徐昊,何如,李栋伟,季安,何锦,代四龙

• 1:东华理工大学土木与建筑工程学院
• 2:中核华泰建设有限公司

摘要(Abstract)：

初期支护是隧道施工阶段的主要承力结构，爆破施工动力扰动下初期支护的响应规律及安全控制对确保隧道安全快速施工有着重要意义。为研究预留核心土法爆破开挖影响下软岩隧道初期支护的动力响应特征及其安全控制，以林场隧道爆破施工为工程背景，依据隧道初期支护现场爆破振动监测结果，利用ANSYS/LSDYNA建立三维有限元数值计算模型，结合预留核心土法爆破作业特点，研究了两个不同距离爆源同时作用下隧道初期支护的应力分布特征，利用萨道夫斯基经验公式获得了预留核心土法爆破振动传播衰减规律，提出了以应力为控制标准的两侧下台阶同时起爆条件下隧道初期支护的爆破振动速度安全判据。结果表明：不同于全断面法和台阶法爆破，预留核心土法两侧下台阶同时起爆时，最大振动速度出现于隧道初期支护拱脚处，而非隧道底板或拱顶；仰拱未回填区域的存在显著影响爆破应力波传播路径，相较于右侧拱脚，隧道初期支护左侧拱脚处的振动速度更大，且随距离增加而衰减的更明显；初期支护结构稳定性受拉应力控制，最大拉应力及剪应力出现于隧道左侧拱脚处，最大拉应力为7.544 MPa,最大的剪应力为2.78 MPa,均超过规范允许值；根据建立的应力-振速线性关系，提出基于极限强度的隧道初期支护爆破振动安全判据；在林场隧道爆破条件下初期支护的爆破振速安全阈值为10 cm/s。研究成果为隧道爆破施工设计以及安全控制提供理论研究基础。

关键词(KeyWords)： 爆破振动;初期支护;质点峰值振速;动力响应;安全判据

Abstract:

Keywords:

基金项目(Foundation): 江西省地质环境与地下空间工程研究中心开放基金项目(JXDHJJ2022-005);; 国家自然科学基金项目(42061011);; 东华理工大学博士科研启动基金项目(DHBK2019236);东华理工大学研究生创新基金(YC2022-s611)~~

作者(Author): 徐昊,何如,李栋伟,季安,何锦,代四龙

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