【摘要】 爆破开挖施工是目前山岭隧道施工的主要方式之一,爆破地震波对山体稳定,尤其是对既有隧道结构的安全稳定研究至关重要。依托千枚岩小间距隧道工程,开展了爆破开挖围岩地震波传递规律和对既有隧道影响的现场监测与分析研究。研究表明,千枚岩小间距隧道Ⅳ级围岩段的最大地震波波速为13.03～19.54cm/s,V级围岩为5.53～11.05cm/s;在给定药量和设计波速条件下,千枚岩安全距离至少应在12m以上;在施工期间与爆破开挖面对应位置的既有隧道前后方约2.0倍洞径范围内应是重点观测区域范围。更多还原

【Abstract】 Blasting excavation construction is one of the main ways in mountain tunnel construction.The research on blasting seismic wave to the mountain body stability,especially to the existing structure is the utmost importance.Analysis and study on the transfer law of seismic wave of surrounding rock and in-situ monitoring on the effect of blasting excavation to the existing structure are done in this paper based on phyllite neighbourhood tunnels engineering.Research suggests that the maximum velocity of seismic wave in the fourth grade surrounding rock is from 13.03 to 19.54 cm/s,the one of the fifth surrounding rock is from 5.53 to 11.05 cm/s.Under the conditions of given the amount of explosives and the design velocity,the safe distance of phyllite should be not less than 12 m.The area,in the range of 2 times larger than tunnel diameter,in front and behind of where correspond with the blasting excavation surface of construction tunnel in the existing tunnel,is the key monitoring domain,etc.更多还原