浅埋隧道爆破施工对邻近水坝安全的影响分析  

Analysis of Impact of Blasting Construction in Shallow Tunnel on Adjacent Dam Safety

作　　者：王俊[1] 张继春[1] 潘强[1] 邹新宽[1] 沈明森 李鹏川 

机构地区：[1]西南交通大学土木工程学院,成都610031 [2]四川省机场集团有限公司,成都610202

出　　处：《爆破》2017年第2期127-131,共5页Blasting

基　　金：国家自然科学基金项目(41272321)

摘　　要：隧道开挖爆破振动对邻近建构筑物安全造成的影响不容忽视。以成贵高铁豆子湾浅埋隧道下穿既有水库段(近接水库坝体)施工为背景,通过对地表及坝体的现场振动监测,分析爆破地震波的振动特征及衰减规律,并采用水工规范振动控制标准对坝体振动安全进行分析。结果表明:受夹制作用和装药集中程度等因素影响,浅埋隧道掏槽爆破时振动最为强烈;控制掏槽孔装药量、合理的掏槽孔布置和装药结构是决定隧道开挖爆破震害的关键;隧道爆破施工时坝体顶部最大的振动速度仅为0.45 cm/s,远小于坝体允许爆破振动速度,故采用台阶法进行隧道开挖爆破施工可以确保坝体安全。The effect of tunnel excavation blasting vibration on the safety of adjacent buildings and structures can＇t be ignored. Based on Douziwan shallow tunnel in the Chenggui high-speed rail,which underpass the reservoir section as the background adjacent to the dam,through the monitoring of the vibration on the ground and the dam body, the characteristics and attenuation law of blasting vibration wave are analyzed, and the vibration safety of the dam is analyzed by using the hydraulic vibration control standard. The analysis results show that the tunnel vibration by cut blasting is the strongest, due to the influence by the press and charge concentration. Controlling the explosive payload of cut blasting, reasonable layout of cut hole and charge structure are the key for tunnel excavation blasting earthquake damage. At the top of the dam body, the maximum vibration speed during the shallow tunnel blasting ex- cavation is only 0.45 cm/s, which is much less than the allowable values of the blasting vibration speed, thus the bench method for tunnel excavation blasting construction can ensure the safety of the dam.

关 键 词：浅埋隧道 开挖爆破 衰减规律 坝体安全 

分 类 号：TV542[水利工程—水利水电工程]