深厚淤泥爆破挤淤震动效应测试与控制技术
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摘要
结合工程实例,对深厚淤泥爆破挤淤震动效应进行测试和分析,线性拟合得出震动速度随距离衰减规律,并从控制单段最大药量、选择合理微差时间、调整震动波传播方向3个方面对地震效应控制技术开展了试验研究。试验结果表明,这些措施可以有效地控制地震效应。控制单段起爆药量是最根本因素;在相同装药量的情况下,按照大于200ms的微差时间进行控制,最大震动速度可减小20%～30%,药包中心连线方向的震速比垂直于中心连线方向的震速低15%～25%。试验结果可为类似工程提供借鉴。
According to project example,the vibration effect due to deep and thick silt by blasting compaction is monitored and analyzed.The decay law of vibration velocity with distance by linear fitting is obtained;and experimental research in aspects of controlling single deck maximum explosions,ascertaining reasonable millisecond delay time,regulating transmission direction of vibration waves is carried out.Results show that vibration effect is effectively controlled by these measures.Controlling single deck explosions is the most basic factor;the amount of explosions should be decided by field experiment;when single deck explosions are the same,the maximum vibration velocity can decrease by 20 percent to 30 percent if we set the millisecond delay time more than 200 millisecond;and vibration velocity in the direction of explosions central line is 15 percent to 25 percent lower than that in its vertical direction.The research result may provide a model for the similar project.
According to project example,the vibration effect due to deep and thick silt by blasting compaction is monitored and analyzed.The decay law of vibration velocity with distance by linear fitting is obtained;and experimental research in aspects of controlling single deck maximum explosions,ascertaining reasonable millisecond delay time,regulating transmission direction of vibration waves is carried out.Results show that vibration effect is effectively controlled by these measures.Controlling single deck explosions is the most basic factor;the amount of explosions should be decided by field experiment;when single deck explosions are the same,the maximum vibration velocity can decrease by 20 percent to 30 percent if we set the millisecond delay time more than 200 millisecond;and vibration velocity in the direction of explosions central line is 15 percent to 25 percent lower than that in its vertical direction.The research result may provide a model for the similar project.
引文
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[10]付士根,许开立.爆破振动效应预报及减震措施[J].中国安全生产科学技术,2006,2(6):46-48.FU Shi-gen,XU Kai-li.Predicting blast vibration effect and reducing vibration measures[J].Journal of Safety Science and Technology,2006,2(6):46-48.
[2]赵简英,王健,吴京平.控制加载爆炸挤淤置换法在工程中的应用[J].岩土力学,2006,27(2):332-335.ZHAO Jian-ying,WANG Jian,WU Jing-ping.An application of blast method to squeeze mud and replacement with controlled loading[J].Rock and Soil Mechanics,2006,27(2):332-335.
[3]中华人民共和国交通部.JTJ/T258―98爆炸法处理水下地基和基础技术规程[S].北京:人民交通出版社,2003.
[4]张雪亮,黄树棠.爆破地震效应[M].北京:地震出版社,1991.
[5]冶金工业部安全技术研究所.GB6722―2003爆破安全规程[S].北京:中国标准出版社,2003.
[6]李俊如,李海波,高建光,等.抛石基床爆夯振动效应监测与分析[J].岩土力学,2005,26(9):1417-1420.LI Jun-ru,LI Hai-bo,GAO Jian-guang,et al.Monitoringand analysis of vibration effects due to underwater explosive ramming[J].Rock and Soil Mechanics,2005,26(9):1417-1420.
[7]胡刚,吴云龙.爆破地震控制的一种方法[J].煤炭技术,2004,23(4):104-105.HU Gang,WU Yun-long.A new method of the control of the earthquake vibration caused by explosive[J].Coal Technology,2004,23(4):104-105.
[8]王定华.宝钢马迹山港围堤工程爆破挤淤技术监控[J].工程爆破,2005,11(2):64-66.WANG Ding-hua.Technological supervision of ooze treatment in blasting cofferdam of Baogang Majishan Habor[J].Engineering Blasting,2005,11(2):64-66.
[9]李建高.既有线构(建)筑物旁控制爆破技术[J].隧道建设,2007,27(1):87-90.LI Jian-gao.Controlled blasting near existing railway buildings and structures[J].Tunnel Construction,2007,27(1):87-90.
[10]付士根,许开立.爆破振动效应预报及减震措施[J].中国安全生产科学技术,2006,2(6):46-48.FU Shi-gen,XU Kai-li.Predicting blast vibration effect and reducing vibration measures[J].Journal of Safety Science and Technology,2006,2(6):46-48.
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