Evaluation of the overstressing on rock support system based on dynamic feedback analysis
Based on the the overstressing on rock support system in the excavation of tailwater surge chamber of Yangfanggou hydropower station,combined with on-site geology,support scheme and moni-toring scheme,the dynamic feedback analysis model is established.Analysis results show that the main reason for the overstressing on rock support system is,on one hand,local unloading and relaxation caused by the exposure of dominant joints with middle and high angles on the side wall and along the chamber.On the other hand,the construction blasting exerts great influence on the bolt stress as the monitoring instruments are close to the excavation boundary.By analysis and according supplementary support,the deformation and bolt stress of the area tend to converge.The evaluation method can be used to analyze the the overstressing on rock support system.
万方数据
维普
