考虑位移影响刚性挡土墙主动土压力分析

Active earth pressure of rigid retaining wall considering wall movement

基于库仑土压力理论和Dubrova压力重分布法,提出一种改进的重力式挡土墙主动土压力分析方法。该方法能反映挡土墙变位模式和位移大小的影响,还能考虑和挡墙位移相关的墙后填土发挥的内摩擦角对土压力分布的影响。分析结果表明,随着挡土墙顶位移的增大,墙后填土达到极限平衡状态的区域逐渐增大,墙后土压力逐渐减小;只有当墙顶位移充分大时,才能达到库仑主动极限平衡状态,相应的土压力等于库仑主动土压力。

Based on Coulomb earth pressure theory and Dubrova＇s method of redistribution of pressure,a modified active earth pressure method is presented.Such method can reflect the influence of the mode of rotation and wall displacement,and the mobilization of shearing resistance in the backfill as affected by the wall movement is considered in a simplified manner,which is associated with the distribution of earth pressure.The analysis shows that as the displacement of wall top increases,the zone of limit equilibrium condition of backfill after the wall increases progressively,and the earth pressure decreases accordingly.When the displacement of wall top is large enough,Coulomb＇s active limit equilibriu condition can be attainned,and the earth pressure is equal to Coulomb＇s active earth pressure.