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将颗粒抗转动模型引入离散元程序中,模拟了砂性填土刚性挡土墙平移过程中的被动土压力发展过程,对比分析了考虑和不考虑抗转两种情况下墙后土压力随位移的变化规律及墙后填土微观物理量的变化规律,揭示了颗粒抗转动能力对墙后土压力大小和分布的影响。研究结果表明,不管是否考虑颗粒抗转动作用,被动土压力沿墙深基本呈线性分布,且合力作用点维持在距墙底1/3墙高处,但考虑颗粒抗转动作用时总土压力随位移量增大的幅度更加明显,且模拟结果更接近Coulomb理论解。平均纯转动率的分析结果表明,挡墙平移时墙底处颗粒转动速度较大,该处能量消散较快;若考虑颗粒抗转动作用时,该处平均纯转动率值增加。
The particle anti-rotation model is introduced into the discrete element program to simulate the process of passive earth pressure during the translation of sand-filled rigid retaining wall. The earth pressures behind the wall with and without considering anti-rotation are comparatively analyzed. And the change rule of microscopic physical quantity of backfill, the influence of particle anti-rotation ability on the pressure and distribution of earth pressure behind the wall was revealed. The results show that the passive earth pressure is basically linearly distributed along the wall depth and the resultant force point is maintained at a height of 1/3 of the wall from the bottom of the wall, irrespective of whether particles are considered for anti-rotation. However, considering the anti-rotation effect of particles, the total earth pressure The magnitude of displacement increase is more obvious, and the simulation results are closer to Coulomb theoretical solution. The analysis of the average pure rotation rate shows that the particle rotation speed at the wall bottom is large when the retaining wall is translating, and the energy dissipates rapidly at this wall. The average pure rotational rate increases when the particle’s anti-rotation effect is taken into account.