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基于墙面摩擦系数对土拱效应的影响,提出了层间等效内摩擦角的概念,并将其应用到水平层微分单元法中,推导出了平移模式下刚性挡土墙被动土压力的理论计算公式。然后与离散元数值模拟得到了有、无墙面摩擦的墙后土体的被动土压力分布规律进行了对比。结果表明:墙面摩擦是土拱效应产生的主要因素;当墙面粗糙时,被动土压力随墙深的增加而增大,而墙面光滑时,被动土压力首先增大然后又减小;理论计算与数值试验和模型试验得到的被动土压力分布规律吻合较好,表明了通过层间等效内摩擦角来考虑土拱效应的合理性。
Based on the influence of wall friction coefficient on soil arching effect, the concept of interlayer equivalent internal friction angle is put forward and applied to the horizontal differential layer element method. The passive earth pressure of rigid retaining wall in translation mode is deduced Theoretical calculation formula. Then, with the discrete element numerical simulation, the distribution of passive earth pressure of the soil with and without wall friction was compared. The results show that the wall friction is the main factor of soil arching. When the wall roughness, the passive earth pressure increases with the increase of the wall depth. When the wall is smooth, the passive earth pressure first increases and then decreases. The theoretical calculation is in good agreement with the distribution of passive earth pressure obtained by numerical experiments and model tests, which shows the rationality of considering soil arching effect through the equivalent internal friction angle between layers.