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考虑土拱效应的影响,采用圆弧形拱作为小主应力轨迹,以粘性填土平行挡土墙为研究对象进行了研究。充分考虑墙土摩擦角、填土内摩擦角、填土粘聚力、竖向均布荷载、平行挡土墙间的水平距离等多种影响因素,运用力学单元平衡方程和摩尔-库伦强度理论推导了平行挡土墙侧向土压力系数和侧向土压力计算公式。最后通过算例分析得出墙土摩擦角部分发挥和充分发挥,以及平行挡土墙间水平距离对墙侧向土压力的影响变化规律。结果表明:考虑土拱效应的侧向土压力系数和侧向土压力沿深度为非线性分布,并且其与墙土摩擦角、填土内摩擦角、填土粘聚力、竖向均布荷载、平行挡土墙间的水平距离有关;不考虑土拱效应的常规方法计算得到的土压力偏不安全。
Considering the effect of soil arching effect, circular arched arch was used as the trajectory of small principal stress, and the viscous soil retaining wall was taken as the research object. Taking full account of various factors such as the friction angle of the soil, the internal friction angle of the soil, the cohesion of the fill, the vertical uniform load and the horizontal distance between the parallel retaining walls, the equilibrium equations of the mechanical unit and the Mohr-Coulomb’s strength theory The formulas for calculating the lateral earth pressure coefficient and lateral earth pressure of parallel retaining walls are deduced. Finally, the influence of the horizontal distance between the parallel retaining walls on the lateral soil pressure on the wall is obtained through the example analysis. The results show that lateral soil pressure coefficient and lateral soil pressure considering soil arching effect are non-linear distribution along the depth and are related to friction angle of wall soil, internal friction angle of filling soil, cohesion of filling soil, vertical uniform load , The horizontal distance between parallel retaining walls; the earth pressure calculated by the conventional method without soil arching effect is unsafe.