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旋挖挤扩灌注桩在桩身上通过旋挖挤扩技术形成多个承力盘,承力盘有效的扩大了承载面积,盘上表面阻力能有效提高桩的抗拔承载力。同时由于承力盘位于桩身,与扩底桩的扩大头位于桩底不同,在桩身位移较小的条件下承力盘就能发挥较高的承载力。本文通过室内砂箱模型实验,对于旋挖挤扩灌注桩的抗拔机理进行了初步的实验研究。对比了不同位置单盘、双盘旋挖挤扩桩以及直孔桩的抗拔承载力。在此基础上,利用有限元对实验过程进行了同步模拟,对实验成果进行了验证。
Rotary excavation and expansion grouting pile forms a plurality of bearing plates on the pile body by means of digging and extruding and expanding. The bearing plate effectively enlarges the bearing area. The resistance on the plate surface can effectively increase the bearing capacity of the pile. At the same time, because the bearing plate is located on the pile body, the enlarged head of the expanded pile is located at the bottom of the pile, and the bearing plate can exert a higher bearing capacity under the condition of smaller displacement of the pile body. In this paper, through the laboratory flask model experiment, the preliminary experimental study on the pull-out mechanism of the screw-grouting piles was carried out. The pull-out bearing capacity of single-disc, double-disc screw-crowded pile and straight-hole pile were compared. On this basis, the experimental process was simulated by finite element method and the experimental results were verified.