负摩阻力作用下锥形异型桩承载力研究  

Bearing capacity of cone pile under action of negative friction resistance

作　　者：代先尧[1] 王亮清[1] 李长冬[1] 王凯[1] 张永权[1] 

机构地区：[1]中国地质大学(武汉)工程学院,湖北武汉430074

出　　处：《煤田地质与勘探》2015年第3期77-80,共4页Coal Geology & Exploration

基　　金：国家自然科学基金项目(41202198;41372310);中央高校基本科研业务费专项资金"摇篮计划"(CUG130409);中国地质大学(武汉)2013年自主创新资助计划项目(1310491A06)

摘　　要：研制异型桩是降低负摩阻力的重要措施之一,对目前能降低负摩阻力的异型桩的种类和特征进行了系统分析与总结,并介绍了作者已授权的一项国家发明专利——一种端部螺纹X形变截面预制管桩及其施工方法。通过FLAC3D软件分别模拟了圆形等截面桩和锥形异型桩在相同地面堆载的情况下桩身轴力的分布情况,结果表明锥形纵截面的设置可以有效降低负摩阻力的影响。阐述了端部螺纹X形变截面预制管桩能更显著降低负摩阻力的机制,研究成果可为端部螺纹X形变截面预制管桩的设计和推广应用提供一定的理论基础。Development of special-shaped pile is one of the important measures to reduce the negative friction, the types and characteristics of the current special-shaped pile reducing the negative friction were analyzed and sum-marized, and the authors introduced a state authorized invention patent -- The thread at the end of the X shaped precast pipe pile and its construction method. Distribution of circular section pile and tapered special-shaped pile on the same surface load under the condition of axial force of pile were simulated respectively by FLAC3D software. Results show that the effect of longitudinal section of tapered settings can effectively reduce the negative friction. The mechanism of the thread at the end of the X shaped precast pipe pile which can significantly reduce the nega-tive friction was elaborated. The theoretical foundation for design and application of research results for the thread at the end of the X shaped precast pipe piles was provided.

关 键 词：锥形异型桩 负摩阻力 变截面 数值模拟 

分 类 号：TU473[建筑科学—结构工程]