小间距隧道爆破地震效应的损伤控制研究
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摘要
为了分析近距离爆破对相邻既有隧道的振动影响,进行了现场爆破振动监测试验。结果表明,振动速度具有很强的方向性,各测点沿隧道断面的径向振动速度均大于切向速度,且振动速度均随着与震源距离的增大呈非线性减小。基于试验结果的统计回归和对爆破中区爆生气体压应力场作用下岩石微裂纹扩展机理的分析,假定岩石动态极限抗拉强度超过微裂纹临界应力时引起新的材料损伤,通过爆破中区损伤断裂准则得到了质点振动速度的安全阈值。结合爆破监测回归公式给出了不同距离情况下单段最大药量建议值。
For analyzing the vibration effect on existing tunnel induced by closed-in blasting,the site blasting experiments were monitored.The results show that the vibration velocity is stronly directional,and the radial velocity was larger than the tangential velocity along the tunnel section and the velocity was nonlinear decreased following the distance.Based on the statistical regression of experimental results and analysis of microcrack propagation mechanism of rock under compressive stress field of detonation gas,and on assuming the new damage will be generated when the dynamic failure tensile strength of rock was over the microcrack critical stress,the safety threshold value of particle vibration velocity could be obtained by mid-area damage fracture criterion of blasting.The max charge per delay at different distance was suggested combining with the regression equation of monitor results.
For analyzing the vibration effect on existing tunnel induced by closed-in blasting,the site blasting experiments were monitored.The results show that the vibration velocity is stronly directional,and the radial velocity was larger than the tangential velocity along the tunnel section and the velocity was nonlinear decreased following the distance.Based on the statistical regression of experimental results and analysis of microcrack propagation mechanism of rock under compressive stress field of detonation gas,and on assuming the new damage will be generated when the dynamic failure tensile strength of rock was over the microcrack critical stress,the safety threshold value of particle vibration velocity could be obtained by mid-area damage fracture criterion of blasting.The max charge per delay at different distance was suggested combining with the regression equation of monitor results.
引文
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[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]刘玉山,陈建平.大轩岭小净距隧道爆破振动监测与分析[J].爆破,2008,25(2):92-94.
[4]刘慧.近距侧爆情况下马蹄形隧道动态响应特点的研究[J].爆炸与冲击,2000,20(2):175-181.
[5]刘先林,周传波,张国生,隧洞开挖爆破振动监测与振速预测分析[J].爆破,2008,25(3):96-99.
[6]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.
[7]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.
[8]张学民,阳军生,刘宝琛.层状岩体中近邻双线隧道爆破的振动响应研究[J].湖南科技大学学报,2006,21(4):70-74.
[9]张继春.工程控制爆破[M].成都:西南交通大学出版社,2001.
[10]钮强.岩石爆破机理[M].沈阳:东北工学院出版社,1990.
[11]杨小林,王树仁.岩石爆破损伤断裂的细观机理[J].爆炸与冲击,2000,20(3):247-252.
[12]余寿文,冯西桥.损伤力学[M].北京:清华大学出版社,1997.
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