Abstract: AbstractThe new flood discharge tunnel at the heightening and capacity expansion project in a tailing reservoir of Hunan tungsten mine next year passes through the bottom of quarry. The tunnel excavation and quarry mining have an impact on the safety of both tunnel and quarry, so it is necessary to carry out safety evaluation. Therefore, the relationship between the flood discharge system and the quarry was analyzed, and the mechanical parameters of rock mass around quarry are obtained by laboratory test. The influence of flood discharge tunnel excavation on safety of quarry was analyzed by adopting the finite element numerical simulation method. It is concluded that the influence scope of flood discharge tunnel excavation is 7.5~12.5 m, which will not bring impact on quarry production. The influence of blasting vibration of quarries on flood discharge tunnel was analyzed according to the specification. It is concluded that medium-depth hole blasting or shallow blasting was adopted in the current production of quarries, and the vibration velocity at the flood discharge tunnel is 12.1 cm/s and 10.1 cm/s, respectively, within the allowable safety value. When blasting is arranged at the lowest bench under the design range of quarry, the explosive charge must be controlled within 25 kg. The research results provide a favorable basis for the normal operation of the flood discharge system and the quarry in tailings pond.

Key words: Tailings pond, Quarry, Mining, Safety