Research of risk analysis and control measures for vibration velocity of metro foundation pit blasting at complex stratum
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.
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