颜天成,张庆彬,陈敏

• 1:长沙理工大学土木工程学院
• 2:张家界市交通运输综合行政执法支队

摘要(Abstract)：

以赣深高铁一级风险隧道——伯公坳1号隧道为背景，研究新建隧道爆破施工时，近接既有隧道衬砌结构的动力响应。采用Ansys/Ls-dyna有限元软件建立试验段数值模型，将现场实测振速与模型计算振速作对比，反演围岩介质参数，验证了数值模拟的可靠性。以试验段参数为基础，进一步构建了两隧道交叉段的数值模型，由此分析交叉段既有隧道衬砌结构的振动衰减规律，提出交叉点处最不利工况的减振措施。研究结果表明：既有隧道拱顶振速最大，底板振速最小；交叉点前后方30 m范围内，拱顶振速约为迎爆侧边墙振速的2.0～2.3倍，1.6 cm/s的控制振速是针对既有隧道全断面而言的，因此其边墙部位的监测预警值应取为0.8 cm/s;掏槽孔反向起爆时，大部分的爆炸能量向未开挖区域传递，所以既有隧道对应于新建隧道已开挖区域的振速衰减速率比未开挖区域的要大；试验段的爆破方案不再适用于交叉影响段，在将进尺缩短至1.0 m,掏槽孔药量减小至9.86 kg后，能够在兼顾工效和爆破影响的前提下，将既有隧道二衬振速控制在安全标准以内。

关键词(KeyWords)： 隧道工程;交叉隧道;动力响应;数值模拟;降振措施;振速控制

Abstract:

Keywords:

基金项目(Foundation): 国家自然科学基金(编号：51508038);; 长沙理工大学研究生实践创新项目(编号：SJCX202026)

作者(Author): 颜天成,张庆彬,陈敏

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