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工程力学  2013 

轨道交通地表振动局部放大现象成因分析

DOI: 10.6052/j.issn.1000-4750.2011.12.0836, PP. 275-280

Keywords: 轨道交通,振动放大区,格林函数,落锤试验,波动衰减,单频振动

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Abstract:

为研究轨道交通振动产生地表局部放大现象原因,利用地表落锤试验和半空间位移格林函数解析解,分析了振源位于地面和地下两种情况下单频振动的地表响应传播规律。结果表明:1)当振源位于地面时,单一频率的地表振动响应幅值随距离呈现波浪形衰减,波动间隔与其自身频率相关。地表体波和瑞利波衰减速度不同而引起的振动叠加效应是造成上述现象的主要原因。2)当振源埋置于地下时,单一频率的地表振动响应将在距振源与埋深大致相当的近场处产生一个明显的波峰或波谷,在远场衰减规律与振源位于地面的情况近似。

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