Abstract：With the extensive application of digital electronic detonator and hole-by-hole initiation technology in open pit mining，the stress wave interaction of adjacent double holes has become a research hotspot in the field of blasting technology. In this paper，a double-hole bench model with a proportion of 1/50 to typical full-scale bench is designed from granite，an experimental system of high-speed three-dimensional digital image correlation is established，and simultaneous initiation in double-hole bench model is studied based on full-field strain，high-speed photographic image and stress wave distribution characteristics. The preliminary experimental results show that the horizontal principal strain concentration area occurs prior to the vertical principal strain concentration area. The surface crack evolution process of the bench model is obtained based on the high-speed photographic images，and then a method to determine the initiation time and location of the horizontal crack is proposed. In order to investigate the influence of the out-of-plane movement of the bench surface on the deformation measurement，the analysis results of 3D-DIC and 2D-DIC are compared, and it is found that the maximum strain error at a single measuring point is about 3.6%. The charge affects the horizontal crack initiation time，the horizontal crack opening angle and the total number of cracks. Finally，the stress wave distribution of simultaneous initiation of double-hole bench model is analyzed.
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2020, Vol. 39 
