近距离爆破对既有隧道的振动影响
|
摘要
根据实测资料,运用统计回归方法,进行近距离爆破对隧道周边振动场分布影响的分析,得出结论:最大振动速度出现在隧道迎爆侧的墙壁和拱部,墙脚点振动速度较小,背爆侧振动相对较轻;爆源越近,迎爆侧与背爆侧振动反差越大。比例距离越大,隧道周边的振动峰值速度分布越趋于均匀;爆破夹制作用越大,邻近隧道产生的爆破振动越大;岩体越坚硬完整,振动峰值衰减越慢。提出增加起爆段别,减小单段爆炸药量,增加空孔,改善临空面,减小夹制作用等降低爆破振动的措施。
According to the actual survey data and by adopting statistical regression method, analyses of the (adjacent) blasting influence were carried out on the distribution of vibration field circumjacent to the tunnel. Some conclusions have been drawn. The maximum vibration speed occurs on tunnel wall and arch section facing the (blasting) side. The vibration speed at the foot of the wall is relatively small. The vibration back facing the (blasting) side is comparatively small. The closer to the blasting source, the bigger is the contrast of the vibration between front facing side and back facing side. When proportional distance becomes longer, the speed (distribution) of vibration peak value circumjacent to the tunnel will be more even. The more the blasting clamping force is, the more blasting vibration is produced to the adjacent tunnel. If the rock body is harder and complete, the peak value of vibration will be declined more slowly. Measures for reducing blasting vibration are proposed, such as increasing primary blasting segments, decreasing explosive volume for single segment, adding more (empty) holes, improving free face and lessening clamping force.
According to the actual survey data and by adopting statistical regression method, analyses of the (adjacent) blasting influence were carried out on the distribution of vibration field circumjacent to the tunnel. Some conclusions have been drawn. The maximum vibration speed occurs on tunnel wall and arch section facing the (blasting) side. The vibration speed at the foot of the wall is relatively small. The vibration back facing the (blasting) side is comparatively small. The closer to the blasting source, the bigger is the contrast of the vibration between front facing side and back facing side. When proportional distance becomes longer, the speed (distribution) of vibration peak value circumjacent to the tunnel will be more even. The more the blasting clamping force is, the more blasting vibration is produced to the adjacent tunnel. If the rock body is harder and complete, the peak value of vibration will be declined more slowly. Measures for reducing blasting vibration are proposed, such as increasing primary blasting segments, decreasing explosive volume for single segment, adding more (empty) holes, improving free face and lessening clamping force.
引文
[1] Giogio Berta. Blasting-induced Vibration in Tunnel [J]. Tunneling and Underground Space Technology,1994,9(2):175—187.
[2]高晓初,吴子骏.运营隧道小间距平行隧道开挖爆破安全控制[A].工程爆破文集第六辑[C].深圳:海天出版社,1997.
[3]林学义,王兰民.隧洞的爆破地震动效应问题[A].工程爆破文集第六辑[C].深圳:海天出版社,1997.
[4]杨年华,张志毅,邓志勇,等.硬岩特长隧道快速爆破掘进技术研究与实践[J].中国铁道科学,2001,22(3):41—46.
[5]杨年华.城区浅埋隧道敏感地段爆破掘进技术[A].铁道科学研究院院庆55周年论文集[C].北京:铁道出版社,2005.
[2]高晓初,吴子骏.运营隧道小间距平行隧道开挖爆破安全控制[A].工程爆破文集第六辑[C].深圳:海天出版社,1997.
[3]林学义,王兰民.隧洞的爆破地震动效应问题[A].工程爆破文集第六辑[C].深圳:海天出版社,1997.
[4]杨年华,张志毅,邓志勇,等.硬岩特长隧道快速爆破掘进技术研究与实践[J].中国铁道科学,2001,22(3):41—46.
[5]杨年华.城区浅埋隧道敏感地段爆破掘进技术[A].铁道科学研究院院庆55周年论文集[C].北京:铁道出版社,2005.
版权所有：© 2023 中国地质图书馆 中国地质调查局地学文献中心