摘要
工程爆破对周围建(构)筑物造成不同程度的负面影响。结合某大坝近区隧道开挖的爆破振动监测数据,通过频谱分析获取该坝体的主振频率,利用小波多分辨率技术研究不同频率段内爆破振动能量的分布规律,利用三维有限元模型对空库和满库情况下的坝体进行模态分析,最终综合主振频率、振动能量、振动模态以及质点峰值振速作为爆破振动效应的安全判据,得出爆破振动对该大坝安全影响较小的结论。分析结果对于类似工程的爆破振动安全评估研究具有一定的指导意义。
The safety assessment for blasting vibration of the tunnel excavation near a dam is presented.Spectral analysis is performed to obtain the vibration frequencies.Wavelet multi-resolution analysis is used to extract the vibration energy in different frequency bands,and the energy distribution is also discussed.3D finite element vibration modal analysis of the dam with empty or full reservoir is conducted.Considering the safety criterion including vibration frequency,energy,structural modal parameters,and peak values of vibration velocity,we find the dam is safe under the impact of blasting vibration.The result is also helpful for the safety assessment of blasting vibration for similar projects.
出处
《长江科学院院报》
CSCD
北大核心
2012年第4期26-29,39,共5页
Journal of Changjiang River Scientific Research Institute
基金
浙江省科研院所专项创新团队建设与人才培养项目(2009F20021)
关键词
爆破振动
小波
大坝
模态分析
安全判据
blasting vibration
wavelet
dam
modal analysis
safety criterion
