Simulation of fully grouted rock bolts using dynamic finite element for underground caverns
LIU Guoqing1，2，XIAO Ming1，2，ZHOU Hao1，2
(1. State Key Laboratory of Water Resources and Hydropower Engineering Science，Wuhan University，Wuhan，Hubei 430072，China；2. Key Laboratory of Rock Mechanics in Hydraulic Structural Engineering of Ministry of Education，Wuhan University，Wuhan，Hubei 430072，China)
Abstract：This paper proposes a dynamic algorithm for rock bolt considering interfacial shear damage of anchorage body under seismic load. Based on basic loading formulas of the anchorage body，the control equation of load transfer related to surrounding rock and the bolt is deduced and then is transformed into linear equations according to the finite difference method. Combined with the free deformation displacement of the rock，the modification is made considering interfacial damage of the anchorage body，and the displacement of the anchorage body is obtained by iteration operation. Furthermore，the distributions for normal stress and interfacial shear stress of the anchorage body along the bolt length are achieved. The rationality of the algorithm is validated with computed results from the static calculation examples and then the algorithm is applied to dynamic calculation of the engineering case study. The results show that the algorithm can effectively simulate the supporting effect of the bolts and the anchorage body stress distribution conforms to the neutral point theory. The results also indicate that the normal stress of the bolt suffers constant growth with time during the earthquake. The interface near the anchor head with large shear stress is easily subjected to damage under seismic load.
刘国庆1，2，肖 明1，2，周 浩1，2. 地下洞室全长黏结式锚杆动力有限元模拟[J]. 岩石力学与工程学报, 2017, 36(S1): 3174-3183.
LIU Guoqing1，2，XIAO Ming1，2，ZHOU Hao1，2. Simulation of fully grouted rock bolts using dynamic finite element for underground caverns. , 2017, 36(S1): 3174-3183.
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2017, Vol. 36 
