悬吊锚筋桩应用于隧洞进出口围岩加固的研究

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Abstract Because of the stability problem of rock mass is very poor in the inlet and outlet section of tunnel，so some strong reinforcement measures should be applied；and the suspensory anchor-stake is one of these effective reinforcement methods. Firstly，the numerical simulation method and the mechanical parameters for suspensory anchor-stake are analyzed；then a simple case study for parameters sensitivity analysis of suspensory anchor-stake is carried out. The computing results show that，the results are influenced by the friction effect of grout is considered or not；so that，the rational simulation of grout is very important to the numerical simulation of suspensory anchor-stake. Finally，the numerical simulation of excavation and reinforcement of section 0+015 m of diversion tunnel #1 at the Nuozhadu hydropower station under different conditions is carried out；the interaction of rock mass and suspensory anchor-stake，the deformation of tunnel crown rock mass influenced by the suspensory anchor-stake are analyzed. The computing results show that，the subsidence deformation of tunnel crown rock mass is controlled by the suspensory anchor-stake effectively.

Key words： tunnelling engineering reinforcement method suspensory anchor-stake numerical simulation stress and deformation

Received: 25 May 2011

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http://www.rockmech.org/EN/Y2011/V30/I10/2040

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