尾矿库排洪隧洞与采石场开采相互影响安全性研究

湖南某钨矿尾矿库加高扩容工程次年新建排洪隧洞穿过采石场下方，隧洞开挖与采石场开采对双方的安全性产生影响，需要开展安全性评价。为此分析了排洪系统与采石场的相互位置关系，通过室内试验得出采石场周围岩体的力学参数，采用有限元数值模拟方法分析了排洪隧洞开挖对采石场安全影响，得出排洪隧洞开挖影响范围为7.5~12.5 m，不会对采石场生产早晨安全造成影响；依照规程规范分析了采石场爆破振动对排洪隧洞的影响，得出在采石场目前生产区域采用中深空爆破或浅孔爆破，排洪隧洞处的振动速度分别为12.1 cm/s、10.1 cm/s，在允许安全值内；在采石场设计范围最底部台阶爆破时，爆破药量须控制在25 kg以内。研究结果为今后尾矿库排洪系统及采石场的正常运行提供有利的依据。

Research on the Mutual Influence Safety of Flood-discharging Tunnel and Quarry in Tailing Pond

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.