前排桩倾斜的双排桩在水平荷载下的性状研究

Behaviors of double-row contiguous retaining piles with raking front-row piles under horizontal loads

为了研究将双排桩中的前排桩倾斜一定角度作为基坑围护结构时的工作机理,进行了8组模型试验,在模拟开挖过程中对前排桩倾斜的双排桩的桩顶水平位移、桩后土体沉降和桩身弯矩进行了量测。对比了不同倾角、不同排距及前后排桩不同布置形式时双排桩的工作性状,分析了前排桩倾斜的双排桩的位移、内力随前排桩倾斜角度变化而变化的规律。研究结果表明,同等条件下,前排桩倾斜的双排桩的桩顶位移小于常规双排桩的桩顶位移,就桩顶位移和桩身弯矩减少效果来说,前排桩存在一个最优倾斜角度。

A new type of double-row contiguous retaining piles as retaining structure is developed which uses raking piles in the front row piles.Eight model tests on the new type of double-row contiguous retaining piles are performed.The horizontal displacement at the top of the piles,the soil settlement behind the piles and the bending moment of the piles are measured during the process of excavation.The behaviors of the rules of displacement and internal force of the new type of double-row contiguous retaining piles are analyzed under variation of angle of inclination,distance between front and back row piles,as well as their layout.The test results show that the horizontal displacement decreases when the raking piles are introduced into the front row piles.There is an optimum angle of inclination to the raking piles in terms of the reduction of the horizontal displacement at pile top and pile bending moment.