爆破振动对既有隧道安全影响分析  

Impact of Blasting Induced Vibration on the Safety of an Existing Tunnel

作　　者：周林立 许俊 严赫 ZHOU Linli;XU Jun;YAN He(College of Civil Engineering and Architecture,Guilin University of Technology,Guilin 541004)

机构地区：[1]桂林理工大学土木与建筑工程学院

出　　处：《土工基础》2019年第5期550-554,共5页Soil Engineering and Foundation

摘　　要：在天长岭隧道施工过程中,确保临近既有隧道的安全,运用现场爆破监测技术对临近隧道的振动速度振动主频持续时间进行监控。通过爆破数据拟合,确定不同围岩下最佳炸药用量,使既有隧道振动速度符合规范要求,对于毫秒延迟爆破,用总药量拟合爆破振速方程更符合工程要求;由于工程地质复杂多变,隧道线性施工,不同地质情况下爆破振动频率不尽相同,仅对围岩等级相同的情况下分析不同爆心距与峰值振速下既有隧道拱脚处测点爆破振动主频预测,为工程临近隧道安全爆破提供参考。During the construction of Tianchangling Tunnel,the blasting induced vibrations were monitored to ensure the safety of an adjacent existing tunnel.The primary vibration frequency and duration were evaluated.The optimum explosive dosage was determined throughout the on-site blasting data processing so that the vibration at the existing tunnel met the code requirement.For the millisecond delayed blasting method,the relationship of the blasting vibration velocity fitted with the total explosive dosage found to meet the requirements of this project.Due to the complexity of the geological conditions and the length of the tunnel construction,the range of primary vibration frequencies of the blasting induced vibration are very wide.Under the same rock mass classifications,the peak vibration velocity at the toe of the existing tunnel with various distance to the center of blasting is evaluated for the safety of the existing tunnel.

关 键 词：爆破振动 隧道 振动速度 主振频率 

分 类 号：TU443[建筑科学—岩土工程]