摘要
当桥梁桩基设置在滑坡上时,常采用抗滑桩作为支挡结构,抗滑桩和桥梁桩基之间存在着相互作用。以子-姚高速崖坬沟3号大桥为研究背景,对桥梁桩基及抗滑桩的桩顶位移及桩侧土压力进行监测,分析抗滑桩与桥梁桩基相对位置改变对桥梁桩基受力变形的影响。同时,基于ABAQUS软件分析前后排抗滑桩不同埋置位置下抗滑桩对坡脚桥梁桩基及坡中桥梁桩基的影响。现场监测数据表明抗滑桩与桥梁桩基相对位置对桥梁桩基水平位移及桩侧土压力均有影响,在抗滑桩距离桥基8 m和4 m时,间距8 m加固效果更佳。通过数值模拟,发现后排抗滑桩距离桥梁桩基过远或过近均对桥梁桩基加固效果有限,抗滑桩加固桥梁桩基存在一个最佳距离,对于坡脚桥梁桩基抗滑桩加固最佳距离为3h~5h(h为抗滑桩沿滑坡走向的截面长度),对于坡中桩抗滑桩加固最佳距离为2h~4h,而前排抗滑桩离桥基越近,其加固效果越好。如果桥梁桩基在坡体中上部时,桥梁桩基前部土体较多可能会形成牵引式滑坡,需设置前排抗滑桩进行支护,综合考虑确定合理的加固位置。
When the bridge pile foundation is set on the landslide,anti-slide pile is often used as the supporting structure of the bridge foundation.At present,the bridge foundation design of landslide section generally does not consider the action of horizontal load,which is usually borne by the design of anti-slide pile.However,there is interaction between the anti-slide pile and bridge pile foundation.The Yawagou#3 birdge at the Ziyao High-speed was taken as the research background,the pile tip displacement and soil pressure of bridge pile were monitored,and the influence of relative position change of anti-slide pile and bridge pile on stress and deformation of bridge pile was analyzed.Based on the field monitoring and numerical simulation,the influence of anti-slide piles at different buried positions of front and rear anti-slide piles on the foundation of bridge at the foot of slope and the foundation of bridge in slope was discussed.The field monitoring data show that the relative position of anti slide pile and bridge pile foundation has an impact on the horizontal displacement of bridge pile foundation and pile side earth pressure.When the anti-slide pile is 8 m and 4 m away from the bridge foundation,the reinforcement effect with a spacing of 8 m is better.Through numerical simulation,it is found that the reinforcement effect of bridge pile foundation is limited if the rear anti slide pile is too far or too close to the bridge pile foundation,and there is an optimal distance for anti slide pile to strengthen bridge pile foundation.For the bridge pile foundation at the slope toe,the best reinforcement distance of anti slide pile is 3h~5h(h is the section length of the anti slide pile along the landslide trend).For the pile in the middle of the slope,the best distance for anti slide pile reinforcement is 2h~4h,and the closer the front anti slide pile is to the bridge foundation,the better the reinforcement effect.If the bridge pile foundation is in the middle and upper part of the slope,there is more soil in front
作者
解瑞松
巩悦
韩飞
张蛟
尹培杰
晏长根
XIE Rui-song;GONG Yue;HAN Fei;ZHANG Jiao;YIN Pei-jie;YAN Chang-gen(Shaanxi Communications Construction Group Corporation, Xi'an 710075, China;College of Highway, Chang'an University, Xi'an 710064, China)
出处
《科学技术与工程》
北大核心
2022年第9期3665-3673,共9页
Science Technology and Engineering
基金
国家重大科研仪器研制项目(41927806)
企事业委托项目(18-06)。
关键词
桥梁桩基
抗滑桩
现场监测
数值模拟
bridge pile foundation
anti-slide pile
on-site monitoring
numerical simulation
