摘要
以宝汉高速爆破施工为例,通过现场监测关键质点爆破振动速度,研究爆破振动对临近既有道路的影响范围.研究结果表明,爆破振动波的主频率在10~50 Hz内,不会使周围临近既有道路与其产生共振.从现场测试结果可知,由于垂直振速大于径向振速和切向振速,且垂直振动对建筑物破坏尤为显著,故在类似工况下爆破振动监测应该以监测垂直振速为主.爆破振动波对既有道路的影响范围为30 m,与理论值相符.当浅埋大断面软弱围岩隧道下穿既有道路施工爆破的安全允许质点振动速度小于2.0 cm/s时,可确保既有道路结构和交通安全.研究可为此类隧道工程的施工提供借鉴.
By taking the blasting construction of the Baohan highway project as an example, this paper focuses on the blasting vibration influence on the existing roads nearby by monitoring the blasting vibration velocity. The results show that existing roads nearby will not resonate with the blasting when the dominant frequency of blasting vibration is between 10-50 Hz during monitoring of tunnel blasting construction. Based on the in-situ monitoring results, the vertical vibration velocity should be principally monitored because it is higher than the radial and tangential vibration velocities and it is significantly destructive to the buildings. To ensure the safety of structures and transportation of existing roads, the blasting vibration velocities of key points are supposed to be less than 2. 0 cm/s for existing roads of the shallow-buried tunnel underpass with large cross-section and soft surrounding rock. Furthermore, the monito- ring data show that the influence scope of blasting vibration wave to existing roads is about 30 m, which is consistent with the theoretical calculation. These results provide references to the general tunnel construction.
出处
《深圳大学学报（理工版）》
EI
CAS
CSCD
北大核心
2017年第3期238-244,共7页
Journal of Shenzhen University(Science and Engineering)
基金
国家自然科学基金资助项目(51679199)
陕西省科技统筹创新工程重点实验室资助项目(2014SZS15-Z01)
西安工业大学校长基金资助项目(XAGDXJJ16003)~~
关键词
隧道工程
爆破施工
爆破振动
振动速度
振动频率
既有道路
highway tunnel
blasting construction
blasting vibration
vibration velocity
vibration frequency
existing roads
