爆扩抗拔钢桩的承载特性分析

发布时间：2018-04-13 18:43

本文选题：爆扩抗拔钢桩 + 爆扩球　；参考：《公路》2016年01期

【摘要】：结合陆地扩底抗拔桩的承载优势与现有海底抗拔桩的局限性及海上复杂的施工环境,提出了一种新的扩底抗拔桩形式——爆扩抗拔钢桩。利用ABAQUS有限元软件建立有限元桩土接触模型。提取模型计算结果中的Q~S曲线及桩身轴力来分析桩土之间应力扩散路径以及爆扩球的直径、位置高度、数量对桩承载性状影响。结果表明,等截面桩在竖向拉力荷载的作用下,主要是通过桩土之间的摩擦将荷载一点点传递到桩周土体中去,再在土体中扩散。而爆扩抗拔钢桩作为扩充桩,在竖向拉力荷载的作用下,除了通过桩土摩擦这一条荷载传递路径之外,也可以通过爆扩球来将荷载传递到周边土体当中去。并且,爆扩抗拔钢桩的设计要求爆扩球应该是作为一种主要的荷载传递路径存在的。竖向承载力随着爆扩球直径、数量的增大而增大,并且影响较大,但随着爆扩球位置高度的增加而减小。
[Abstract]:Combined with the bearing advantage of the uplift pile on the ground, the limitation of the existing submarine uplift pile and the complicated construction environment at sea, a new type of steel pile with explosive expansion and drawing resistance is put forward in this paper.A finite element pile-soil contact model is established by using ABAQUS finite element software.The QS curve and the axial force of the pile body are extracted from the results of the model to analyze the influence of the stress diffusion path between the piles and the diameter, position height and quantity of the exploding ball on the bearing behavior of the pile.The results show that the load is transferred to the soil around the pile by friction between piles and then diffused in the soil under the action of vertical tensile load.As an expanded pile, under the action of vertical tensile load, the explosive expansion steel pile can transfer the load to the surrounding soil by blasting and expanding the ball in addition to the load transfer path of friction between pile and soil.Moreover, the design of explosion-expanding steel pile requires that the explosion-expanding ball should exist as a main load transfer path.The vertical bearing capacity increases with the increase of the diameter and quantity of the ball, but decreases with the increase of the height of the ball.
【作者单位】：太原理工大学建筑与土木工程学院;
【基金】：山西省“百人计划”高层次人才项目山西省重点学科资助项目山西高校“131”领军人才工程项目
【分类号】：TU473.1

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