(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:The inclined long bolts for the crane beam being anchored in rock in the underground powerhouse are the important links of force transmission between the beam body and rock. A single bolt is divided into two parts: one section is surrounded by rock and another section is surrounded by the concrete of beam body. Based on the force characteristics of the bolt under the pullout load and the neutral point theory for bolts,the interactions of bolt,beam body and surrounding rock under the self-weight of beam,rock excavation load and the crane wheel were studied. A mechanical model of anchorage body including the asphalt was established. A new algorithm to calculate the forces of bolts was proposed,which is suitable for the stability analysis of crane beam anchored in rock. The numerical simulation on the force of crane beam anchored in rock during the construction and running periods was carried out with the 3D elasto-plastic nonlinear finite element method. The results of numerical simulation can reasonably reflect the stress characteristics of long bolts,and the calculated stresses in the bolts are in good agreement with the monitored values.
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