围桩非对称设计对耦合桩受力特征的影响分析  

Analysis of the Influence of Asymmetric Design of Surrounding Piles on the Stress Characteristics of Coupling Piles

作　　者：郑明新[1,2] 魏子坤 胡亮[1,2] 胡红萍 聂宏智 Zheng Mingxin;Wei Zikun;Hu Liang;Hu Hongping;Nie Hongzhi(College of Communication and Transportation Engineering,East China Jiaotong University,Nanchang 330013,China;State Key Laboratory of Performance Monitoring and Protecting of Rail Transit Infrastructure,East China Jiaotong University,Nanchang 330013,China;Nanchang Railway Survey and Design Institute Co.,Ltd.,Nanchang 330002,China)

机构地区：[1]华东交通大学交通运输工程学院,江西南昌330013 [2]华东交通大学轨道交通基础设施性能检测与保障国家重点实验室,江西南昌330013 [3]南昌铁路勘察设计院有限责任公司,江西南昌330002

出　　处：《华东交通大学学报》2025年第1期26-37,共12页Journal of East China Jiaotong University

基　　金：国家自然科学基金项目(51068006);江西省自然科学基金项目(20242BAB26078)。

摘　　要：针对围桩-土耦合式抗滑桩支护边坡时各围桩的受力情况有所差异等问题,以江西省某滑坡治理工程为背景,采用Midas GTS NX有限元软件建立了围桩-土耦合式抗滑桩治理模型,探讨了不同围桩长度组合下结构的内力、位移变化规律,并分析了不同配筋方式下围桩的受力变形特征。结果表明:减小中间及后排围桩的锚固比会导致前排围桩位移和内力增大,且围桩锚固比的减小会使自身所受弯矩和剪力明显减小;当后排围桩锚固比不足1/3时,滑坡推力将不能通过围桩传递给稳定地层;3种配筋方案进行对比,在达到安全要求情况下围桩统一配筋用筋量多、围桩变形小,拥有更好的治理效果和结构强度。支护荷载单一的边坡时,优先采用考虑桩身受力特征的配筋方式;在支护荷载复杂的边坡时,优先采用各排单独配筋的设计方式。Aiming at the problem that the stress of each pile is different when the pile-soil coupling anti-slide pile is used to support the slope,taking a landslide control project in Jiangxi Province as the background,the Mi-das GTS NX finite element software is used to establish the pile-soil coupling anti-slide pile treatment model.The internal force and displacement variation of the structure under different pile length combinations are dis-cussed,and the stress and deformation characteristics of the pile under different reinforcement methods are ana-lyzed.The results show that the decrease of the anchorage ratio of the middle and rear piles will lead to the in-crease of the displacement and internal force of the front pile,and the decrease of the anchorage ratio of the pile will significantly reduce the bending moment and shear force.When the anchoring ratio of the rear pile is less than 1/3,the landslide thrust will not be transmitted to the stable stratum through the pile.By comparing the three reinforcement schemes,it is found that under the condition of meeting the safety requirements,the unified reinforcement of the pile is larger,the deformation of the pile is small,and the treatment effect and structural strength are better.When supporting a slope with a single load,the reinforcement method considering the force characteristics of the pile body is preferred.When supporting slopes with complex loads,the design method of separate reinforcement in each row is preferred.

关 键 词：耦合式抗滑桩 非对称 桩身长度 配筋 

分 类 号：U215[交通运输工程—道路与铁道工程]