(1. State Key Laboratory of Hydraulics and Mountain River Development and Protection，Sichuan University，Chengdu，Sichuan 610065，China；2. HydroChina Chengdu Engineering Corporation，Chengdu，Sichuan 610072，China)
Abstract：The rigid body limit equilibrium method is often used to design rock-anchored beam，but the follow-up excavation and rock deformation are not taken into account in this method. Underground power house of Jinping I hydropower station is located in the region with high underground stress(maximum value reaches 35.7 MPa). The stage excavation of the underground plant certainly has significant effect on the deformation and stress of rock-anchored beam. Compared with field monitoring deformation，3D nonlinear finite element method is used to study deformation and stress of rock-anchored beam of underground power house. The deformation and stress of rock-anchored beam are analyzed under each excavation stage. The results show that during excavation，a large scope of unstable failure and a pull rod yielding phenomenon will happen. The influencing mechanism of successive excavation to pull rod stress，and the stress variation behavior of pull rod are discussed. It is found that delaying of the fixing time of rock rod can effectively reduce the pull rod stress caused by following excavation.
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2013, Vol. 32 
