树根桩与预应力桩联合加固边坡稳定分析  

Analysis of the stability and sensitivity of slope reinforcement using combined root piles and prestressed piles

作　　者：成潇博 姚华彦[1] 汪明武[1] 李远荣 丁飞 梁国超 CHENG Xiaobo;YAO Huayan;WANG Mingwu;LI Yuanrong;DING Fei;LIANG Guochao(College of Civil Engineering,Hefei University of Technology,Hefei 230009,China;Municipal Engineering Branch,China Coal Third Construction(Group)Co.,Ltd.,Hefei 230031,China)

机构地区：[1]合肥工业大学土木与水利工程学院,安徽合肥230009 [2]中煤第三建设(集团)有限责任公司市政工程分公司,安徽合肥230031

出　　处：《水利水运工程学报》2024年第1期129-137,共9页Hydro-Science and Engineering

摘　　要：目前对树根桩与预应力桩联合加固边坡的研究相对较少,对其稳定性与敏感性的分析也不够深入。以徐州奎河边坡加固工程为例,基于强度折减方法,利用FLAC3D软件建立数值模型,分析树根桩与预应力桩联合加固边坡的稳定性及桩体受力与变形情况,并与预应力桩加固、树根桩加固、不加固3种方案进行对比分析,最后通过正交试验分析树根桩与预应力桩联合加固后边坡稳定性影响因素的敏感性。结果表明,采用树根桩与预应力桩联合加固边坡时:(1)比其他加固方案的边坡水平位移与支护桩水平位移更小,安全系数更高,达到了较好的加固效果;(2)边坡潜在滑动面为绕过坡脚的经过土岩交界处的深层滑动面,边坡下滑力主要由预应力桩承担;(3)边坡安全系数对各影响因素的敏感性顺序为预应力桩边长>树根桩桩长>预应力桩桩间距>预应力桩桩长>树根桩桩间距>树根桩直径。研究结果可为类似工程设计提供参考依据。Currently,limited research exists on the joint reinforcement of slopes using root piles and prestressed piles,which is crucial for assessing stability and sensitivity.This study focuses on the Kuihe slope reinforcement project in Xuzhou.Employing the strength reduction method,a numerical model is developed using FLAC3D software to analyze the slope stability,stress,and deformation of piles.A comparative analysis is conducted among three schemes:prestressed piles,root piles,and no reinforcement.Additionally,an orthogonal test investigates the sensitivity of factors influencing slope stability after joint reinforcement.The findings reveal that the safety factor of the combined reinforcement of root piles and prestressed piles is 2.4355,lower than the horizontal displacement of the slope and supporting pile in other schemes,indicating superior reinforcement effectiveness.The potential sliding surface of the slope,when reinforced by the combination of root piles and prestressed piles,lies deep within the soil-rock junction at the slope's base,with the prestressed piles primarily bearing the sliding force.The sensitivity order of the slope safety factor to influencing factors,in the case of joint reinforcement with root piles and prestressed piles,is as follows:side length of prestressed pile>root pile length>distance between prestressed piles>length of prestressed pile>distance between root piles>diameter of root pile.These research outcomes offer valuable insights for similar engineering designs.

关 键 词：边坡 树根桩 正交试验 强度折减法 桩身内力 

分 类 号：TV871[水利工程—水利水电工程]