基于 BSTEM 的长江中游河道岸坡稳定性分析简

 以长江中游荆江出口熊家洲至城陵矶段典型断面为例，利用河岸稳定性与坡脚侵蚀模型(BSTEM)计算了2个典型断面在不同自然条件下的岸坡形态、水位条件、坡脚横向冲刷距离、植被类型及有护岸工程条件下河岸稳定的安全系数，分析了这些因素对河道岸坡稳定性的影响。结论表明:水位变化对河岸稳定性有重要影响，高、低水位岸坡稳定性与河岸组成密切相关，退水速率较快时，安全系数大幅度减小，易引起崩岸的发生；不同岸坡形态下河岸安全系数也不同，均随着坡脚横向冲刷距离的增大而减小；坡面实施护岸工程与植被覆盖会增加岸坡的稳定性。

Stability Analysis for Typical Riverbank Slope in the Middle Reach of Yangtze River by BSTEM

By using BSTEM (Bank Stability and Toe Erosion Model),the stability safety factors of two typical sections are calculated respectively under different conditions. These conditions include bank slope morphology,water level,lateral erosion distance of toe,vegetation type and revetment project. The impact of these factors on the river bank slope stability are also analyzed. Results show that water level variation has significant impact on riverbank stability. The stability of bank slope with high and low water levels is closely related with the riverbank composition. When the rate of water level recession is high,the safety factor reduces remarkably which is prone to cause bank collapse. It also shows that the safety factors are different in different bank slope morphologies,and the safety factor decreases as the lateral erosion distance of toe increases. Revetment project and vegetation coverage will increase the bank slope stability.