重力式挡墙下基础的设计方法探讨

Discussion on the Design Methods of Foundation under Gravity Retaining Wall

对于重力式挡墙下筏式条基，采用不同的布置方式直接影响其造价。文章从理论上探讨了筏式条基的合理布置，并且通过工程实例验证了当筏式条基截面中心偏离挡墙合力点为e0与B／30中较小者时，筏式条基按受弯计算所需的配筋要比筏式条基截面中心与挡墙合力点重合时节省9～14％的配筋。当筏式条基底部土层沉降已基本完成且能提供100KPa左右以上地基承载力特征值时，建议设计时采用方案2所述的挡墙基础布置方式。

For raft-like strip footing under gravity retaining wall, there are different disposal modes which influence the cost of the foundation directly. The reasonable disposal mode is probed into theoretically in this article, and it is validated by engineering example that the tensile bar needed under bending can be saved by 9-14% when the seetion center of raft-like strip footing is the lesser of e0 and B/30 from the resultant foree point of retaining wall, in comparison with the ease when two points are superposed. When the settlement of soil under the footing was ultimately completed and the characteristic value of subgrade bearing capacity was greater than 100kPa, the disposal mode of retaining wall foundation of scheme 2 was advised for design.