不同布锚角度锚索抗滑桩抗震性能的离心振动台试验对比  

Comparative tests on seismic performance of anti-slide piles with prestressed anchor cables with different angles

作　　者：王宇 郑桐[1,2] 孙锐 齐文浩[1,2] 李领贵 程阳[1,2] 张一鸣 WANG Yu;ZHENG Tong;SUN Rui;QI Wenhao;LI Linggui;CHENG Yang;ZHANG Yiming(Key Laboratory of Earthquake Engineering and Engineering Vibration,Institute of Engineering Mechanics,China Earthquake Administration,Harbin 150080,China;Key Laboratory of Earthquake Disaster Mitigation,Ministry of Emergency Management,Harbin 150080,China;No.5 Geological and Mineral Survey Institute of Qinghai Province,Xining 810028,China)

机构地区：[1]中国地震局工程力学研究所地震工程与工程振动重点实验室,黑龙江哈尔滨150080 [2]地震灾害防治应急管理部重点实验室,黑龙江哈尔滨150080 [3]青海省第五地质勘察院,青海西宁810028

出　　处：《岩土工程学报》2023年第S02期110-115,共6页Chinese Journal of Geotechnical Engineering

基　　金：中国地震局工程力学研究所基本科研业务费专项项目(2020C02,2020C04,2019B10);国家自然科学基金项目(51808515,41172293);黑龙江省自然科学基金联合引导项目(LH2020E020)。

摘　　要：预应力锚索是预应力锚索抗滑桩的重要组成部件,但其布设角度对预应力锚索抗滑桩抗震性能的影响尚不清晰。鉴于此,设计并完成了考虑锚索水平布设和倾斜布设的两组离心振动台模型试验,对比分析了不同布锚角度时坡体地震变形和加速度放大特征以及桩-锚结构的受力特性,揭示了布锚角度变化对锚索抗滑桩-坡体体系抗震性能的影响规律。结果表明,不同布锚角度时锚索锚固点附近坡体均存在加速度异常放大现象,放大系数随输入地震动强度增加而增大;倾斜布锚时坡体沉降幅度和加速度放大程度明显减小;倾斜布锚有利于改善桩身的地震受力,桩身峰值动弯矩和动土压力相比水平布锚时显著降低;倾斜布锚可以有效减缓锚索内力的增长,降低桩-锚-坡体体系地震失效的风险。The prestressed anchor cable is an important component of the anti-slide pile of prestressed anchor cable,but the influences of its arrangement angle on the seismic performance of the anti-slide pile of prestressed anchor cable is not yet clear.To this end,a series of centrifugal model tests considering the horizontal and inclined layout of anchor cables are designed and completed.The seismic deformation and acceleration amplification characteristics of the slope are compared and analyzed under different arrangement angles of anchor cable,as well as the stress characteristics of the pile-anchor structure.It is revealed the influences of arrangement angle of anchor cable change the seismic seismic performance of the anti-slide pile of prestressed anchor cable-slope system.The results show that there is an abnormal amplification phenomenon of acceleration near the anchor point of the anchor cable under different arrangement angles of anchor cable,and the amplification coefficient increases with the increase of input seismic intensity.The settlement amplitude and acceleration amplification of the slope are significantly reduced when the inclined anchor placement is applied.The inclined anchor placement is beneficial for improving the seismic stress on the pile,and the peak dynamic bending moment and dynamic soil pressure of the pile are significantly reduced compared to those under horizontal anchor placement.The inclined anchoring method can effectively slow down the growth of internal forces in anchor cables and reduce the risk of seismic failure in the pile-anchor-slope system.

关 键 词：地震滑坡 预应力锚索抗滑桩 离心机试验 地震响应 布锚角度 

分 类 号：TU43[建筑科学—岩土工程]