摘要：随着我国水利工程建设的飞速发展，形成了大量新河岸，新河岸土体极易被水流冲蚀流失，诱发地质灾害，对人民的生命财产安全造成严重威胁。本文通过ABAQUS分析水流冲蚀作用下粘性土河岸边坡稳定性随时间的变化规律，发现河岸边坡的稳定系数随着水流冲蚀时间而下降;随着冲蚀时间的推移，河岸边坡稳定系数下降明显加快。本文通过水流冲蚀作用下河岸边坡稳定性研究将对河岸边坡的防护与监测起到现实的指导意义。

Abstract： With the rapid development of the construction of water conservancy projects in China， a large number of new river banks have been formed. The new river bank soil is easily eroded by water flow， causing geological disasters and posing a serious threat to the safety of people's lives and property.  In this paper， the ABAQUS is used to analyze the change law of the stability of the river bank slope under the action of water erosion， and it is found that the stability coefficient of the river bank slope decreases with the current erosion time; as the erosion time passes， the decline in the stability coefficient of the river bank slope has accelerated significantly. In this paper， the study on the stability of river bank slopes under the action of water flow erosion will have a practical guiding significance for the protection and monitoring of river bank slopes.

關键词：粘性土;河岸边坡;水流冲蚀;稳定性

Key words： clay;river bank slope;erosion;stability

中图分类号：TV223                                      文献标识码：A                                  文章编号：1006-4311（2020）21-0238-03

1  研究背景

随着我国大型水利工程的建设，河岸侵蚀成为近几年的研究重点，尽管在这之前有不少学者[1-5]进行过探索，但河岸侵蚀的研究仍任重道远。洪水季节，高流速水流对河岸边坡冲蚀破坏严重，并带走大量土体，致使河岸边坡形态随时间发生变化，导致河岸边坡稳定性发生变化，准确分析洪水冲蚀作用下河岸边坡稳定性随时间的变化规律能预防洪水灾害的发生，保证人们的生命财产安全。

2  水流冲蚀作用下河岸边坡失稳机理

当水流流速大于土体的起动流速时，水流的切应力大于土体的起动切应力，土体表面迅速冲蚀破坏[6]，土粒微团离开土体骨架被水流带走，则河岸边坡在水流冲蚀作用下随时间变得陡峭，临空面增加，使局部区域土体稳定性极具下降，局部区域土体垮塌，从而改变整个边坡的受力状态，致使河岸边坡稳定性降低。……