摘要
为了研究高速列车运行荷载作用下黄土斜坡场地动力响应,评价高速列车运行荷载作用对黄土斜坡场地稳定性的影响,选择宝兰客专路堤段阶梯式黄土斜坡场地进行现场振动测试,从时域、频域多个方面分析了列车荷载作用下黄土斜坡场地的振动特性,进而分析黄土斜坡场地效应。研究结果表明:不同速度的列车通过时路堤段阶梯式黄土斜坡场地在不同的阶梯田边缘位置会出现加速度和振动加速度级反弹增大的现象;各个测点的振动频率主要集中在10~80 Hz,各个测点的主频分布明显不同,列车以不同速度经过同一测点时,其振动频率分布也存在着很大的差异。
In order to study the dynamic response of loess slopes under high-speed train loads and evaluate their influence on the stability of the loess slopes,the vibration characteristics of loess slope site under train loads are analyzed in time domain and frequency domain,then the site effect of the loess slopes is analyzed.The results show that the acceleration and vibration acceleration increase in different stepped loess slope sites when different speed trains pass.The vibration frequency at each measuring point is mainly concentrated in the range of 10~80 Hz,the distribution of the main frequency at each measuring point is obviously different,and that when the train passes through the same measuring point at different speeds is also very different.The time-frequency curve is stable during 2~5 s and no abrupt change occurs,which indicates that the train runs at uniform speed.The spectral curve shows a abrupt peak between 0~2 s and 5~7 s,which indicates that the running state of the train has changed.
作者
严武建
郑海忠
车爱兰
王平
田欣欣
YAN Wu-jian;ZHENG Hai-zhong;CHE Ai-lan;WANG Ping;TIAN Xin-xin(Key Laboratory of Loess Earthquake Engineering,CEA,Lanzhou 730000,China;Geotechnical Disaster Prevention Engineering Technology Research Center of Gansu Province,Lanzhou 730000,China;School of Naval Architecture,Ocean&Civil Engineering,Shanghai Jiao Tong University,Shanghai 200240,China)
出处
《岩土工程学报》
EI
CAS
CSCD
北大核心
2021年第S01期149-154,共6页
Chinese Journal of Geotechnical Engineering
基金
中国地震局地震预测研究所基本科研业务费专项项目(2014IESLZ01)
中国地震局工程力学研究所基本科研业务费专项资助项目(2020EEEVL0304)
国家自然科学基金项目(41472297,U1939209)
作者简介
严武建(1980—),男,副研究员,博士,主要从事岩土地震工程与有限元模拟等方面的研究。E-mail:yanwj1980@126.com;通信作者:郑海忠,Email:zhenghzho@126.com
