Abstract：During the construction of Xiluodu hydroelectric station，three parallel training tunnels with great height and span shape are excavated in the right bank，and those tunnels are close with each other. It is inevitable for many work faces to operate at the same time. Thus，the important problem of safety is presented by blasting interference and complicated constructing conditions. Based on maintaining stabilization of rock mass and reducing the cost of support，in-situ experiments of blasting vibration are carried out in the groups of tunnels. According to test data，the rules of transmission of blasting vibration wave are studied in the excavating own and adjacent tunnel. The results show that there are some differences in the rules of transmission of blasting vibration between own and adjacent tunnels when excavating own tunnel，in which the vibrating velocities of particles in the adjacent tunnel hold magnifying effect. Moreover，the velocity magnifying effects between inside and outside walls of the adjacent tunnel are different，and the velocity magnifying effect of inside wall is weaker in the near zone and stronger in far zone compared with the outside wall. The studying results offer the guidance to the construction and design of complicated groups of tunnels and will be useful for the similar projects.
