高速公路浅埋大跨度双跨连拱隧道爆破振动影响研究
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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.
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.
引文
1 刘慧.邻近爆破对既有隧道影响的研究[博士学位论文][D].北 京:铁道部科学研究院,1998
2 谭忠盛,杨小林,王梦恕.复线隧道施工爆破对既有隧道的影响分 析[J].岩石力学与工程学报,2003,22(2):281-285
3 刘沼泉.爆破工程师手册[M].北京:煤炭工业出版社,1992
4 张雪亮,黄树棠.爆破地震效应[M].北京:地震出版社,1981
5 中华人民共和国行业标准编写组.爆破安全规程(GB6722-86)[S]. 北京:冶金工业出版社,1986
6 吴德伦,叶晓明.工程爆破安全振动速度综合研究[J].岩石力学与 工程学报,1997,16(3):266-273
7 李玉民,倪芝芳.地下工程开挖爆破的地面振动特征[J].岩石力学 与工程学报,1997,16(3):274-278
8 李宏男.爆破地震效应若干问题的探讨[J].爆炸与冲击,1996, 16(1):61-67
9 卢文波.爆破地震波传播过程中衰减参数的确定[J].工程爆破, 1997,3(4):12-16
10 卢文波,Hustrulid W.质点峰值振动速度衰减公式的改进[J].工程 爆破,2002,8(3):1-4
11 肖正学,张志呈,郭学彬.断裂控制爆破裂纹发展规律的研究[J]. 岩石力学与工程学报,2002,21(4):546-549
12 孙豁然,肖海军,姜培男.露天爆破对主运输平硐振动影响的模拟 分析[J].金属采矿,2003,(2):9-12
2 谭忠盛,杨小林,王梦恕.复线隧道施工爆破对既有隧道的影响分 析[J].岩石力学与工程学报,2003,22(2):281-285
3 刘沼泉.爆破工程师手册[M].北京:煤炭工业出版社,1992
4 张雪亮,黄树棠.爆破地震效应[M].北京:地震出版社,1981
5 中华人民共和国行业标准编写组.爆破安全规程(GB6722-86)[S]. 北京:冶金工业出版社,1986
6 吴德伦,叶晓明.工程爆破安全振动速度综合研究[J].岩石力学与 工程学报,1997,16(3):266-273
7 李玉民,倪芝芳.地下工程开挖爆破的地面振动特征[J].岩石力学 与工程学报,1997,16(3):274-278
8 李宏男.爆破地震效应若干问题的探讨[J].爆炸与冲击,1996, 16(1):61-67
9 卢文波.爆破地震波传播过程中衰减参数的确定[J].工程爆破, 1997,3(4):12-16
10 卢文波,Hustrulid W.质点峰值振动速度衰减公式的改进[J].工程 爆破,2002,8(3):1-4
11 肖正学,张志呈,郭学彬.断裂控制爆破裂纹发展规律的研究[J]. 岩石力学与工程学报,2002,21(4):546-549
12 孙豁然,肖海军,姜培男.露天爆破对主运输平硐振动影响的模拟 分析[J].金属采矿,2003,(2):9-12
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