基于振动试验台的岩质边坡地震响应时频分析  

Time-Frequency Analysis of Seismic Response of Rock Slope Based on Shaking Test Table

作　　者：曹科[1] CAO Ke(China Railway 18th Bureau Group Co.Ltd.,Tianjin 300222,China)

机构地区：[1]中铁十八局集团有限公司,天津300222

出　　处：《铁道建筑技术》2025年第2期197-200,213,共5页Railway Construction Technology

基　　金：中铁十八局集团有限公司科技研究开发计划项目(G18-08)。

摘　　要：为研究岩质边坡在动力作用下破坏机理,以某边坡为原型进行动力响应分析试验。通过大比例尺非均质岩质边坡振动台试验,获取边坡模型在不同波形下的不同部位位移响应、土压力响应和加速度响应,采用希尔伯特黄变换进行时频分析。试验结果表明:岩质边坡可分为弹性变形阶段、塑性变形阶段、破坏阶段三个失稳阶段。边坡模型具有鞭梢效应,对10 Hz的动力响应要明显高于5 Hz和EL Centro波,在动力作用下呈现随震级放大效应;坡肩与坡腰响应波的高能量频带分布范围差异是坡肩剪切带形成的诱因;较完整碎裂岩土的响应波频率分布范围更高,故可根据频率分布范围进行坡体损伤识别及破碎程度分类。In order to study the failure mechanism of rock slope under dynamic action,a certain slope is taken as a prototype to conduct dynamic response analysis test.Through the shaking table test of large-scale heterogeneous rock slope,the displacement,the soil pressure and the acceleration response at different positions of the slope model are obtained,and the Hilbert-Huang transform is used for time-frequency analysis.The test results show that the rock slope is divided into three instability stages:elastic deformation stage,plastic deformation stage and failure stage.The slope model has a whipping effect,and the dynamic response to 10Hz is significantly higher than that to 5Hz and EL Centro wave,and there is a magnitude amplification effect under the dynamic action.The difference in the distribution range of the high energy frequency band of the response wave between the slope shoulder and the slope waist is the inducement for the formation of shear band at the slope shoulder.The frequency distribution range of response waves in more complete fractured rock and soil is higher.According to the frequency distribution range,damage identification and fragmentation degree classification of slope can be carried out.

关 键 词：边坡 振动台 PGA 固有频率 时频分析 希尔伯特黄变换 

分 类 号：P642.2[天文地球—工程地质学] U213.13[天文地球—地质矿产勘探]