台山核电站爆破开挖基岩损伤分析及控制

Analysis and control of rock damage in blasting excavation of Taishan Nuclear Power Plant

核电工程在进行爆破开挖时,为保证核岛所在岩层的完整性,需控制爆点周围岩体的损伤范围。为探究岩体损伤深度与特定点振动速度之间的关系,本文结合台山核电站核岛负挖爆破工程,根据场地地质勘察资料,通过数值模拟和现场试验对岩体损伤深度与距爆源30 m处质点振动速度之间的关系进行探究。研究结果表明:台山核电爆破开挖时,岩体损伤深度随最大段药量的增加呈幂函数增加,且特定点振动速度与最大段药量之间符合萨道夫斯基公式对应关系;运用数值模拟与现场试验结果所拟合公式,提出在核岛负挖分层爆破施工中距爆源30 m处爆破控制振动速度分别为10.0、3.5、1.5 cm/s时可控制相应岩层的爆破损伤,并通过后期工程监测验证控制参数的有效性。

In order to ensure the integrity of the rock layer where the nuclear island is located,the damage range of rock mass around the explosion point should be controlled during blasting excavation of nuclear power engineering.This paper combined with the blasting excavation project of Taishan Nuclear Power Plant,based on site geological survey data,and through numerical simulation and field test,explored the relationship between rock mass damage depth and particle vibration velocity 30 m from the explosion source.The research result show that the damage depth of rock mass increases as a power function with the increase of the maximum charge during the blasting excavation of the nuclear power plant,and the relationship between the vibration velocity at a specific point and the maximum charge conforms to the Sadowski formula.By using the fitting formula of numerical simulation and field test results,it is proposed that the blasting damage of corresponding rock strata in the blasting construction of nuclear island can be controlled when the control vibration velocities of the spots 30 m away from the blasting source are 10.0,3.5 and 1.5 cm/s respectively,and the effectiveness of the control parameters is verified by later engineering monitoring.