›› 2011, Vol. 32 ›› Issue (2): 363-368.

• Fundamental Theroy and Experimental Research • Previous Articles     Next Articles

Coupled elastoplastic-damage model for salt rock

FANG Jing-nian1, ZHOU Hui1, HU Da-wei 1, 2, SHAO Jian-fu 1, 2, LIANG Yu-lei1   

  1. 1. State Key Laboratory of Geomechanics and Geotechnical Engineering, Institute of Rock and Soil Mechanics, Chinese Academy of Sciences, Wuhan 430071, China; 2. Laboratory of Mechanics of LILLE, UMR 8107 CNRS, EUDIL-USTL, Polytech-Lille, 59655 Villeneuve d’Ascq, France
  • Received:2009-06-25 Online:2011-02-10 Published:2011-02-16

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Abstract:

Mechanical model is the basis for analysis of energy deposit engineering stability in salt seam; and the coupled damage and plasticity mechanism is the basic mechanical behavior of rock salt. Using rock salt from Yun-Ying, triaxial compression tests are performed under different confining pressures; and the deformation characteristics of salt rock are analyzed. Based on a brief account of experimental investigation, a coupled elastoplastic-damage model for salt rock is proposed. The model can describe the coupled relations between plastic deformation and damage evolution; and also a non-associated rule is preferred in order to describe a transition of plastic volumetric strain from compressibility to dilatancy. A simulation case is conducted to investigate the deformation processes of salt rock under triaxial compression; and the results show that the numerical simulations perfectly agree with the experimental data; so it is shown that the proposed coupled elastoplastic damage model is able to describe the main mechanical and deformation properties of salt rock.

Key words: salt rock, mechanical model, elastoplastic damage coupling

CLC Number: 

  • TU 452
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