In order to study the effect of the soil arching on the nonlinear distribution of active pressure on the rigid retaining wall, the distribution of active pressure with rigid retaining wall movement model of rotation about top (RT) was simulated by meso-scale particle flow code 2D (PFC2D), and the soil arching for the rigid retaining wall active failure was also simulated. In order to analyze the soil arching, the ratio of span to soil height (SH) and the ratio of rise to soil height (RH) were defined. The results show that when SH and RH become larger, the soil arching is more distinguished.The meso-scale study method is available to simulate the distribution of active pressure on rigid retaining wall with movement model.The soil arching for retaining wall active failure is formed in the specific area from the top of retaining wall to 0.4H(H is the height of retaining wall), and in the specific condition of the movement model of RT and the displacement is less than 0.05H, the soil arch is not remarkable in other movement model, thus the soil arching should be considered for calculating the distribution of earth pressure on rigid retaining wall with the movement model of RT. When the coefficient of particle and wall is larger and the stiffness of particle is smaller, the soil arching becomes more obvious.%为了研究土拱效应对挡墙主动土压力非线性分布的影响,运用细观颗粒流方法研究挡墙绕墙顶部转动主动土压力分布和墙后土拱效应细观形成机理,提出跨高比和矢高比表征土拱曲线.研究结果表明:跨高比和矢高比越大,则土拱效应越明显;细观颗粒流方法能够较好地模拟挡墙绕墙顶转动主动土压力分布;当挡墙绕墙顶转动、挡墙位移小于0.05H(H为墙高)时,沿墙高到墙顶0.4H范围内土拱效应较明显,主动土压力呈显著非线性分布;在其他位移模式和位移情况下土拱效应不明显,计算挡墙绕墙顶转动土压力时应考虑土拱效应的影响;若土颗粒和墙体摩擦因素越大,土颗粒刚度越小,则土拱效应越显著.
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