变截面螺纹桩竖向承载特性试验研究

发布时间：2018-03-20 08:45

本文选题：变截面螺纹桩　切入点：模型试验　出处：《岩土力学》2017年03期 　论文类型：期刊论文

【摘要】：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。
[Abstract]:Variable cross section threaded pile is a new type of foundation treatment pile. The vertical bearing characteristics of variable cross section threaded pile are studied by laboratory model test and numerical simulation. This paper compares and analyzes the difference between the bearing characteristics of threaded pile with variable cross section and that of straight pile with common thread and plain cylindrical surface pile, and the influence of parameters of thread structure and soil on the vertical bearing capacity of threaded pile with variable cross section. The results show that, Under the same stratum condition, the material utilization ratio (limit load divided by pile body product) of variable cross-section threaded pile is about 1.3 times that of common equal-section threaded pile. Among the structural parameters of variable section threaded pile, thread width, thickness, spacing and change rate of pile body section are important factors affecting vertical bearing capacity of single pile, which should be fully considered in engineering design.
【作者单位】：西南交通大学地质工程系;铁道第三勘察设计院集团有限公司;中铁二院工程集团有限责任公司;
【基金】：国家自然科学基金(No.51278430) 中铁二院科研计划(No.13164197(13-15))~~
【分类号】：TU473.1

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