1引言淮河入海水道南堤和北堤分别为Ⅰ级、Ⅱ级防洪堤,有几十公里要在淤泥质粘土上填筑。根据淤泥质软土的特点,施筑这段防洪堤有一定的难度,尤其要对完建期期间的安全稳定问题加以注重,关键是对填筑时的基础沉降进行观测,并加以控制。笔者通过对淤泥质软土地基沉降观测的成果 1 Introduction The embankments of the Huaihe River into the sea and the North Embankment are Grade I and II flood levees, respectively. There are dozens of kilometers to fill in muddy clay. According to the characteristics of silt soft soil, it is difficult to construct this flood embankment, especially for the safety and stability during the period of completion. The key is to observe and control the foundation settlement during filling. The author through the siltation of soft ground settlement results