“人”字形微型桩体系内力计算方法比较研究  

Comparative Research on Internal Force Calculations of Herringbone Micropiles System on Sliding Surface

作　　者：安孟康 郑静 孟进宝 苏俊霞 

机构地区：[1]中铁西北科学研究院有限公司,兰州730000

出　　处：《铁道工程学报》2015年第3期16-20,共5页Journal of Railway Engineering Society

基　　金：科技部科研院所技术开发研究专项资金项目(2009EG123201)

摘　　要：研究目的:工程上一般将顶部连接的微型桩抗滑结构体系简化为单桩受推力作用模型,以计算荷载在滑面处产生的内力,没有将其按照体系结构考虑。本文将"人"字形微型桩体系滑面以上部分分别简化为独立单桩模型、顶部铰接刚架结构模型和顶部固定连接刚架结构模型,在滑坡推力为矩形分布条件下,推导滑面处内力的计算公式并进行对比研究。研究结论:(1)简化为独立单桩模型的计算公式同刚架结构模型计算公式比较,存在较大差异;(2)按照刚架结构模型计算,滑面处弯矩和剪力均显著减小,轴向力增大,表明简化模型计算方法不适用于微型桩体系内力计算,该简化模型计算结果对微型桩体系的桩体抗拔力考虑不足,计算也表明刚架结构的顶部连接方式对计算结果影响相对较小;(3)本研究成果可供类似抗滑结构体系设计时参考和借鉴。Research purposes： Generally, for structure system of micro - pile connection on the top, it calculates the internal force on sliding surface by summing each pill force, but not considering the structure is unreasonable. In this paper, the herringbone micro - pile above the sliding surface is divided into three types ： single pile, top - hinged - joint steel frame construction and top - fixed - connection steel frame construction. Under the condition of landslide force which is rectangular distribution, the calculation formula of internal force of sliding surface is deduced and comparatively studied. Research conclusions： （ 1 ） Comparing the calculation formula of simplified single pile model with frame structure model, the results make a big difference. （2） Under the calculation method of frame structure model, the bending moment and shear force are dwindling but axial force is increasing. It indicates that the method does not apply to force calculation of the micro - pile system. This calculation result of simplified model take insufficient account to withdrawal resistance of pile body in micro - pile system. The calculation also indicates that the method of top - connection steel frame construction has less effect to calculation result. （3） The research result can be referenced in designing area of similar anti -slide structure system.

关 键 词：微型桩结构 桩顶连接方式 滑面 荷载计算 

分 类 号：TU473.11[建筑科学—结构工程]