## 1 Introduction  
Blasting is an efficient method for rock excavation [1]. Therefore, it is widely used in various projects, including tunnels, mines, and hydropower stations. However, the adverse impacts of blasting also affect engineering safety, such as blast-induced vibration and blasting flyrock. It is thus crucial to accurately design blasting parameters in the same situation, considering blasting disasters are directly associated with blasting design. Many scholars have investigated the influence factors of blast-induced vibration in different projects with experimental tests and numerical simulation software. For example, [PERSON] et al. [2] revealed that peak particle velocity (\(PPV\)) and frequency are important factors for the safety of adjacent structuresthrough the examples of blasting near Olympic Stadium in Helsinki, Finland. [PERSON] et al. [3] calculated the attenuation coefficient of blast-induced vibration on open pit slopes affected by underground mining with a dynamic finite element method. [PERSON] et al. [4] found blast-induced vibration decreased sharply with the number of blast-generated free surfaces in a pumped storage power station. [PERSON] et al. [5] indicated that short-delay blasting was more advantageous to control blast-induced vibration by comparing the experimental tests of short-delay with simultaneous blasting in underground mines. [PERSON] et al. [6] ensured the safety of engineered structures against blast-induced vibration by monitoring blast-induced vibration during excavation. [PERSON] et al. [7] modified the predictive equation of _PPV_ (peak particle velocity) during multi-hole blasting through scaled distance regression analysis of blast-induced vibration in an open-pit mine. [PERSON] [8; 9] verified the significance of free surface and charge weight per delay to blast-induced vibration. [PERSON] et al. [10] indicated the safety of a water pipeline under blast-induced vibration during an adjacent subway excavation combining 3D numerical calculation and field blast-induced vibration monitoring tests. Some attempts have been made to control blast-induced vibration. [PERSON] et al. [11] reported that barrier holes could reduce blast-induced vibration by more than 18% after analyzing 121 blast-induced vibration data. [PERSON] et al. [12] established the relationship between _PPV_ and explosives charge weight per delay in nuclear power station, and found the explosives charge weight per delay was 26.3 kg in the blasting excavation. [PERSON] et al. [13] controlled blast-induced vibration within the acceptable limits by changing blast parameters, maximum explosives charge weight per delay, and initiation networks. [PERSON] et al. [14] presented an abrasive water jet cutting method that can reduce the blast-induced ground vibration more effectively than the drilling-blasting method in tunnel excavation. [PERSON] et al. [15] evaluated the accuracy of four estimation models by cross-validation with measured values and put forward that the USBM (US Bureau of Mines) and Ambraseys-Hendron prediction models were closer to real blast-induced vibration. [PERSON] et al. [16] proposed the new blast-induced vibration control approaches, which determined optimal blasting parameters through a new theoretical formula to effectively control blast-induced vibration in the admissible adopted standard. Indeed, such improvements in blast-induced vibration contributed to ensuring the safety of blasting engineering in tunnels, mines, slopes, etc. However, the investigation of blast-induced vibration in hydropower stations was rather limited. As there are many sophisticated devices and important structures in hydropower stations, it is necessary to control blast-induced vibration. In this paper, the transverse cofferdam in Xiangjiaba hydropower station was taken as an example and field tests, field measurement, and theoretical analysis were combined to systematically investigate the relationship between _PPV_, explosives charge weight per delay, and blasting parameters.