洪水位变化对岸滩稳定性的影响

为了较全面地了解洪水涨落对岸滩崩塌的影响,本文通过对洪水期岸滩受力分析,结合岸滩土体性质和洪水浸泡岸滩特点,给出洪水期岸滩稳定系数;进而分析了洪水降落期岸滩稳定性变化,指出洪水骤降时,长期洪水浸泡后黏土岸滩稳定系数将会大幅度减小;在洪水缓慢降落时,黏性岸滩稳定性减小,但减小幅度小于骤降的情况。通过分析对比洪水上涨、洪水浸泡和洪水降落等不同过程的稳定性,指出洪水迅速上涨期岸滩稳定性最好,依次为洪水缓慢上涨期、洪水浸泡期和洪水缓慢下降期,洪水骤降期岸滩稳定性最差。

Impacts of water level fluctuations on bank stability during flood period

In order to more fully understand the impacts of flood fluctuations on bank collapse, the bank stability coefficient during the flood period is given through the force analysis of the bank body, with con- sidering the soil properties and flood immersion characteristics of the river bank, and the bank stability changes in the process of the flood drop are further analyzed in this paper. It is pointed out that the stabili- ty coefficient of the clay bank with long-term flood immersion will decrease greatly after the flood falling. The stability coefficient of viscous bank will decrease during the flood slow recession period,but it is less than the flood falling. Through comparing stability coefficients in the different periods such as flood rising, flood immersion and flood recession, it is indicated that the bank stability is the best during the process of rapid flood rising, followed by the periods of flood rising slowly, the flood immersion and flood slow re- cession weakened in turn,and the worst bank stability is that during the flood descending period.