汪波,郭新新,王志伟,李浩彬

• 1:西南交通大学交通隧道工程教育部重点实验室
• 2:河南省交通规划设计研究院股份有限公司

摘要(Abstract)：

针对相邻隧道爆破施工中对既有裂缝病害隧道带来的不利影响,以既有新岭隧道旁拟建新隧道的具体工程为依托,在充分调研分析既有隧道裂缝病害类型及分布规律的基础上,采用数值分析方法,对不同分布部位(拱顶、拱腰、边墙)、不同扩展深度(1/4、2/4、3/4)及不同围岩级别(Ⅲ、Ⅳ、Ⅴ)下的裂缝影响进行研究。结果表明:裂缝对既有隧道二衬的影响主要集中在应力方面,对振速影响很小;既有隧道裂缝扩展越深对结构越发不利,当扩展到3/4二衬厚度,相较于完整工况,既有隧道断面最大拉应力值增加0.35 MPa,增幅达35%;裂缝部位位于临近新建隧道侧边墙处时,对结构影响最大;既有隧道所处围岩条件越差,振速和应力越大,同时裂缝处应力放大效应随围岩变差而增大,较于完整工况,最大放大倍速为1.62倍。

关键词(KeyWords)： 爆破;既有隧道;裂缝;动力响应;放大效应

Abstract:

Keywords:

基金项目(Foundation): 国家自然科学基金项目(51578456、51378434);; 国家重点研发计划(2016YFC0802210-1-1)

作者(Author): 汪波,郭新新,王志伟,李浩彬

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