河堤内非稳定渗流的实测与分析

在长期洪水渗透的作用下，堤防内的浸润线上升并到达背水坡脚，这会引起堤防内的孔隙水压力上升和非饱和状态土的强度下降，经常由此而导致堤防发生塌陷和滑动破坏。本文通过原尺寸堤防的洪水渗透试验对堤防内洪水渗透的过程和特征进行了观测，并通过对大型河堤长期洪水渗透试验的饱和-非饱和渗流的有限元解析，研究了洪水渗透的过程和特征，分析了各种条件对河堤内渗流的影响。

Observation and analysis of unsteady seepage flow in river embankment

Under the long-term action of flood,the phreatic line rises and reaches the toe of the landslide slope.This results in an increase of pore pressure and a decrease in strength of unsaturated soil.Consequently,a slide or collapse of river embankmant occurs.In this paper,the process of infiltration in a prototype river embankment and its flow characteristics are observed and analyzed by FEM.