Research on vibration damping technology of underwater blasting in concave landform
In order to deeply investigate the influence of different parameters of damping holes on the surface vibration in the case of underwater blasting in concave terrain,this paper is related to an immersed tube tunnel trench excavation project in Guangzhou,and simulation calculations are carried out with the help of LS-DYNA for underwater drilling and blasting.The influence of the location,number of rows,depth and distance of the damping holes on the Peak Particle Velocity(PPV)and damping rate of the plasmas on the surface of the river bank during underwater drilling and blasting in concave terrain is emphasized.The results show that the surface vibration of the riverbank is the result of the synergistic effect of water shock waves and seismic waves,water shock waves on the riverbank vibration plays a dominant role;vibration damping holes arranged in the vicinity of the source of the explosion basically has no vibration damping effect,the vibration damping rate of 26.6％when arranged around the monitoring point,passive isolation is more suitable for concave geomorphology than the active isolation of the underwater blasting;the PPV of the surface measurement points with the increase in the number of rows of vibration damping holes is a trend of reduction;increase the depth of damping The depth of the hole can significantly improve the vibration damping rate,but the enhancement effect is limited,and it is recommended that the project use shallow holes in multiple rows;vibration damping rate increases and then decreases with the increase in the distance of the damping hole from the river bank,and the damping effect is best when the damping hole is 2.5 m from the river bank.
immersed tube tunnelsvibration dampeningnumerical simulationunderwater drilling and blasting
万方数据
维普
