刚性挡土墙主动土压力颗粒流模拟

将土体离散为具有滑动连接模型的刚性条块，用颗粒流PFC2D程序数值从细观力学角度模拟了墙体平移(T)、绕墙底转动(RB)和绕墙顶转动(RT)位移模式下不同位移大小时刚性挡土主动土压力分布。模拟结果表明：刚性挡墙主动土压力非线性分布、墙土间外摩擦角和土体剪切角或内摩擦角对土压力有很大影响；墙体绕顶部转动时，大约0.3倍墙高以上的主动土压力大于静止土压力产生土拱效应；模拟计算值与模型试验实测数据吻合比较好，具有一定的理论价值。

Particle flow simulation of active earth pressure distribution on rigid retaining wall

Soil mass is treated as rigid blocks with slip contact models, active earth pressure distribution on rigid retaining wall is simulated by particle flow code (PFC2D) program under certain displacement of different wall movement models: translation(T), rotation about bottom(RB), and rotation about top(RT). The simulating results of model test show that the active earth pressure distribution on rigid retaining wall is nonlinear; and the out friction angle between soil and retaining wall, as well as the soil shear angle are significant effect on active earth pressure. The resting earth pressure is larger than the active earth pressure in 0.3 times height of retaining wall from the top, as result the soil arching is formed. At last the calculation values are in consistence with model test ones very well; so the method presented has theoretical value.