顺层边坡岩体的爆破振动特性试验研究
|
摘要
以顺层岩质路堑开挖爆破为背景,针对深孔爆破与小台阶爆破两种爆破方法进行了5次现场爆破试验,在测定不同方向上岩体质点振动速度的基础上,分析层状岩体的地震波传播特征及其影响因素。研究结果表明:深孔爆破产生的地震强度是小台阶爆破的5倍以上;同一次爆破中,深孔爆破沿走向的振动速度是垂直走向的1.1~1.4倍,而对于小台阶爆破的相应值为1.2~1.9倍;在顺层岩质路堑施工中,可采用预留保护层的深孔爆破分部开挖方案,并通过微差起爆技术限制单段最大装药量,以达到降震目的。
Taking the excavation blasting of chasm at layered rock slope as the background,five blasting experiments considering two different blasting ways including deep-hole blasting and small-bench blasting have been done.Through measuring the particle vibration velocities in different directions,the propagating characteristics of seismic waves in layered rock mass and their affecting factors are analyzed.The research results show that the vibration intensity resulting from deep-hole blasting is over 5 times than that of small-bench blasting;at the same blasting,the vibration velocity along the strike of slope is about 1.1～1.4 times as that of its vertical direction in deep-hole blasting,and the corresponding value for small-bench blasting is 1.2～1.9;in the construction of chasm at layered rock slope,the multi-step excavation scheme of deep-hole blasting with the projection layer can be used,and the maximum charge amount per delay interval could be restricted by the millisecond delay initiation so as to reduce the vibration intensity.
Taking the excavation blasting of chasm at layered rock slope as the background,five blasting experiments considering two different blasting ways including deep-hole blasting and small-bench blasting have been done.Through measuring the particle vibration velocities in different directions,the propagating characteristics of seismic waves in layered rock mass and their affecting factors are analyzed.The research results show that the vibration intensity resulting from deep-hole blasting is over 5 times than that of small-bench blasting;at the same blasting,the vibration velocity along the strike of slope is about 1.1～1.4 times as that of its vertical direction in deep-hole blasting,and the corresponding value for small-bench blasting is 1.2～1.9;in the construction of chasm at layered rock slope,the multi-step excavation scheme of deep-hole blasting with the projection layer can be used,and the maximum charge amount per delay interval could be restricted by the millisecond delay initiation so as to reduce the vibration intensity.
引文
[1]周维垣.高等岩石力学[M].北京:水利电力出版社,1990:237~238
[2]张永哲.水电工程爆破面临的主要问题[C].第七届全国工程爆破学术会议论文集,成都,2001:26~30
[3]李启发.爆破地震波对岩质边坡稳定性的影响[J].爆破,1995,12(1):1~4
[4]孟吉复,惠鸿斌.爆破测试技术[M].北京:冶金工业出版社,1992:210~213
[5]周国祥,刘开文,徐东明.爆破震动监测与防震[J].爆破,2001,18(4):75~76
[6]陈华腾,钮强,等.爆破计算手册[M].沈阳:辽宁科学技术出版社,1991:159~160
[7]吴青山,张继春,等.顺层路堑边坡岩体爆破的层裂效应试验研究[J].中国铁道科学,2004,25(3):50~54
[2]张永哲.水电工程爆破面临的主要问题[C].第七届全国工程爆破学术会议论文集,成都,2001:26~30
[3]李启发.爆破地震波对岩质边坡稳定性的影响[J].爆破,1995,12(1):1~4
[4]孟吉复,惠鸿斌.爆破测试技术[M].北京:冶金工业出版社,1992:210~213
[5]周国祥,刘开文,徐东明.爆破震动监测与防震[J].爆破,2001,18(4):75~76
[6]陈华腾,钮强,等.爆破计算手册[M].沈阳:辽宁科学技术出版社,1991:159~160
[7]吴青山,张继春,等.顺层路堑边坡岩体爆破的层裂效应试验研究[J].中国铁道科学,2004,25(3):50~54
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