基于涪丰石高速乌江特大桥的超大直径嵌岩桩设计

发布时间：2018-03-17 13:30

本文选题：桥梁工程　切入点：超大直径嵌岩桩　出处：《公路交通科技》2015年06期 　论文类型：期刊论文

【摘要】：为了掌握复杂岩溶地质条件下超大直径嵌岩桩的受力特性和设计要素变化规律,重点研究了嵌岩摩擦桩的荷载传递、桩侧摩阻力的传力机理、摩阻力的计算方法及其与设计要素的关系、摩阻力充分发挥的影响要素等。建立全桥有限元模型进行总体分析,采用群桩基础实体有限元模型进行局部分析对比,并引入影响要素定量参数化的承载力计算修正公式。研究结果表明,对于溶蚀孔洞较为发育的岩石地质区,当结构竖向荷载较大时可采用大直径嵌岩桩的基础型式,设计时应综合考虑岩石特性孔、壁粗糙度等外部因素和桩身强度、桩基半径等设计要素,通过计算分析比较确定合理的桩基规模,并根据外部影响因素对桩基承载力进行修正计算。
[Abstract]:In order to understand the stress characteristics and design elements of large diameter rock-socketed pile under complex karst geological conditions, the load transfer of rock-socketed friction pile and the mechanism of lateral friction force transfer are studied. The calculation method of frictional resistance and its relation with design elements, the influence factors of full exertion of frictional resistance and so on. The whole bridge finite element model is established for overall analysis, and the local analysis and comparison are carried out by using the finite element model of pile group foundation. A modified formula for calculating the bearing capacity is introduced, which affects the quantitative parameterization of the elements. The results show that the foundation type of large diameter rock-socketed pile can be adopted when the vertical load of the structure is large in the rock geological area where the dissolution hole is more developed. When designing, the external factors such as rock characteristic hole, wall roughness, pile body strength and pile foundation radius should be considered synthetically, and the reasonable pile foundation scale should be determined by calculation and comparison. According to the external influence factors, the bearing capacity of pile foundation is revised and calculated.
【作者单位】：中交公路规划设计院有限公司;交通运输部公路科学研究所;
【基金】：交通部西部交通建设科技项目(200331849457)
【分类号】：U443.15

【参考文献】