软弱围岩中连拱隧道爆破震动测试分析.pdf

桥隧施工与机械| BRIDGE AND TUNNEL CONSTRUCTION AND MACHINERY
文章编号:1000-033X(2013)11-0100-04
软弱围岩中连拱隧道爆破震动测试分析
张建伟',王永东2,周慧君,罗浩2
(1.杭州市交通工程质量安全监督局,浙江杭州310014;2.长安大学公路学院,陕西西安710064)
摘要:结合闲林隧道爆破施工,对软弱围岩中连拱隧道爆破震动进行监测,分析了震动波在软弱
国岩和支护结构中的传播及分布规律。研究表明,爆破最大振速一般出现在第一个峰值上;爆破震
动对爆破面前后10m范国内的中隔墙影响较大,随着距离的增大,震动波衰减明显;建议软弱围
岩中连拱隧道开挖最大装药量控制在8kg以内。研究结论可为类似条件下连拱隧道的瀑破施工
参数设计和现场监測提供借鉴与参考。
关键词:隧道工程;软弱围岩;连拱隧道;爆破测试
中图分类号:U455.4
文献标志码:B
Measurement and Analysis of Blasting Vibration in Double-arch
Tunnel with Weak Surrounding Rock
ZHANG Jian-wei,WANG Yong-dong, ZHOU Hui jun, LUO Hao
(1. Hangzhou Traffic Engineering Quality Safety Supervision Bureau, Hangzhou 310014, Zhejiang, China
2. School of Highway, Chang'an University, Xian 710064, Shaanxi, China
Abstract Combined with the blasting construction of Xianlin Tunnel, the blasting vibration in
double-arch tunnel with weak surrounding rock was measured. The propagation and distribution
characteristics of vibration waves in the weak surrounding rock and supporting structure were
analyzed. The results show that blasting maximum vibration velocity often appears in the first
peak, the disturbance range of blasting vibration to partition wall is 10 m apart from the blasting
working face. With the distance increasing, the shock wave is attenuated significantly. Double-
arch tunnel excavation maximum loading dynamite would be controlled within 8 kg in weak
surrounding rock. The experience and conclusions presented can be referred in the design of
blasting parameters and site monitoring of similar tunnels
Key words: tunnel engineering; weak surrounding rock; double-arch tunnel; blasting measure
ment
胁施工人员的安全,而且增加施工难度,并影响施工
0引言
进度和质量。爆破造成的不良影响主要体现在两个
在地下工程掘进施工过程中普遍存在着爆破开方面:一是在围岩内产生裂纹或使固岩中原有裂纹
挖和保护围岩这一互相矛盾却又必须解决的问题。扩展,影响若体的完整性,并会使岩石的力学性能恶
山皊隧道采用新奥法施工时,一般采用爆破施工,在化,降低岩石的强度和弹性模量;二是爆破施工会对
软弱围岩条件下,爆破施工在将开挖范围内的岩石已施作的支护结构尤其是临近结构产生较大的震
爆破下来的同时,必然也会对保留岩体造成损仿和动,影响其安全性与稳定性。
破坏,从而影响工程岩体的稳定性,使岩层容易剥
国内外虽然对软弱围岩隧道施工爆破展开了相
落,形成不规则断面,甚至会产生塌方。这不但会威应的研究,但对于软弱围岩连拱隧道的爆破施工
收稿日期:2013-01-23
基金项目:浙江省交通厂科技计划项目(2009166)
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