In order to further study the propagation characteristics of surge wave induced by underwater blasting loads,the multi-physical field coupling simulation method powered by the dynamic analysis software COMSOL was adopted to establish a transient solution model based on the second water source project-diversion project of Guilin City.The isosurface,peak stress and vibration velocity of surge wave under explosion load were studied and evaluated based on field monitoring results.The results show that the surge wave produced by underwater blasting essentially propagates around the center of the blast center,and the surge isosurface evolves from regular round to irregular ellipsoid with time.The surge waves decay rapidly during propagation,and with the increase of water medium velocity threshold,the influence range of surge wave action region is small.In addition,the stress of the surge wave has superposition effect under the condition of delayed blasting,and thus there are multiple peaks.When the distance to blast center increases from 28 m to 108 m,the attenuation rate of the peak vibration velocity of the surge wave reaches 96.3%,which has little effect on the structure.Meanwhile,the time of the peak velocity of the surge wave increases gradually with the increase of the distance to blast center.究开发计划重点课题(2017G007-D、2017G008-J); 中国中铁股份有限公司科技研究开发计划重点课题(20192001)