摘要
采用LS—DYNA3D动力有限元程序，建立某小净距隧道的三维模型。通过刚度等效的方法，分析了既有隧道不同钢拱架布置间距情况下既有隧道的动力响应。研究结果表明，随既有隧道钢拱架加固间距的减小，迎爆侧测点振速和位移峰值亦随之增加。建议小净距隧道爆破施工时，既有隧道钢拱架加固间距为0．5—1．0m。
By using the LS-DYNA3D dynamic finite element program, three-dimensional model of tunnels with small spacing was established. By using the method of equivalent stiffness, dynamic response of the existing tun- nel with different spacing between steel archs was analysed in this paper. The results indicate that the peak val- ues of vibration velocity and displacement of measured point increase with the decrease of spacing between steel archs in existing tunnel. It is suggested during the construction blasting of tunnels with small spacing, the reasonable spacing of steel arc in existing tunnel is 0.5 - 1.0 m.
出处
《贵州大学学报（自然科学版）》
2013年第6期122-124,共3页
Journal of Guizhou University:Natural Sciences
基金
教育部博士点基金(20123514120005)
关键词
小净距隧道
爆破荷载
钢拱架间距
tunnels with small spacing
blast load
spacing between steel archs
