寒区高边坡机场坡顶土体振动响应研究  

Research on Dynamic Response of Top Soil on the High-Filled Slope of Cold Region Airport

作　　者：刘国光[1,2,3] 裴磊洋 牛富俊 LIU Guoguang;PEI Leiyang;NIU Fujun(College of Transportation Science and Engineering,Civil Aviation University of China Tianjin,300300,China;State Key Laboratory of Frozen Soils Engineering,Northwest Institute of Eco-Environment and Resources,Chinese Academy of Sciences Lanzhou,730000,China;University of Chinese Academy of Sciences Beijing,100039,China;School of Civil Engineering,Sun Yat-sen University Guangzhou,510275,China)

机构地区：[1]中国民航大学交通科学与工程学院,天津300300 [2]中国科学院西北生态环境资源研究院冻土工程国家重点实验室,兰州730000 [3]中国科学院大学,北京100039 [4]中山大学土木工程学院,广州510275

出　　处：《振动．测试与诊断》2023年第5期938-944,1039,共8页Journal of Vibration,Measurement & Diagnosis

基　　金：国家重点研发计划资助项目(2020YFB1600100);天津市教委科研资助项目(2018KJ243)。

摘　　要：为解决寒区高填方机场坡顶土体安全问题,通过引入土体并联振动模型和快速傅里叶变换(fast Fourier transform,简称FFT),分析了振动台试验中冻结土样振动响应在时域和频域内的变化规律,提出了基于响应频率的冻结土样动力稳定性分析方法。研究表明:冻结土样在融化过程中的加速度增长比R_(a)、频率和频率增长比R_(f)均明显变大,但加速度幅值变化规律不明显;土样含水率越高,融化时间越短,R_(f)越大,完全融化后的响应频率值越大,但对加速度放大系数影响不大;在高温冻结阶段,R_(f)出现突变但R_(a)变化不显著,表明在频域中分析冻结土样振动响应变化比时域分析中灵敏度更高。振动台试验结果验证了土体振动并联模型的可靠性,对寒区高填方机场坡顶土体安全监测具有一定参考价值。In order to solve the safety issues of top soil on the airport high-filled slope in cold regions,parallel vibration model and fast Fourier transform(FFT)are introduced into the analysis on the dynamic behavior of frozen soil samples in temporal domain and frequency domain via the shaking-table experiment.By which,a novel dynamic stability analysis method is proposed by investigating the response frequency.The result shows that there is significant increase in the ratio of acceleration growth(R_(a)),frequency and the ratio of frequency growth(Rf)during thawing process.However,the variation trend of acceleration amplitude is not so obvious.With higher mass water contents,the thawing process is shorter,Rf is greater and response frequency is higher after completely thawed.Meanwhile,the acceleration amplification coefficient is less influenced by mass water contents.During the high-temperature freezing period,there is a mutation of R_(f)while R_(a)still remains unchanged.It indicates that the analysis on dynamic behavior of frozen soil samples is more sensitive in frequency domain compared with the temporal domain.The outcomes of shaking table experiment also prove the reliability of the proposed parallel vibration model of soil.It is helpful for the stability monitoring of high-filled slope in the cold regions.

关 键 词：岩土工程 寒区工程 高填方边坡 动力响应特征 升温作用 振动台试验 

分 类 号：TH82[机械工程—仪器科学与技术] TU435[机械工程—精密仪器及机械]