基于振动台试验的基覆型边坡损伤演化规律与快速识别方法研究  

Research on Damage Evolution Law and Rapid Identification Method of Bedrock and Overburden Layer Slope Based on Shaking Table Test

作　　者：杨长卫[1] 童心豪 吴东升[1] 蔡德钩 瞿立明 YANG Changwei;TONG Xinhao;WU Dongsheng;CAI Degou;QU Liming(School of Civil Engineering,Southwest Jiaotong University,Chengdu 610031,China;Railway Engineering Research Institute,China Academy of Railway Sciences Corporation Limited,Beijing 100081,China)

机构地区：[1]西南交通大学土木工程学院,四川成都610031 [2]中国铁道科学研究院集团有限公司铁道建筑研究所,北京100081

出　　处：《铁道学报》2023年第6期123-130,共8页Journal of the China Railway Society

基　　金：国家重点研发计划(2018YFE0207100);国家自然科学基金(52078426);四川省科技计划(2020YJ0253);中铁二院工程集团有限责任公司科研项目(KYY2019145(19-20))。

摘　　要：以位于鲜水河构造带附近某边坡为原型,基于相似理论建立基覆型边坡模型并进行大型振动台试验,分析基覆型边坡表面和内部的峰值加速度(PGA)演化规律。研究发现,地震作用下PGA具有明显的趋表效应和高程效应,但输入PGA为0.7 g时,堆积体和软弱夹层的PGA、PGA放大系数均有明显降低,揭示了地震作用下基覆型边坡损伤演化规律。在此基础上,利用传递函数理论,提出基于频响函数相关系数和函数幅值的基覆型边坡损伤快速识别方法,结果表明,前者计算快捷,能够量化反映各点损伤程度,为震后基覆型边坡抗震加固提供参考;后者能识别堆积体在地震作用下由损伤到即将破坏的特征信号,从而为边坡稳定性的监测预警提供帮助。Taking a slope near the Xianshui River structural belt as a prototype,based on the similarity theory,a model of the bedrock and overburden layer slope was established and a large-scale shaking table test was carried out to analyze the evolution of the peak ground acceleration(PGA)on the surface and inside of the bedrock and overburden layer slope.It is found that PGA has obvious surface and elevation effects under the action of earthquake.However,when the input PGA is 0.7 g,the PGA and PGA amplification coefficients of the accumulation body and weak interlayer are significantly reduced,which reveals the damage evolution law of the bedrock and overburden layer slope under the action of earthquake.On this basis,the transfer function theory was used to propose a fast identification method of bedrock and overburden layer slope damage based on the correlation coefficient of frequency response function and the amplitude of frequency response function.The results show that the former is fast in calculation and can quantitatively reflect the damage degree of each point,which provides a reference for the seismic reinforcement of bedrock and overburden layer slope after earthquake.The latter can identify the characteristic signal of the bedrock and overburden layer slope from damage to imminent destruction under the action of earthquake,thus providing help for monitoring and early warning of slope stability.

关 键 词：基覆型边坡 振动台试验 地震 传递函数 PGA 

分 类 号：U213.13[交通运输工程—道路与铁道工程]