摘要
地铁运营所产的振动噪声问题一直是其发展过程中亟待解决的难题,不同减振措施、不同地质条件下轨道结构产生的振动波传播及衰减规律也存在较大差异,为探究以富水砂卵石为主的地铁不同减振轨道结构源强及振动随距离衰减的特性,文章对成都地铁GJ-Ⅲ减振扣件、钢弹簧浮置板、一般轨道结构和浮轨式扣件4种轨道结构形式隧道壁振动源强和地面振动响应进行现场同步测试,并从频域、时频域及地面Z振级等方面对获得的数据进行分析。结果表明:GJ-Ⅲ减振扣件、浮轨式扣件和钢弹簧浮置板3种减振轨道形式均可有效降低隧道壁源强和地面振动,三者减振效果钢弹簧浮置板大于浮轨式扣件大于GJ-Ⅲ减振扣件;环境振动的主频在经过土体介质后一般不会发生改变,轨道结构形式是决定环境振动频域分布的主要因素,地面环境振动随传播距离的衰减主要体现在各组断面的主频上而加强区测点的频域加强频带为50~80 Hz;4 Hz以下的低频振动和50 Hz以上的高频振动经过土层介质后均有较为明显的衰减。
The issue of vibration and noise generated by metro operation has always been a dificult problem to be solved in its development,the propagation and attenuation regularities of vibration waves generated by track structures under different damping measures and different geological conditions also have great differences;in order to investigate the characteristics of source strength and vibration attenuation with distance of different vibration damping track structures in water-rich sandy pebbles-based metro,this article carries out on-site simultaneous testing of the source strength of tunnel wall vibration and ground vibration response of four types of track structures,namely,the GJ-Ⅲ vibration damping fasteners,the steel-spring floating slab,the common track structure and the floating-rail structure fasteners in the Chengdu metro,and analyzes the obtained data in terms of the frequency domain,the time-frequency domain and ground Z-vibrational level.The results show that the three kinds of vibration damping track forms of GJ-Ⅲ damping fastener,floating-rail structure fasteners and high-grade steel-spring floating slab are all capable of effectively reducing the tunnel wall source strength and ground vibration,and their damping effects are steel-spring floating slab>floating-rail structure fasteners>GJ-Ⅱ damping fastener;the main frequency of environmental vibration will not change after passing through the soil medium,the form of track structure is the main factor that determines the frequency distribution of environmental vibration,the attenuation of ground environmental vibration with the propagation distance is mainly reflected in the main frequency of each group of sections,and the frequency enhancement band of the strengthened area is 50~80 Hz;both low frequency vibration below 4 Hz and high frequency vibration above 50 Hz have obvious attenuation after passing through soil layer medium.
作者
程云妍
赵月
王跃宗
刘毅
Cheng Yunyan;Zhao Yue;Wang Yuezong
出处
《现代城市轨道交通》
2023年第10期67-74,共8页
Modern Urban Transit
关键词
地铁
富水砂卵石地层
减振降噪
振动源强
振动衰减
试验研究
metro
water-rich sandy pebble stratum
vibration and noise reduction
vibration source strength
vibration attenuation
experimental study
