›› 2013, Vol. 34 ›› Issue (10): 2954-2960.

• Geotechnical Engineering • Previous Articles     Next Articles

Application of strain softening model to tunnels based on Hoek-Brown strength criterion

SUN Chuang, ZHANG Xiang-dong, LIU Jia-shun   

  1. School of Civil Engineering and Transportation, Liaoning Technology University, Fuxin, Liaoning 123000, China
  • Received:2012-03-29 Online:2013-10-09 Published:2013-10-18

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Abstract: Based on the Hoek-Brown strength criterion and geological strength index (GSI) surrounding rock rating system, rock strength weakening behavior is analyzed, a method to determine the rock peak and the peak strength parameters is summarized, a simplified calculation method for the strain-softening model is proposed. By using FLAC3D numerical simulation software, and based on convergence constraint method, the stability of surrounding rock and the support in buried large section tunnel are analyzed, and the safety factor for supporting structure is calculated. The results show that: with the release of the rock stress, rock softening parameter decreases and strength weakening behavior becomes severe. Although the high GSI (GSI = 75) for rock, strength weakening is serious, the deformation is still small. For low GSI (GSI = 25) of the rock showing the perfect elastoplastic behavior. The proposed simplified Hoek-Brown strain-softening model is suitable for the tunnel close to the rock section of the surrounding rock. The convergence constraint method is applied to analyzing the stability of surrounding rock and support, which could provide a reference for initial support to optimize the design and safety evaluation in tunnels.

Key words: Hoek-Brown strength criterion, geological strength index(GSI), strain softening, convergence-constraint method

CLC Number: 

  • U 45
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