摘要
沪蓉高速公路宜昌-恩施段修建在崇山峻岭之中,其桥隧长占路线总长的50％,为减少工程的投资,在部分地段将采用浅埋双跨连拱隧道的方案来实现桥隧的合理过渡。在小间距(5.5-25m)隧道过渡段,隧道爆破将对相邻隧道的稳定性造成较大影响。为确定合理的爆破装药量以确保相邻洞室围岩在爆破振动时的稳定性,应用有限差分法FLAC3D程序对钻爆法施工时爆破孔进行起爆加载,动态模拟了隧道在不同围岩特性条件下装药量大小对相邻洞室围岩关键点的影响程度,得到了爆破时围岩的振动速度历时曲线和围岩的破损情况,并提出了确保工程稳定的合理装药量,研究成果为工程的设计与施工提供了科学依据。
The section from Yichang to Enshi of the Shanghai-Chengdu expressway goes through mountainous area, and bridges and tunnels account for 50% of the length of the section. Shallow large-span double-linked-arch tunnel was adopted to save investment at the transition between bridges and tunnels. The spacing of tunnels is 5.5-25 m in the transition segments. The blasting of tunnel will have big influence on the stability of the adjacent tunnel. In this paper, the FDM software FLAC3D is employed to simulate the dynamic load on boreholes of the tunnels in different rock masses during blasting. The influence of the charge on the vibration velocity at key points, vibration velocity-history and the state of remained rock masses are obtained from numerical results. A reasonable dynamite charge is suggested. The conclusions are valuable in design and construction of the tunnels.
出处
《岩石力学与工程学报》
EI
CAS
CSCD
北大核心
2004年第z2期4744-4748,共5页
Chinese Journal of Rock Mechanics and Engineering
关键词
隧道工程
大跨度
小间距隧道
爆破
振动
稳定性
tunneling engineering, large span, small-spacing tunnel, blasting, vibration, stability
