| 输变电线路铁塔变截面嵌岩桩受力特性的数值模拟分析 |
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| 引用本文： | 朱敏,孙珍茂,张衡,王雨佳.输变电线路铁塔变截面嵌岩桩受力特性的数值模拟分析[J].路基工程,2018,0(4):95. |
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| 作者姓名： | 朱敏 孙珍茂 张衡 王雨佳 |
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| 作者单位： | 1.西南交通大学土木工程学院, 成都 610031 |
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| 摘 要： | 变截面桩因具有高承载力、低造价的优点而得以广泛应用于软土场地。为了探究分层场地变截面桩适用性，以川藏联网输变电工程中广元地区铁塔桩基为例，通过数值模拟研究了相同嵌岩深度时变截面直径及嵌岩桩径对基桩竖向和水平承载特性的影响规律。结果表明:增大变截面直径和嵌岩桩径，均能提高极限承载力、控制桩顶沉降和水平位移。在竖向极限承载力方面，变截面直径存在一个最优值，该值等于扩大头直径。与等截面桩相比，变截面桩最多可以提高1.15倍竖向极限承载力，其提升作用主要表现在变截面处端阻力的增加，且基岩侧摩阻力的发挥程度也可从0
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| 关 键 词： | Abaqus 数值模拟 变截面直径 嵌岩桩径 承载力特性。 |
| 收稿时间： | 2019-11-11 |
Numerical Simulation Analysis on Mechanical Characteristics of Rock Socketed Piles with Variable Cross Section of Iron Tower in Transmission Line |
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| Abstract: | The variable cross-section pile has been widely used in soft soil sites because of its high capacity and low cost. In order to explore the applicability of a pile with variable cross section in the stratified site, based on the iron tower pile foundation in Guangyuan region in Sichuan and Tibet networking power transmission and transformation project, the numerical simulation has been conducted in this paper to study the influence law of variable cross-section diameter and rock socketed pile diameter on vertical and horizontal bearing capacity characteristics of the foundation piles with the same rock-socketed depth. The results show that the increase of the variable cross section diameter and rock socketed pile diameter can enhance the ultimate bearing capacity and control the settlement and horizontal displacement at the pile top. For the vertical ultimate bearing capacity, the variable section diameter has an optimal value, which is equal to the enlarged diameter of the head. As for variable cross section piles, the vertical ultimate bearing capacity can be up to 1.15 times higher than that of uniform section piles. In addition, the lifting effect is mainly contributed by the enlargement of the end resistance at the variable cross-section. Besides, the utilization of the bedrock lateral friction has increased from 0.54% to 8.00%. |
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