1. College of Civil Engineering, Fuzhou University, Fuzhou 350116, Fujian, China; 2. Fuzhou Planning & Design Research Institute Group Co., Ltd., Fuzhou 350108, Fujian, China
Abstract: To clarify the equivalent blasting load for the periphery hole with air-deck charge, the refined numerical model for two contour holes with air-deck charge was established on the LS-DYNA platform, and the instantaneous blasting process was carefully simulated through fluid-solid coupling algorithm. As for the charge section, the surrounding rock were crushed immediately due to the intensive blasting pressure, while the tensile stress due to the superstition of two blasting pressures produced the main crack along centerline. The pressure time-histories along centerline were triangle-shaped, and the peak value attenuated sharply with blasting distance. As for the air section, no crush zone appeared surrounding the hole, while the superimposed tensile stress could still produce the main crack along centerline. Comparing to the charge section, the pressure time-histories along centerline were characterized by multi-peaks, while the peak value decreased substantially and the duration increased notably. The peaks of real blasting load were averaged along centerline, which yielded the equivalent blasting load with ladder-type. The equivalent blasting load reflected the main features of real blasting load in a simplified way, which could provide some technical supports for the further numerical simulation about far-field vibration.
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2022, Vol. 4 
