堆载对既有桥墩桩基础影响距离分析

发布时间：2018-02-22 10:14

本文关键词： 桩基础堆载桥墩高速铁路　出处：《水文地质工程地质》2017年01期 　论文类型：期刊论文

【摘要】：软土地基对外部环境的变化非常敏感,附近堆载对高速铁路既有桥墩基础可能产生重大影响,必须加以控制。以某高速铁路典型桥墩为例,建立三维有限元模型,分析了实际情况下堆载对桥墩变位的影响,其结果与实测数据吻合良好;然后变化堆载与桥墩之间的距离,详细地分析了不同距离下堆载对桥墩群桩基础的内力和变位的影响。结果表明:堆载与既有桥墩的距离越远,堆载对桥墩桩基础的内力和变位的影响越小。当堆载距离d小于软土层厚度h的4倍时,随d/h的增加,桥墩水平变位下降迅速;当d/h4时,随d/h的增加,桥墩水平变位下降缓慢。堆载与桥墩之间的控制距离取决于堆载规模、软土厚度和埋深、桥梁上部结构正常工作条件下所能容许的最大水平变位。
[Abstract]:The soft soil foundation is very sensitive to the change of external environment, and the nearby surcharge may have a great influence on the existing pier foundation of high-speed railway, which must be controlled. Taking a typical pier of a high-speed railway as an example, a three-dimensional finite element model is established. The influence of heaped load on the displacement of bridge pier is analyzed, and the results are in good agreement with the measured data, and then the distance between the heaped load and the pier is changed. The influence of surcharge on the internal force and displacement of pile group foundation at different distances is analyzed in detail. The results show that the distance between heaped load and existing pier is longer. When the surcharge distance d is less than 4 times the thickness of soft soil layer h, the horizontal displacement of pier decreases rapidly with the increase of d / h, and with d / h 4, with the increase of d / h, the horizontal displacement of the pier decreases rapidly. The control distance between the pile load and the pier depends on the scale of the surcharge, the thickness and depth of the soft soil, and the maximum horizontal displacement that can be allowed under the normal working conditions of the superstructure of the bridge.
【作者单位】：中南大学土木工程学院;重载铁路工程结构教育部重点实验室;高速铁路建造技术国家工程实验室;
【基金】：国家自然科学基金资助项目(51108464)
【分类号】：U443.15

【相似文献】