In order to study the dynamic response characteristics of adjacent roadway under blasting action, taking the adjacent roadway of a mine as the engineering background, the 3DEC discrete element simulation software was used to establish a bonded block model considering the discontinuous characteristics of rock mass. The vibration velocity field, stress wave propagation and fracture evolution law of surrounding rock of adjacent roadway under blasting load were simulated, and the response characteristics of the surrounding rock under different blasting rising time was analyzed. The results show that the short rising time makes the energy of blasting wave release intensively, which leads to the high peak vibration velocity of surrounding rock particles, but the attenuation is rapid. The long rising time makes the energy distribution more uniform, but the peak vibration velocity of surrounding rock particles decreases significantly, and the cumulative damage to surrounding rock is more significant. The evolution of fracture fractal dimension presents two-stage characteristics, which increases sharply in the early stage of blasting and increases slowly in the later stage. The long rising time has a stronger promoting effect on the expansion of surrounding rock damage range. Based on the stress wave propagation and the distribution law of the peak particle velocity of the surrounding rock, the short rising time is suitable for efficient blasting scenarios, while the long rising time needs to be combined with charge control to reduce the damage of the surrounding rock. The research results provide a theoretical basis for the safety design and construction control of blasting excavation in adjacent roadways.

Adjacent roadway  /  Blasting action  /  Rising time  /  Fractal dimension  /  Discrete element simulation