考虑水位升降的荆江河段高滩岸坡流固耦合分析

以荆江河段高滩岸坡为背景,考虑长江荆江河段的水位变化特点,基于流固耦合理论,应用Geo-Studio软件对岸坡进行流固耦合数值模拟,得到了应力场及位移场的变化规律。分析结果表明:1坡顶的水平位移随着水位上升而增大,坡脚处则随着水位上升,水平位移减小;随着水位下降,坡脚水平位移逐渐增大;岸坡最大位移发生在水位下降末期,其位置位于高程约25 m处。2岸坡内剪应力的大小随着坡前水位上升而减小,随着坡前水位降落而增大,水位下降末期,坡内剪应力最大,此时最易发生边坡失稳。研究成果可为长江荆江河段岸坡稳定性治理及类似工程提供参考。

Fluid-solid Coupling Analysis of Jingjiang River Reaches High Floodplains Considering River Level Fluctuations

This paper is based on high floodplains bank slope in Jingjiang. According to the features of water level variation in Jingjiang reaches of Yangtze River, based on fluid-solid coupling theory, a fluid-solid coupling numerical simulation of bank slope is carried out through the Geo-Studio software, and the change law about the stress field and displacement field is obtained. The analysis results show that when the water level rises,the horizontal displacement of slope top increases but the displacement of slope toe decreases ,and the displacement of slope toe increases with the water level rises. The maximum displacement of the slope occurs during the end of water level drop stage, the maximum horizontal displacement is 220mm, its location at the elevation of about 25m. The shear stress of slope decreases when water level rises and it increases when water level drops. At the end of the water level drop stage, the shear stress in the slope is the largest, and the slope is unstable at this time.