土质边(滑)坡束筋型微型桩简化设计方法  

A Simplified Design of Micropile with Bundled Rebars for Soil Slopes or Landslides

作　　者：肖世国[1] 蒋楚生[2] XIAO Shiguo;JIANG Chusheng(Key Laboratory of High-speed Railway Engineering,Ministry of Education,Southwest Jiaotong University,Chengdu 610031,China;China Railway Eryuan Engineering Group Co.,Ltd.,Chengdu 610031,China)

机构地区：[1]西南交通大学高速铁路线路工程教育部重点实验室,成都610031 [2]中铁二院工程集团有限责任公司,成都610031

出　　处：《高速铁路技术》2023年第1期1-6,共6页High Speed Railway Technology

基　　金：国家自然科学基金资助项目(51278430);中铁二院工程集团有限责任公司科研项目(KSNQ201018);四川省交通运输科技项目(2020-A-01)。

摘　　要：束筋型微型桩是工程边坡治理或滑坡应急抢险工程中常用的轻型支挡结构。本文针对现行规范中基于抗弯模式的设计方法的复杂性与不确定性,提出了基于锚固模式的以加固边坡稳定性为控制目标的束筋型微型桩的简化设计方法。将微型桩轴力与剪力引入加固边坡的稳定性分析中,二者共同提供微型桩对坡体的抗滑力,通过传递系数法将其呈现于剩余推力计算表达式中。提出的方法可反映微型桩的竖向倾角、桩间距等要素对其内力的影响。实例分析表明,对于3排束筋型微型桩组成的单元抗滑结构,其后排桩承受轴向拉力、前排桩可能承受轴向压力,后排桩轴力绝对值最大,对微型桩结构设计起控制作用。Micropile with bundled rebars is a light retaining structure commonly used to treat slopes or control landslides emergencies.In view of the complexity and uncertainty of the design based on the bending mode in the current specifications,a simplified design of micropile with bundled rebars based on the anchoring mode and aimed at strengthening the slope stability is proposed in this paper.The axial force and shear force of the micropile were introduced into the stability analysis of the reinforced slope to provide the anti-sliding force of the micropile against the slope,which was then presented in the residual thrust computation expression by the transfer coefficient method.The proposed method can reflect the effect of vertical dip angle,pile spacing,and other factors of micropile on its internal force.The results of a case study show that for the unit anti-slide structure composed of 3 rows of micropiles with bundled rebars,the rear row of piles bears axial tension,the front row of piles may bear axial compression,and the rear row of piles has the largest absolute value of axial force,which plays a control role in the design of micropile structure.

关 键 词：土质边坡 微型桩 锚固作用 传递系数法 稳定性分析 

分 类 号：U416.14[交通运输工程—道路与铁道工程]