水位降落时河岸边坡稳定性影响因素分析

Analysis on Influencing Factors for Bank Slope Stability at Drawdown of Water Level

维持河岸边坡稳定性是河流治理中的重要任务。从河流治理实践来看,影响边坡稳定性的因素多种多样,而且这些因素相互之间存在复杂的内部关系。本文对水位降落时河岸边坡稳定性常见的河水浸泡、超孔隙水压力、静水压力等影响机理进行了分析,对三类关键影响因素的敏感性进行了计算。研究结果表明:土体黏聚力c对边坡稳定性的影响最为显著,对水位降落的敏感性也最高,边坡土体内地下水位H_d对边坡稳定性的影响次之,边坡内摩擦角φ的影响则最不具有敏感性。

It is an important task to maintain the bank slope stability in river improvement. From the viewpoint of river improvement practices,the factors influencing slope stability are various,and between these factors,there exist complex internal relations. This paper analyzes the influencing mechanisms of common factors on bank slope stability at drawdown of water level,such as river water soaking,excess pore-pressure,hydrostatic pressure,etc. And also calculation on sensibility of the three kinds of key influence factors is made. Research results show that soil cohesion c has the most significant influence on slope stability,and also has the highest sensibility on drawdown; the underground water level H_d in slope soil is the second major factor influencing slope stability; the influence of internal friction angle of slope φ has the least sensibility.