柳之森

• 1:中铁十四局集团有限公司

摘要(Abstract)：

结合武汉地铁5号线穿越黄鹤楼公园项目现场监测数据，分析了地铁隧道下穿人防洞室、京广铁路、黄鹤楼、圣像宝塔的峰值振速、主频分布特征，并且利用FLAC3D软件分析了人防洞室结构受上台阶爆破影响的振动速度衰减规律、位移与应力响应规律，现场监测结果与数值模拟结果基本吻合。研究结果表明：受爆破影响比较接近控制值的是人防工程和胜像宝塔，爆破对钢筋混凝土结构的黄鹤楼影响较小，既有铁路受到的爆破振动不超过0.9 cm/s,小于铁路路基振动控制值2 cm/s,且随着隧道爆破的推进，爆破振动对铁路的影响也将越来越小。各测点垂直向峰值振速最大，各测点垂向震动的主频主要分布在低中频区域，频率范围10～100 Hz,主要集中在20～65 Hz。人防洞室结构各部位峰值振速衰减不同，峰值振速PPV随爆源距增加而减小，最大峰值出现在y=4 m附近，并且PPV在已开挖区域衰减更快。爆破振动对人防结构的位移响应在可控范围内，最大位移、最大主应力集中在迎爆面拱脚B处。结合峰值振速与最大主应力拟合公式，得出了人防结构峰值振速安全控制值。

关键词(KeyWords)： 数值模拟;爆破振动;地铁隧道;峰值振速

Abstract:

Keywords:

基金项目(Foundation):

作者(Author): 柳之森

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