In channel dredging engineering,the underwater drilling and blasting technology is often used for underwater reefs higher than the designed bottom elevation.However,after drilling and blasting,there are still some rocks that cannot be completely removed and irregular and unstable underwater shallow points remaining.In actual construction,emulsified explosive is often used to remove such isolated stones.Compared with drilling and blasting,adobe blasting has small contact surface between explosive and rock face,large amount of explosive,low energy utilization rate,high explosive consumption,large noise and water shock wave,affecting ecological environment and so on.In order to analyze the influencing factors of shallow blasting,field monitoring research was carried out to compare the adobe blasting underwater and the drilling & blasting method.Under the same effect,the water hammer wave and seismic wave data of CO2 adobe blasting,drilling CO2 gas blasting and drilling emulsion explosive blasting were obtained.In this paper,taking the foundation groove,berthing excavation,reef blasting and reef clearing project of 18#~22# berth wharf in Fangchenggang as examples,the arrangement and amount of charge are formulated according to the property of rock strata,rock formation,water depth and shallow point thickness of the blasted rock top.The results show that the overpressure of CO2 adobe explosion is 1.87~41.9 times that of CO2 drilling gas explosion under the same cylinder condition.The overpressure of underwater drilling emulsion explosive blasting is 7.9~18.7 times of the water shock wave of CO2 drilling gas explosion,and the vibration value is 3~10 times of the latter.Based on the research on the propagation law of underwater blast wave,this paper comprehensively analyzes the harmful effect of underwater shock wave.市重点研发计划(防科AB21014001、防科AB20014013); 广西交通运输行业重点科技项目(桂交便函〔2022〕174号)