李小帅,高文学,宿利平,张小军,胡宇,薛睿

• 1:北京工业大学城市建设学部
• 2:北京市政路桥股份有限公司

摘要(Abstract)：

为了研究爆破荷载作用下小净距隧道中夹岩区的动力稳定性问题，依托小龙门隧道爆破工程，开展了现场爆破振动监测试验。通过改进的变分模态分解(variational mode decomposition, VMD)与多尺度排列熵(multi-scale permutation entropy, MPE)算法对爆破振动信号进行消噪处理，基于此分析了掏槽孔与周边孔爆破在后行洞左拱腰(非中夹岩区)、右拱腰(中夹岩区)中产生的振动特征差异。结果表明：采用改进的自适应VMD-MPE算法可以有效消除振动信号中的噪声，并降低了主观决策的影响；此外，相对于非中夹岩区，中夹岩对爆破振动具有明显的放大效应，其质点峰值振速明显大于非中夹岩区，但中夹岩区的振动衰减速度更快；同时，通过对比非中夹岩区与中夹岩区各测点振动频率特征可以发现，中夹岩区小于40 Hz的低频振动能量占比较大，更易引起支护结构的共振，发生损伤与破坏的风险更高，应重点关注；受“转角削弱”作用以及地震波传播路径的影响，在比例距离SD小于等于11.57 m·kg~(1/3)范围内，周边孔爆破在掌子面后方围岩中产生的振速大于掏槽孔。

关键词(KeyWords)： 中夹岩;小净距隧道;爆破振动效应;变分模态分解;多尺度排列熵

Abstract:

Keywords:

基金项目(Foundation): 爆破工程湖北省重点实验室开放基金(BL2021-23)~~

作者(Author): 李小帅,高文学,宿利平,张小军,胡宇,薛睿

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