摘要
高烈度区坡体病害地段山岭隧道面临高度非线性、复杂时变性、多元不确定性地震响应难题,传统分析手段难以有效应对,“模式-数据”双驱动融合对隧道衬砌损伤性态准确评价至关重要。开展隧道横穿主滑面系统地震损伤和动力响应特性振动台试验,提出振动模型边界效应和系统动力特性评价方法。基于模型场地土损伤状态,联合希尔伯特-黄变换(HHT)与信息熵理论,提出一种基于边际谱熵值的模型场地土破坏“模式-数据”双驱动融合评价方法。利用EMD分解和HHT频带能量谱,提出一种衬砌结构EMD能量损伤指数“模式-数据”双驱动融合评价方法。经震后模型场地土和衬砌损伤状态测试,印证边际谱熵值破坏模式评价方法与EMD能量损伤参数的合理性。结果表明:隧道横穿主滑面系统整体呈后缘沉降挤压-中部滑移拉动-前缘剪出鼓胀的失稳模式。基于边际谱熵值揭示的坡体破坏过程、滑面位置与振动台试验再现的破坏特征基本一致,证明双驱动融合方法的可靠性。模型场地土HHT能量谱频率主要集中在0~25 Hz。衬砌HHT能量谱峰值时刻(18.07 s)较模型场地土滞后,且不同特征部位的瞬时频率不同。损伤指数分布与衬砌特征部位空间位置相关,激振强度0.4g时,EMD损伤指数均大于90%。经震后模型检验,根据EMD能量损伤指数突变情况能定位衬砌结构损伤部位及判断损伤程度。为高烈度区坡体病害地段隧道建造与运维过程中监测分析、损伤定量评价等提供一种新的视角和范式。
The mountain tunnel in the slope disease area of high intensity area is faced with the difficult problem of highly nonlinear,complex time-varying and multi-uncertainty earthquake response,which is difficult to be effectively dealt with by traditional analysis methods.The“model-data”dual-drive fusion is very important for efficient evaluation of lining damage behavior.In this paper,shaking table tests are carried out on the seismic damage and dynamic response characteristics of the tunnel crossing the main sliding surface,and the boundary effect of the vibration model and the evaluation method of the system dynamic characteristics are proposed.Based on the damage state of the model site soil,a“model-data”dual-drive fusion failure mode evaluation method based on marginal spectrum entropy is proposed combined with Hilbert-Huang transform(HHT)and information entropy theory.Based on EMD decomposition and HHT band energy spectrum,a“model-data”dual-drive fusion evaluation method for EMD energy damage index of lining is proposed.The rationality of the damage model evaluation method and EMD energy damage parameters is verified by testing the damage state of the site soil and lining after the earthquake.The results show that the overall failure mode of tunnel crossing sliding surface is the trailing edge settlement,the middle slip,and the leading-edge shear bulge.The slope failure process and slide surface location based on marginal spectrum entropy are basically consistent with the characteristics of slope failure process reproduced by shaking table test,which proves the reliability of the dual-drive fusion method.The HHT energy spectrum frequency of model site soil is mainly concentrated in 0-25 Hz.The peak time of HHT energy spectrum of lining(18.07 s)lags behind that of model site soil,and the instantaneous frequency of different characteristic parts is different.The distribution of the damage index is related to the spatial location of the lining characteristic parts,and the EMD energy damage index is more than 90%under the excitation strength of 0.4 g.Verified by the lining model,it shows that the damage location can be detected based on EMD energy damage index,and the damage degree can be roughly judged according to the sudden change of damage index.It provides a new perspective and paradigm to solve the problems of monitoring analysis and damage quantitative evaluation during tunnel construction and operation in slope disease section of high intensity area.
作者
牌立芳
吴红刚
梁柯鑫
周平
PAI Lifang;WU Honggang;LIANG Kexin;ZHOU Ping(School of Civil Engineering,Lanzhou Jiaotong University,Lanzhou,Gansu 730000,China;China Northwest Research Institute Co.Ltd.of CREC,Lanzhou,Gansu 730000,China;China Railway Academy Co.,Ltd.,Chengdu,Sichuan 610032,China;Western Environmental Geotechnical and Site Rehabilitation Technology Engineering Laboratory,Lanzhou,Gansu730000,China;China Railway Shanghai Design Institute Group Corporation Limited,Shanghai 200070,China;School of Earth Science and Environmental Engineering,Southwest Jiaotong University,Chengdu,Sichuan 610000,China)
出处
《岩石力学与工程学报》
EI
CAS
CSCD
北大核心
2024年第S02期3841-3860,共20页
Chinese Journal of Rock Mechanics and Engineering
基金
甘肃省重点研发计划-工业类项目资助(23YFGA0028)
中国中铁股份有限公司科技研究开发计划(2022-重大专项-07)
兰州交通大学-西南交通大学联合创新基金项目(LH2023012)
关键词
隧道工程
隧道穿越滑面
地震作用
“成灾模式-监测数据”双驱动
信息熵理论
希尔伯特-黄变换
损伤评价
tunnel engineering
tunnel crossing sliding surface
earthquake action
“disaster model-monitoring data”dual-drive
information entropy theory
Hilbert-Huang transform(HHT)
damage assessment
作者简介
牌立芳(1992-),男,博士,2016年毕业于聊城大学土木工程专业,现任讲师,主要从事高烈度区交通隧道-滑坡灾变防控理论与技术方面的研究工作。E-mail:13465099791@163.com;通讯作者:吴红刚(1983-),男,博士,现任高级工程师。E-mail:271462550@qq.com
