摘要
为了解隧道掘进爆破振动信号在地表及上部岩体内传播的特征,以鹤大高速小沟隧道掘进爆破为工程背景进行研究。对地表部分,现场监测后利用小波包分析对监测数据进行信号去噪重构处理,对得到的纯净信号进行时频分析及能量分布研究,进而得出振动信号沿地表的频率分布规律及能量衰减规律。对上部岩体,利用ANSYS/LS-DYNA进行数值模拟,提取关键点振速,分析得出开挖与未开挖两侧振动信号在隧道上部岩体内传播过程中的质点振速与能量衰减规律。为隧道爆破掘进动力响应研究、爆破震害评估和爆破设计的改进提供依据。
In order to know the propagation characteristics of tunnel excavation blasting vibration on surface and in upper rock mass, blasting excavation of Xiaogou Tunnel at Heda Express Way was studied. For the earth＇s surface, con- duct, using wavelet packet analysis method was used after site monitoring in signal denoising and reconstruction process. And time frequency analysis and energy distribution of the pure vibration signal were obtained. Then, frequency distribution law of vibration signal and energy attenuation law were got. For the upper rock mass, ANSYS/LS-DYNA software was used to simulate blasting excavation and extract vibration velocity at key points. And vibration signal particle velocity and energy attenuation law from both sides of the excavation and excavation in upper rock mass were analyzed. It provides the basis for the research on dynamic response of tunnel blasting excavation, improvement of blasting damage assessment and blasting design.
出处
《爆破器材》
CAS
2016年第4期54-60,共7页
Explosive Materials
关键词
振动信号
地表及上部岩体
小波包分析
LS-DYNA数值模拟
传播特征
vibration signal
surface and upper rock mass
wavelet packet analysis
LS-DYNA numerical simulation
propagation characteristics
