预应力混凝土板桩-冠梁协同支护作用机理

以湖岸支护工程为例，基于有限元模拟研究了支护结构内力及变形、地表沉降、基坑隆起以及土压力分布情况，探讨了桩顶锚固形式和板桩嵌固深度，得到板桩-冠梁协同支护体系工作机理。 研究表明:板桩-冠梁协同支护体系的桩土协同作用机制与有锚板桩相似，桩体变形呈现中部鼓出状，主动土压力呈R 形分布；桩顶冠梁锚固以及桩底嵌固作用是影响板桩支护性能的重要因素，板桩最佳嵌固深度比为0.69~0.79。 研究成果可为相关板桩支护的设计和工程应用提供参考借鉴。

Synergistic support mechanism of prestressed concrete sheet-pile with crown beam

Taking the lake bank support project as an example, based on the finite element simulation, the internal force and deformation of the support structure, surface settlement, foundation pit uplift and soil pressure distribution were studied. The anchorage form of the pile top and the embedded depth of the sheet pile were discussed, and the working mechanism of the sheet pile crown beam support system was obtained. Results show that the pile-soil interaction mechanism of sheet pile crown beam retaining system is similar to that of anchored sheet pile; the deformation of the pile is the bulging in the middle, and the active soil pressure is distributed in R shape; the anchorage of pile crown beam and the embedding effect of pile bottom are important factors affecting the support performance of sheet pile; the optimal embedding depth ratio of sheet pile is 0.69 ~ 0.79. The research results can provide reference for the design and engineering application of sheet pile support.