某水电站地下厂房喷锚支护数值模拟

Numerical Simulation of Sprayed Anchor Support in Underground Powerhouse of a Hydropower Station

建立某水电站地下厂房洞室群区域三维数值模型,利用FLAC3D软件模拟无支护和喷锚支护两种工况下分层开挖的施工过程。对两种工况下围岩应力、位移和塑性区分布特征进行分析,认识喷锚支护对围岩稳定性的影响。分析结果表明,喷锚支护能够有效地控制围岩变形和塑性区分布深度,减小应力集中区的范围,提高围岩整体稳定性。

This paper established a three-dimensional numerical model of cavern cluster in the underground powerhouse of a hydropower station. FLAC3 D software had simulated the construction process of layered excavation with no support and sprayed anchor support.This paper analyzed the distribution characteristics of surrounding rock under two conditions, including stress, displacement and plastic zone. It could realize the influence of sprayed anchor support on surrounding rock stability. The results showed that sprayed anchor support could effectively control the deformation of surrounding rock and the distribution depth of plastic zone, which would reduce the stress concentration zone and improve the overall surrounding rock stability.