基于希尔伯特边际谱理论的含隧道滑坡震动破坏模式研究——以隧道正交下穿主滑方向滑体为例  

Vibration Failure Mode of Tunnel Crossing Landslide Based on Hilbert′s Marginal Spectrum Theory:A Case Study of Tunnel Orthogonal Downward Crossing Slide Body

作　　者：孙浩 曹生慧 吴红刚 张克宏 黄新宇 SUN Hao;CAO Shenghui;WU Honggang;ZHANG Kehong;HUANG Xinyu(School of Civil Engineering and Architecture,Southwest University of Science and Technology,Mianyang 621000,Sichuan,China;China Northwest Research Institute Co.,Ltd.of CREC,Lanzhou 730070,Gansu,China;Lanxin Railway Ganqing Co.,Ltd.,Lanzhou 730000,Gansu,China;China Railway 11th Bureau Group Corporation Limited,Wuhan 811300,Hubei,China)

机构地区：[1]西南科技大学土木工程与建筑学院,四川绵阳621000 [2]中铁西北科学研究院有限公司,甘肃兰州730070 [3]兰新铁路甘青有限公司,甘肃兰州730000 [4]中铁十一局集团有限公司,湖北武汉811300

出　　处：《隧道建设（中英文）》2023年第S01期257-270,共14页Tunnel Construction

基　　金：国家重点研发计划(2018YFC1504901);甘肃省自然科学基金(21JR7RA738);中铁九局集团有限公司科技发展项目(DLF-ML-JSFW-2021-09);中铁十一局集团有限公司科技开发项目(202207)。

摘　　要：为探究地震作用下含隧道滑坡体的破坏模式,以正交下穿滑体主滑方向为例进行振动台试验,通过测试得到滑坡体内不同位置的加速度时程曲线,基于希尔伯特边际谱理论,获取不同位置测点的边际谱,并提取各测点边际谱峰值和特征频率,揭示隧道正交下穿滑体滑坡的破坏模式。结果表明:1)在不同强度地震作用下,基岩内地震能量有序传递,并不出现地震损伤,滑坡体内中上部坡体和下部坡体率先出现地震能量不能完整传递,出现地震损伤。2)隧道的存在劣化了上部坡体的力学环境,使得中下部坡体内隧道顶部T16测点在低能量输入下仍出现破坏。3)隧道正交下穿滑体主滑方向的震动破坏模式表现为崩落—拉裂—滑移破坏。To investigate the failure mode of tunnel crossing landslide body under earthquake action,a vibration platform test is conducted to obtain the acceleration time history curves of different positions in landslide body.Based on Hilbert′s marginal spectrum theory,the marginal spectrum of measuring points at different locations is obtained,and the peak value and characteristic frequency of each measuring point are extracted to reveal the failure mode of tunnel orthogonally crossing slide body.The results show the following:(1)When earthquakes occur at all levels,the orderly transfer of seismic energy in the bedrock does not cause seismic damage,while the incomplete transfer of seismic energy occurs first in the middle,upper,and lower slopes of the landslide.(2)The existence of the tunnel degrades the mechanical environment of the upper slope,resulting in the failure of the T16 measuring point at the top of the tunnel in the middle and lower slope under low energy input.(3)The vibration failure mode of the main sliding direction of the tunnel crossing slide body is collapse-tesion-slide failure.

关 键 词：HHT变换 边际谱 正交型隧道-滑坡体系 振动台试验 破坏模式 

分 类 号：U45[建筑科学—桥梁与隧道工程]