基于坡面冲刷的荆江典型岸坡稳定性分析

发布时间：2018-05-08 13:52

本文选题：岸坡稳定 + 坡面冲刷　；参考：《长江科学院院报》2017年08期

【摘要】：针对荆江典型二元结构的岸坡,采用横向冲刷计算公式探讨了不同水位升降阶段中,水流流速和含沙量对岸坡横向冲刷速率的影响以及岸坡断面形态的变化规律。在此基础上基于饱和-非饱和渗流理论,利用SEEP/w程序建立了二维非稳态渗流模型,模拟了其渗流场在水位升降条件下的变化过程,并基于摩根斯坦法计算分析了在考虑与不考虑坡面冲刷2种条件下岸坡稳定性的变化规律。结果表明:在水位上升期,当不考虑坡面冲刷时,岸坡稳定性是随水位上升而增大的,但当考虑坡面冲刷后,岸坡坡度逐渐增大,岸坡稳定性随水位上升而减小;在水位下降期,岸坡稳定性随水位下降而减小,且考虑坡面冲刷的安全系数下降速率明显大于未考虑冲刷时的情况。因此洪水期与水位下降末期是岸坡失稳的危险期,需重点监控。
[Abstract]:In view of the typical binary structure bank slope of Jingjiang River, the influence of flow velocity and sediment content on the lateral erosion rate of bank slope and the variation law of slope cross section shape are discussed by using lateral scour calculation formula in different stages of water level rise and fall. Based on the saturated-unsaturated seepage theory, a two-dimensional unsteady seepage model is established by using SEEP/w program, and the variation process of the seepage field under the condition of water level rise and fall is simulated. Based on the Morgenstein method, the variation of slope stability is analyzed under the condition of considering and not considering the erosion of slope surface. The results show that during the rising of water level, the slope stability increases with the increase of water level, but the slope gradient increases gradually and the slope stability decreases with the increase of water level. In the period of water level decline, the slope stability decreases with the decrease of water level, and the decreasing rate of safety factor considering erosion on slope surface is obviously higher than that when scour is not considered. Therefore, flood period and the end of water level fall are dangerous periods of bank slope instability, which need to be monitored.
【作者单位】：河海大学港口海岸与近海工程学院;中交第四航务工程勘察设计院有限公司;长江南京航道工程局;
【分类号】：TV223

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