连拱隧道爆破荷载效应分析
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摘要
针对连拱隧道设计、施工中存在的问题,采用三维有限差分程序FLAC3D2.0,对连拱隧道进行了爆破荷载数值模拟分析。分析结果表明,在相同条件下,爆破振动受围岩弹性模量的影响较大,围岩越弱、振动越强烈,反之,围岩越硬、振动越小;爆破应力波最初以冲击波的形式向外传播,随着波阵面不断向外传播,冲击波发生衰减,逐渐从强冲击波衰减成弹性波和地震波,围岩越好、衰减速度越快;爆破振动对隧道的危害主要由一次齐爆最大单响装药量确定;爆破对临时支护的影响较显著,应采用有效措施保护中墙。
In the light of the problems in design and construction of dual-arch tunnel,in this paper three-dimensional finite difference code FLAC3D2.0 is used to carry on a numerical simulation analysis of blasting load of multi-arch tunnel.The results show that under the same condition,blasting vibration is greatly influenced by elastic modulus E of the surrounding rock.The softerer surrounding rock,the stronger the vibration.Blasting stress wave is initially propagated outward in the form of shock wave,which gradually attenuates and turns into elastic wave and seismic wave.The higher level of the surrounding rock,the higher speed of the attenuation.The damage to the tunnel of blasting vibration is mainly determined by the maximum charge weight of single shot for the single simultaneous blasting.Blasting has significant influence on the temporary support,so effective measures must be taken to protect the midboard.
In the light of the problems in design and construction of dual-arch tunnel,in this paper three-dimensional finite difference code FLAC3D2.0 is used to carry on a numerical simulation analysis of blasting load of multi-arch tunnel.The results show that under the same condition,blasting vibration is greatly influenced by elastic modulus E of the surrounding rock.The softerer surrounding rock,the stronger the vibration.Blasting stress wave is initially propagated outward in the form of shock wave,which gradually attenuates and turns into elastic wave and seismic wave.The higher level of the surrounding rock,the higher speed of the attenuation.The damage to the tunnel of blasting vibration is mainly determined by the maximum charge weight of single shot for the single simultaneous blasting.Blasting has significant influence on the temporary support,so effective measures must be taken to protect the midboard.
引文
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[3]刘慧.邻近爆破对隧道影响的研究进展[J].爆破,1999,16(1):57-63.
[4]阳生权.爆破地震安全判据的缺陷与改进[J].爆炸与冲击,2001,21(3):223-227.
[5]言志信,王永和,江平,等.爆破地震测试及建筑结构安全标准研究[J].岩石力学与工程学报,2003,23(11):1907-1911.
[6]杨年华,刘慧.近距离爆破引起的隧道周边振动场[J].工程爆破,2000,(6).
[7]齐景豫,刘正雄,张儒林,等.隧道爆破现代技术[M].北京:中国铁道出版社,1999.
[8]刘殿书.岩石爆破破碎的数值模拟[D].北京:中国矿业大学,1992.
[9]刘殿书,王树仁.柱状装药爆破破碎过程的数值模拟研究[C]//工程爆破文集.北京:中国地质大学出版社,1993.
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