大型洞库开挖爆破振动影响的简化加荷方法
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摘要
为通过简单加荷方法了解爆破振动对周围结构的影响,针对某大型地下洞库,在利用数值模拟方法分析开挖爆破对临近衬砌的影响中,根据柱状药包爆破情况和爆破振动的传播特点,利用衰减后的波动模拟爆破振动加载,形成作用于开挖面上的动荷载形式。通过数值模拟结果和现场测定结果的对比分析,得到较好的模拟效果。可以用此简化加荷方法进行类似动荷载对结构的振动影响分析。
To study the effects of blast vibration on the adjacent structure,the method of numerical simulation was used to analyze the effect of blast vibration on the adjacent concrete liner in a certain large-scale tunnel.Based on the attenuation law of the blast waves in rock of the cylinder charge,the dynamical load added on the excavation face after the attenuation was used to simulate the excavation explosion vibration.The numerical simulation results agree well with the experimental observation.
To study the effects of blast vibration on the adjacent structure,the method of numerical simulation was used to analyze the effect of blast vibration on the adjacent concrete liner in a certain large-scale tunnel.Based on the attenuation law of the blast waves in rock of the cylinder charge,the dynamical load added on the excavation face after the attenuation was used to simulate the excavation explosion vibration.The numerical simulation results agree well with the experimental observation.
引文
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[2]赵健平,徐国元.结构近中区爆炸波能量分配和衰减特征[J].科技导报,2009,27(1):34-37.ZHAO Jian-ping,XU Guo-yuan.Energy distribution and decay characteristics of explosive wave in near cavity of concrete[J].Science&Technology Review,2009,27(1):34-37.(in Chinese).
[3]吴小波.海边山坡场地爆破地震波的衰减测试与分析[J].振动、测试与诊断,2009(6):188-191.WU Xiao-bo.Test and analysis of attenuation of blasting vibration at hillside field near coast[J].Jour-nal of Vibration,Measurement&Diagnosis,2009(6):188-191.(in Chinese).
[4]包德勇.小间距隧道爆破振动的影响分析[J].铁道勘测与设计,2008(4):90-94.BAO De-yong.Analysis on impact of vibration by tunnel blast in short distance[J].Railway Standard Design,2008(4):90-94.(in Chinese).
[5]张建平.自由面数量对爆破振动规律影响实验研究[J].现代矿业,2009,7(7):46-48.ZHANG Jian-ping.Experimental research on effects of free surface quantity on blasting vibration laws[J].Modern Minng,2009,7(7)46-48.(in Chinese).
[6]晏俊伟,龙源,娄建武,等.爆破地震波的分形机制[J].解放军理工大学学报:自然科学版,2008,9(4):367-372.YAN Jun-wei,LONG Yuan,LOU Jian-wu,et al.Fractal mechanism of blasting seismic wave[J].Jour-nal of PLA University of Science and Technology(Natural Science Edition),2008,9(4):367-372.(in Chinese).
[7]刘权,龙源,纪冲,等.条形不耦合平面布药技术在硐室爆破中的应用[J].解放军理工大学学报:自然科学版,2006,7(1):64-68.LIU Quan,LONG Yuan,JI Chong,et al.Applica-tion of decoupling linear plane charge in chamber blasting[J].Journal of PLA University of Science and Technology(Natural Science Edition),2006,7(1):64-68.(in Chinese).
[8]姜鹏飞,唐德高,龙源.不耦合装药爆破对硬岩应力场影响的数值分析[J].岩石力学,2009,30(1):275-279.JIANG Peng-fei,TANG De-gao,LONG Yuan.Nu-merical analysis of influence of uncoupled explosive-charge structure on stress field in hard rocks[J].Rock and Soil Mechanics,2009,30(1):275-279.(in Chinese).
[9]中华人民共和国国家标准编写组.爆破安全规程[S].GB6722—2003.北京:冶金工业出版社,2003.
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