【摘要】 为防止黄河大堤发生渗漏、管涌等险情,确保郑焦城际铁路桥跨越黄河大堤工程安全,建立考虑渗流场与应力场耦合作用的三维大堤数值模型,分析堤前水深、高聚物防渗墙厚度和密度等因素对大堤防渗墙体应力变形规律的影响。结果表明:高聚物防渗墙防渗效果及稳定性优于混凝土防渗墙;高聚物防渗墙厚度越大,墙体的水平位移和受到的竖向压应力越小,墙体所受竖向压应力随墙体高度增加减小;堤前水位越高墙体所受压应力越小,水平位移越大;当高聚物取不同密度时,墙体水平位移变化规律一致,随着墙高增加先增大后减小,位移最大部位在墙体中部。更多还原

【Abstract】 In order to prevent seepage and piping of the Yellow River dyke and ensure the safety of Zheng-Jiao Intercity Railway Bridge crossing the Yellow River embankment, a three-dimensional numerical model of the embankment considering the coupling effect of seepage field and stress field was established. The effects of water level, thickness and density of the polymer cut-off wall on the stress and deformation law of the cut-off wall of the embankment were analyzed. The results show that the anti-seepage effect and stability of the polymer cut-off wall are better than that of the concrete cut-off wall; the greater the thickness of the polymer cut-off wall, the smaller the horizontal displacement and vertical compressive stress of the wall, and the vertical compressive stress is negatively correlated with the height of the wall;the higher the water level in front of the embankment, the smaller the compressive stress of the wall and the greater the horizontal displacement. When the polymer density is different, the horizontal displacement of the wall first increases and then decreases with the height of the wall and the maximum displacement is in the middle of the wall.更多还原