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通过理论分析和有限元技术,建立了综合考虑河流冲刷力、渗透力、自重应力耦合力系下的堤岸(水上、水下)与河床的整体分析模型,直接分析河流冲刷作用对堤岸渗流和变形的影响,并结合强度折减有限元法分析河流冲刷对堤岸边坡整体稳定性的影响。结果表明,渗透流速的最大值出现在堤脚,冲刷作用使堤岸的渗透流速有所提高,并使堤岸坡脚沿外江方向的水平位移明显增加,愈靠近坡脚,外江方向水平位移增加的幅度愈大,在不同水位下堤脚都是最易受到渗流和冲刷影响的地方;河流冲刷进一步加大了堤岸和河床塑性区范围,堤岸的安全系数降低;河流冲刷对堤岸渗流和变形产生的影响随着河水位的上升而加剧,河水位越高,冲刷作用使堤岸稳定性降低的幅度越大。
Through the theoretical analysis and finite element analysis, a comprehensive analysis model of embankment (water, submarine) and riverbed considering the coupling force of river scouring force, seepage force and self-weight stress is established, which directly analyzes the effect of river scouring on the embankment seepage and deformation The influence of river scouring on the whole stability of embankment slope was analyzed by combining strength reduction finite element method. The results show that the maximum infiltration velocity appears at the levee, and the scouring effect increases the infiltration velocity of the levee and increases the horizontal displacement of the levee along the outer river. The larger the amplitude is, the embankments are the most susceptible to seepage and erosion at different water levels; river scour further enlarges the plastic zone of embankments and riverbed and reduces the safety factor of embankments; The impact is aggravated by the rise of the water level. The higher the water level, the greater the erosion of the embankment.