of embankment under effects of river scouring

The stress characteristics and failure mechanism of soil mass under the effects of river scouring are analyzed.Progress both at home and abroad in the calculation of scouring force and its distribution along the near shore,the calculation of anti-scouring force of the embankment,and the computation of transverse scouring force on the embankment are summarized.Research progress on the stability analysis of the embankment under the effects of river scouring is analyzed and assessed.The problems and methods of further research are pointed out.The stability analysis of the embankment and the scouring should be considered simultaneously.A mechanical model for embankment stability,which includes the scouring force of the river,should be established.A three-dimensional numerical simulation of embankment stability should be set up to understand the effect of erosion on the embankment profile shapes.The process of deformation and failure of the embankment is forecast with the finite element method(FEM),and the internal relations between deformation and stability are analyzed.Considering the bank slope above water,the bank slope underwater,the toe of the slope and the riverbed as a whole,analysis of coupled seepage and stress fields as they affect embankment stability is conducted.