RTT位移模式挡土墙非极限状态被动土压力分析

Analysis on non-limit state passive earth pressure on retaining walls considing RTT displacement mode

挡土墙非极限状态土压力是常态化的。用滑动土楔和水平单元计算概念,就绕墙顶转动加平移之挡土墙被动土压力进行研究。结果表明,RTT位移模式挡土墙非极限被动土压力为上凹曲线分布,合力作用点在墙高的下三分区,随墙体转动和平移量增大,被动土压力非线性增长。墙体转动相对多,合力作用点下移,墙体平移相对较多,合力作用点上移。

The non-limit state earth pressure is normal on retaining walls. Based on the concept of quasi-slip plane and the method of horizontal layer analysis,the calculation of non-limit passive earth pressure on retaining walls in RTT displacement mode is studied. The results show that the non-limit passive earth pressure of the retaining wall is distributed in the upper concave curve,and the resultant points are in the lower three zones of the wall height,and the total value of passive earth pressure increases nonlinearly with the increase of wall rotation and translation. The wall rotates more and the resultant point moves down,the wall translates more and the resultant point moves up.