平移模式挡土墙非极限状态被动土压力有限元分析

Non-limit State Passive Earth Pressure on Translation Retaining Wall on FEM

采用有限元方法,就挡土墙平移挤压土体被动非极限状态的土压力进行研究。结果表明,墙背附近土体形成近似倒梯形的相对位移区,区内相邻点之间存在水平位移差和竖向位移差,相对位移区水平长度(2~3)墙高,墙体位移越大,相对位移区越大。挡土墙平动模式非极限状态被动土压力的分布近似直线。土压力由静止状态过渡至被动极限状态时,水平被动土压力总值增长速率逐渐减缓,其值始终小于库伦被动土压力。填土摩擦角越大,非极限状态被动土压力越大。

The non-limit state earth pressure on translation retaining wall is studied on FEM.It shows that there is a relative displacement area behind retaining wall and the backfill has different displacement and settlement in the area.The length of the relative displacement area is about 2 ~3 times of the of the retaining wall height.The greater the distribution of the retaining wall,the longer the relative displacement area.The distribution of the passive earth pressure is about linear.The resultant force increases first and decreases then when wall translation and the backfill friction angle increase.