四车道扩挖隧道爆破振动对新建隧道的影响
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摘要
以泉厦高速公路大帽山隧道为工程背景,应用数值模拟方法从振动速度、振动应力和应力波3个方面分析得出沿扩挖隧道轴向动力特性,同时分析自由面对爆破地震波的影响.结果表明:距掌子面15m处振速衰减达50%,且在离掌子面10m处振速已经低于安全临界值;最大主应力峰值在距掌子面15m的范围内衰减最快,在离掌子面15以上时爆破振动影响逐渐趋于稳定;应力波在0.4ms时应力达到最大值13.3GPa,而在0.6ms时最大应力衰减到771.2MPa,只有0.4ms时的5.80%;自由面对爆破地震波的反射作用使能量损失55.6%,但先建隧道自由面使地震波反射叠加,从而使能量增加.
Taking Tai Mao Shan tunnel in Quanxia express way as example,the analysis of the vibration velocity,vibration stress and stress wave was carried out by the numerical simulation,to obtain the dynamic axial characteristics during the tunnel expansion,the influence of the free face on seismic wave of blasting was investigated.The results show that: the velocity attenuation is up to 50% 15 meters away from the tunnel face,and the velocity is below the safe value 10 meters away from the tunnel face;the attenuation of the peak maximum principal stress is the largest within 15 meters away from the tunnel face,for the region more than 15 meters away from the tunnel face,the blasting vibration tends to be stable;the stress wave reaches the maximum stress 13.3 GPa at 0.4 ms,and maximum stress attenuation to 771.2 MPa at 0.6 ms,which is only 5.80% of 0.4 ms;the energy dissipation is up to 55.6% due to the blasting seismic wave reflection caused by free face effects,but the free face of the constructed tunnel superposes the seismic reflection,so that the energy increases.
Taking Tai Mao Shan tunnel in Quanxia express way as example,the analysis of the vibration velocity,vibration stress and stress wave was carried out by the numerical simulation,to obtain the dynamic axial characteristics during the tunnel expansion,the influence of the free face on seismic wave of blasting was investigated.The results show that: the velocity attenuation is up to 50% 15 meters away from the tunnel face,and the velocity is below the safe value 10 meters away from the tunnel face;the attenuation of the peak maximum principal stress is the largest within 15 meters away from the tunnel face,for the region more than 15 meters away from the tunnel face,the blasting vibration tends to be stable;the stress wave reaches the maximum stress 13.3 GPa at 0.4 ms,and maximum stress attenuation to 771.2 MPa at 0.6 ms,which is only 5.80% of 0.4 ms;the energy dissipation is up to 55.6% due to the blasting seismic wave reflection caused by free face effects,but the free face of the constructed tunnel superposes the seismic reflection,so that the energy increases.
引文
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[2]姚勇,何川,晏启祥,等.董家山隧道小净距段爆破控制的数值模拟[J].岩土力学,2004,25(增刊1):501-506.
[3]崔积弘.隧道掘进爆破振动的数值模拟研究[D].青岛:山东科技大学,2005.
[4]崔积弘,周建,林从谋.爆破震动对既有洞室影响的数值模拟[J].有色金属,2008,60(1):101-104.
[5]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.
[6]龙源,冯长根,徐全军,等.爆破地震波在岩石介质中传播特性与数值计算研究[J].工程爆破,2000,6(3):1-7.
[7]孟吉复,惠鸿斌.爆破振动测试技术[M].北京:冶金工业出版社,1992:80-138.
[8]张奇,白春华,刘庆明.爆炸地震波频谱特性研究[J].北京理工大学学报,1999,19(3):306-308.
[9]张义平,吴桂义.爆破地震波特性研究[J].矿业研究与开发,2007,27(6):68-72.
[10]李洪涛,卢文波,舒大强,等.爆破地震波的能量衰减规律研究[J].岩石力学与工程学报,2010,29(增刊1):3364-3369.
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