地震作用下多锚点圆形抗滑桩动力响应特性研究
Research on dynamic response characteristics of multi-anchor circular anti-slide pile under earthquake
杨羽 1韦洪 2余浩 1苗超杰 1吴红刚 3尹威江3
作者信息
- 1. 重庆渝湘复线高速公路有限公司,重庆 401121
- 2. 中国矿业大学(北京)力学与土木工程学院,北京 100083;中国矿业大学(北京)隧道工程灾变防控与智能建养全国重点实验室,北京 100083;中铁西北科学研究院有限公司,甘肃 兰州 730070
- 3. 中铁西北科学研究院有限公司,甘肃 兰州 730070
- 折叠
摘要
为探讨多锚点圆形抗滑桩(以下简称多锚点圆桩)加固滑坡的动力响应特性,本研究以概化地质模型为案例开展振动台试验,测试得到不同地震强度作用下多锚点圆桩的加速度及动态土压力等多属性数据信息.阐明了坡体的宏观灾变演化过程及加速度的区域性响应特性.基于桩体与锚索结构的受力响应数据对多锚点圆桩在高烈度地区的实际应用提出了建议.研究结果表明:在地震力、滑动面和桩体反力的耦合互馈效应影响下,坡体不同部位的灾变力学机制和加速度响应存在显著区别.超过0.2 g地震作用下,桩体加速度放大系数(MPGA)随地震强度增加而呈降低趋势,锚索结构极大地降低了抗滑桩发生倾倒或折断风险.实际工程中锚索结构应采用渐进式补偿设计原则,同时合理分配桩锚结构的抗力可充分发挥其加固性能.
Abstract
To explore the dynamic response characteristics of multi-anchor circular anti-slide piles(hereinafter referred to as multi-anchor circular piles)to reinforce landslide,this study carried out shaking table tests with a generalized geological model as a case,and obtained multi-attribute data such as acceleration and dynamic earth pressure of multi-anchor circular piles,under the action of different seismic intensities.The macroscopic catastrophic evolution process of the slope and the regional response characteristics of the acceleration are elucidated.Recommendations are put forward for the practical application of multi-anchor circular piles in high intensity areas based on the force response data of pile and anchor cable structures.The results show that there are significant differences in the catastrophic mechanical mechanism and acceleration response of different parts of the slope under the influence of the coupling and mutual feedback effect of seismic force,sliding surface and pile reaction force.Under the earthquake action of more than 0.2 g,the acceleration amplification factor(MPGA)of the pile decreases with the increase of seismic intensity,and the anchor cable structure greatly reduces the risk of toppling or breaking of the anti-slide pile.In practical engineering,the anchor cable structure should adopt the progressive compensation design principle,and the reasonable distribution of the resistance of the pile anchor structure can give full play to its reinforcement performance.
关键词
多锚点圆桩/地震响应/振动台试验/滑坡Key words
multi-anchor circular piles/seismic response/shaking table test/landslide引用本文复制引用
基金项目
甘肃省青年科技基金项目(22JR5RA777)
重庆渝湘复线高速公路有限公司科技开发项目(CQJT2022ZC20)
出版年
2024
NETL
NSTL
万方数据