爆破动力作用下小净距隧道围岩振动效应分析
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摘要
以渝长高速公路武隆小净距隧道掘进爆破为背景,应用FLAC3D数值模拟法进行隧道掘进爆破条件下的前洞围岩振动效应分析。通过计算结果与试验数据的对比分析,证明了应用此计算方法进行振动强度分析的可行性。进一步分析表明,全断面不同循环进尺爆破方案引起振动速度的分布规律基本相同;在爆破掌子面前,前洞迎爆侧边墙上的最大振动速度沿隧道轴线方向随水平距离增大有明显的放大现象,最大振动速度发生在爆破掌子面前面10 m左右前洞断面迎爆侧的边墙上;在爆区附近,前洞迎爆侧围岩上的振动速度是背爆侧的6—10倍。
Taking the project of Wulong small clear distance tunnel driving blasting in Yu-chang high speed highway as the background,used FLAC3D numerical simulation to analyze the vibration effects on surrounding rock in the situation of tunnel driving blasting.By comparing the calculation results with the field monitoring results to testify that this calculation method is feasible to analyze vibration strength.Further analysis show that the distribution rule of vibration velocity caused by different footage full-face blast is approximately the same.Before the blasting tunnel face,as the horizontal distance becomes longer,the maximum vibration velocity on front tunnel abutment wall along tunnel axial line has obvious magnification,where the maximum vibration velocity occurs at 10 m before the blasting tunnel face;the vibration velocity of front tunnel surrounding rock facing to blasting is as big as 6—10 times of that on the back of blasting.
Taking the project of Wulong small clear distance tunnel driving blasting in Yu-chang high speed highway as the background,used FLAC3D numerical simulation to analyze the vibration effects on surrounding rock in the situation of tunnel driving blasting.By comparing the calculation results with the field monitoring results to testify that this calculation method is feasible to analyze vibration strength.Further analysis show that the distribution rule of vibration velocity caused by different footage full-face blast is approximately the same.Before the blasting tunnel face,as the horizontal distance becomes longer,the maximum vibration velocity on front tunnel abutment wall along tunnel axial line has obvious magnification,where the maximum vibration velocity occurs at 10 m before the blasting tunnel face;the vibration velocity of front tunnel surrounding rock facing to blasting is as big as 6—10 times of that on the back of blasting.
引文
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[2]刘波,韩彦辉.FLAC原理、实例与应用指南[M].北京:人民交通出版社,2005.
[3]戴俊.岩石动力学特征与爆破理论[M].北京:冶金工业出版社,2005.
[4]陈占军,朱传云,周小恒.爆破荷载作用下岩石边坡动态响应的FLAC3D模拟研究[J].爆破,2005,22(4):7-13.
[5]刘国华,王振宇.爆破荷载作用下隧道的动态响应与抗爆分析[J].浙江大学学报,2004,38(2):204-209.
[6]阳生权.小线间距施工隧道爆破地震影响下既有隧道围岩线性动力分析[J].工程爆破,1998,4(1):1-6.
[7]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(2):501-506.
[8]曹孝君,张继春,吕和林.隧道掘进爆破引起地表振动的数值模拟与现场监测分析[J].中国公路学报,2007,20(2):87-91.
[9]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(2):6-10.
[10]许锡宾,赵明阶,荣耀.公路隧道爆破掘进振动效应研究[J].水运工程,2004,368(9):74-78.
[11]彭道富,李忠献,杨年华.近距离爆破对既有隧道的振动影响[J].中国铁道科学,2005,26(4):73-76.
[12]刘慧,史雅语,冯叔瑜.招宝山超小净间距双线隧道控制爆破监测[J].爆破,1997,14(4):25-28.
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