孔内微差起爆降振技术在路堑开挖爆破中的应用
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摘要
针对某路堑开挖周边环境的特点,在爆破开挖过程中对爆破振动进行了实时监测。首先利用实测数据回归出了该地区的爆破地震波传播衰减规律,确定了常规生产爆破的安全距离为27m。然后在18～27m范围内常规爆破无法满足要求的情况下,提出了孔内微差与不耦合装药相结合的方案。施工结果表明,利用此方案可提高穿孔、装运效率,并能对爆破振动质点峰值速度进行有效的控制,达到了预期的效果。研究成果可为复杂环境下的爆破振动控制提供依据。
In view of the characteristics of the ambient circumstances,the real-time monitoring of blasting vibration was carried out in a cutting excavation.First,the attenuation rule of blasting seismic wave in this area was obtained by regression analysis of measured data,and the safe distance of regular blasting is determined as 27 m.Then,in the case of regular blasting in the range of18~27 m from buildings doing not meet safety requirements,a solution of in-hole millisecond delay detonation combining with decoupled charging was proposed.And the results of implementation showed that by using this method the desired effects were achieved,such as effectively controlling peak velocity of blasting vibration,improving efficiency of drilling and shipment.The results may provide a basis for blasting vibration control in complex environment.
In view of the characteristics of the ambient circumstances,the real-time monitoring of blasting vibration was carried out in a cutting excavation.First,the attenuation rule of blasting seismic wave in this area was obtained by regression analysis of measured data,and the safe distance of regular blasting is determined as 27 m.Then,in the case of regular blasting in the range of18~27 m from buildings doing not meet safety requirements,a solution of in-hole millisecond delay detonation combining with decoupled charging was proposed.And the results of implementation showed that by using this method the desired effects were achieved,such as effectively controlling peak velocity of blasting vibration,improving efficiency of drilling and shipment.The results may provide a basis for blasting vibration control in complex environment.
引文
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[2]周科平,李魁,邓红卫,等.云锡多金属矿中深孔爆破振动速度衰减规律研究[J].矿业研究与开发,2011,31(3):101-103.
[3]罗开军.孔内孔间微差爆破间隔时间的合理选择[J].金属矿山,2006,358(4):4-6.
[4]高富强,侯爱军,杨小林,等.基于量纲理论的爆破振动持续时间分析[J].金属矿山,2010,411(9):143-145.
[5]代贞伟,罗学东,张则岗,等.磁海铁矿露天开采爆破振动影响因素分析[J].爆破,2012,29(1):31-34.
[6]杨金华,夏元友,祝文化.风化岩体边坡开挖爆破试验研究[J].爆破,2012,29(1):51-54.
[7]夏晨曦,杨军,陈大勇,等.高精度雷管爆破振动信号特征比较分析[J].金属矿山,2011,420(6):133-136.
[8]张义平,王永明.台阶表面水介质对爆破地震波传播影响研究[J].矿业研究与开发,2009,29(3):75-77.
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