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变截面螺纹桩是一种新型地基处理桩型。通过室内模型试验和数值模拟,研究了变截面螺纹桩的竖向承载特性,比较分析了变截面螺纹桩与普通螺纹直桩和普通圆柱形光面直桩承载特性的差异,以及螺纹结构参数和地基土体参数对变截面螺纹桩竖向承载能力的影响规律。结果表明,变截面螺纹桩的螺纹结构及圆台形桩身能大幅度提高侧摩阻力;相同地层条件下,变截面螺纹桩桩身材料利用率(极限荷载除以桩身体积)是普通等截面螺纹桩的1.3倍左右,是普通圆柱形光面直桩的3倍左右;变截面螺纹桩的结构参数中,螺纹宽度、厚度、间距及桩身截面变化率是影响单桩竖向承载力的重要因素,在工程设计中应予以充分考虑。
Variable section screw pile is a new type of foundation treatment pile. Through the indoor model test and numerical simulation, the vertical bearing characteristics of the variable cross-section screw pile are studied, and the difference of bearing characteristics between the variable cross-section screw pile and the ordinary screw straight pile and the ordinary cylindrical smooth pile is analyzed. Influence of foundation soil parameters on vertical bearing capacity of variable cross section screw pile. The results show that the thread structure of the variable cross-section screw pile and the truncated cone can greatly increase the side frictional resistance. Under the same formation conditions, the material utilization ratio (ultimate load divided by the pile body volume) About 1.3 times that of the screw pile, which is about 3 times of that of an ordinary cylindrical smooth pile; among the structural parameters of the variable cross-section screw pile, the width, thickness, spacing of the screw thread and the rate of change of the pile section are the factors affecting the vertical bearing capacity of the pile Important factors in engineering design should be fully considered.