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为进一步探讨挤扩支盘桩的承载性能及桩土相互作用机理,依托输电线路实际工程,开展了挤扩支盘桩上拔现场静载试验及有限元数值模拟,得到了支盘桩单桩抗拔承载性能,分析了支盘桩荷载传递规律、桩周土体变形规律、桩土相对位移变化情况等,探讨了支盘数量、支盘间距及水平荷载对支盘桩抗拔承载力的影响规律。结果表明:同等条件下单盘支盘桩抗拔承载力比等径灌注桩提高15.3%;轴力分布曲线及桩土相对位移在支盘位置发生突变;塑性应变主要发生在支盘上部的土体中;水平荷载的存在能提高支盘桩的抗拔承载力;一定范围内支盘桩的抗拔承载力随支盘数量及支盘间距的增加而增大,支盘间距不宜小于2.5倍支盘直径,在实际工程应用时,应予以考虑,合理确定支盘的数量或支盘间距。
In order to further discuss the bearing capacity of pile-squeezed branch pile and the interaction mechanism between pile and soil, relying on the actual project of transmission line, the on-site static load test and FEM numerical simulation of squeezed branch plate pile were carried out. The buckling load-bearing capacity of the pile, the law of load transfer of the pile, the deformation law of the soil around the pile and the relative displacement of the pile-soil are analyzed. The effects of the number of support plates, Affect the law. The results show that under the same conditions, the pull-out bearing capacity of single-plate pile is 15.3% higher than that of the same diameter cast-in-place pile; the axial force distribution curve and the relative displacement of pile and soil change suddenly at the branch; plastic strain mainly occurs in the soil Body; horizontal load can improve the buckling bearing capacity of branch pile; within a certain range, the buckling bearing capacity of branch pile increases with the number of branch plates and the spacing of branch plates, the distance between branch plates should not be less than 2.5 times The diameter of the support plate should be taken into account in the actual engineering application so that the number of support plates or the distance between support plates can be reasonably determined.