高陡斜坡段桩柱式桥墩基础设计计算方法研究  

THE DESIGN AND CALCULATION METHOD OF PILE-COLUMN BRIDGE PIER FOUNDATION IN HIGH AND STEEP SLOPE

作　　者：赵明华[1] 尹平保[1] 张永杰[2] 杨明辉[1] 

机构地区：[1]湖南大学岩土工程研究所,湖南长沙410082 [2]长沙理工大学土木与建筑学院,湖南长沙410004

出　　处：《工程力学》2013年第3期106-111,共6页Engineering Mechanics

基　　金：国家自然科学基金项目(50878083);交通部西部建设科技项目(200831878531);湖南省研究生科研创新项目(CX2011B160)

摘　　要：与平地上的桥梁基桩相比,高陡斜坡段桩柱式桥墩基础的承载机理主要包括陡坡效应和嵌固深度效应。首先,根据极限平衡理论推导了高陡边坡剩余下滑力的计算公式;其次,通过对桩柱微元进行受力分析,得到了高陡斜坡段桩柱式桥墩基础内力与变形分析的挠曲变形微分方程及其幂级数解答;经过模型试验的对比分析,验证了该解答的合理性。在此基础上,通过对某工程实例的对比分析,探讨了桩径、嵌固深度以及边坡安全系数等对基桩设计与验算的影响,进而提出了高陡斜坡段桩柱式桥墩基础的设计计算方法,以期为桥梁基桩设计提供参考。Compared with bridge piles in fat ground, the bearing mechanism of a pile-column bridge pier foundation in a high and steep slope mainly includes a steep slope effect and an embedded depth effect. Firstly, the residual sliding force of high and steep slopes is deduced based on the theory of limit equilibrium. Secondly, based on the force analysis of a pile-column micro-unit, the deflection differential equation and power series solution of internal force and deformation analysis are derived. The rationality of the solution is verified after the comparative analysis of a model test. On this basis, the pile diameter, embedded depths and safety factors of slopes for pile-column design and calculation are discussed through the comparative analysis of a project example. And then the design and calculation method of a pile-column bridge pier foundation in a high and steep slope is proposed, in order to give a reference for bridge pile design.

关 键 词：桥梁工程 高陡斜坡 桩柱式桥墩 承载机理 安全系数 受力分析 

分 类 号：TU473[建筑科学—结构工程] U443.15[建筑科学—土工工程]