复杂地层地铁基坑爆破振速风险分析及控制措施研究
Research of risk analysis and control measures for vibration velocity of metro foundation pit blasting at complex stratum
叶正联 1刘立永 1周武 2周学彬 3王锋 4刘钦文3
作者信息
- 1. 中铁四局集团有限公司,安徽 合肥 230023
- 2. 深圳市市政工程质量安全监督总站,广东 深圳 518034
- 3. 中铁南方投资集团有限公司,广东 深圳 518052
- 4. 深圳地铁建设集团有限公司,广东 深圳 518026
- 折叠
摘要
文章以深圳地铁8号线三期工程小梅沙站至溪涌站工程为依托,通过数值模拟计算,研究有无减振孔对建筑物振速的影响,并分析不同减振孔设计参数下该工程减振孔的减振规律.结果表明:减振孔可以有效降低爆破振速峰值,使振动能量分布均匀,避免振动的集中和局部增强;减振孔的孔距增大时,减振孔的布置空间减少,减振效果降低;减振孔的孔径增大时,建筑物振速峰值减小,减振效果提高;减振孔的孔深增大时,减振效果提高,但当达到一定深度后,减振效果发生减弱.相关研究可为未来其他复杂地质条件下地铁基坑工程中的爆破振动控制提供参考和借鉴.
Abstract
Based on the project of Shenzhen metro line 8 phase Ⅲ from Xiaomeisha station to Xichong station,numerical simulation calculations were conducted to study the impact of the presence or absence of vibration reduction holes on the vibration velocity of buildings,and to analyze the vibration reduction principles of the project's vibration reduction holes under different design parameters of vibration reduction holes.The results show that vibration reduction holes can effectively reduce the peak value of blasting vibration velocity,distribute vibration energy evenly,and avoid concentration and local enhancement of vibration;when the spacing of the vibration reduction holes increases,the layout space of the vibration reduction holes decreases,and the vibration reduction effect decreases;when the aperture of the vibration reduction hole increases,the peak vibration velocity of the building decreases and the vibration reduction effect improves;when the depth of the vibration reduction hole increases,the vibration reduction effect increases,but when a certain depth is reached,the vibration reduction effect weakens.The relevant research can provide reference and inspiration for future blasting vibration control in metro foundation pit projects under other complex geological conditions.
关键词
地铁/基坑爆破/振速/数值模拟/减振孔/减振效果Key words
metro/foundation pit blasting/vibration velocity/numerical simulation/vibration reduction holes/vibration reduction effect引用本文复制引用
出版年
2024
NETL
NSTL
万方数据