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Finite element model methodology for asphalt-coated anchor used in underground main powerhouse anchored-on-rock crane girder

  • Tunnel Engineering
  • Published:
KSCE Journal of Civil Engineering Aims and scope

Abstract

Uncoated or grout-coated rock anchoring systems are used in underground engineering to increase the carrying capacity of surrounding rock. 3D modeling has been used to simulate grout-coated anchor characteristics, but for less common coatings, e.g., asphalt, existing Finite Element (FE) models contain too many nodes and elements to be computationally efficient. Using AutoCAD and OpenGL visual FE modeling, a methodology is proposed for asphalt element generation in FE models; FORTRAN is used to rewrite the model file information and reduce the number of model elements and nodes while boosting modeling and computational efficiency. Implicit lever and column elements are introduced to simulate anchors with and without asphalt coatings, respectively, and appropriate stiffness matrices and iterative FE calculation formulas are derived. The resulting FE model is used to simulate the anchoring system. Results show that the asphalt coating technique reduces the surrounding rock wall’s damage zone and increases anchor stresses inside deep rock masses. This can improve the rock mass mechanical characteristics near the anchors and increase the stabilities of the surrounding rock and the safety crane girder. The proposed calculation and grid re-meshing method shows good adaptability and practicality, and can serve as a reference for similar FE analysis processes.

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Authors and Affiliations

  1. State Key Laboratory of Water Resources and Hydropower Engineering Science, Wuhan University, 8 East Lake Road, Wuchang District, Wuhan City, China

    Dongdong Li, Ming Xiao, Juntao Chen & Jian Zhao

Authors
  1. Dongdong Li
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  2. Ming Xiao
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  3. Juntao Chen
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  4. Jian Zhao
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Correspondence to Ming Xiao.

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Li, D., Xiao, M., Chen, J. et al. Finite element model methodology for asphalt-coated anchor used in underground main powerhouse anchored-on-rock crane girder. KSCE J Civ Eng 21, 2476–2487 (2017). https://doi.org/10.1007/s12205-017-0809-1

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  • DOI: https://doi.org/10.1007/s12205-017-0809-1

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