›› 2013, Vol. 34 ›› Issue (8): 2143-2150.

• Fundamental Theroy and Experimental Research • Previous Articles     Next Articles

Study of joint shearing component constitutive model and dual safety factors for jointed rock slope

SONG Dong-ri, REN Wei-zhong, HUANG Cheng, WANG An-li, ZHANG Jun   

  1. State Key Laboratory of Geomechanics and Geotechnical Engineering, Institute of Rock and Soil Mechanics, Chinese Academy of Sciences, Wuhan 430071, China
  • Received:2012-11-27 Online:2013-08-12 Published:2013-08-13

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Abstract: The shear stress of a rock joint is composed of three components triggered by anti-shear effect, dilatancy effect, and frictional effect under normal load and shear load; but the three components will not exert their maximum at the same point in the shear process of a rock joint. Firstly, the five main engineering geological properties of rock slope joints are analyzed in detail, which will provide engineering conditions for the component constitutive model. A component constitutive model of rock joints is presented and its characteristics are as follows: (1) The coupling effect between dilation and shearing is considered. (2) The component constitutive model has obvious physical meanings. (3) Each component is composed with a simple function, so segmental fitting functions are not needed. Furthermore, based on the component constitutive model of rock joints, the concept and solving principle of dual safety factors for jointed rock slope are put forward, which will directly show the physical process from shear failure to residual strength. The three components’ contribution to the slope stability is clarified by a calculation example.

Key words: rock slope, joint, component constitutive model, dilation, dual safety factors

CLC Number: 

  • TU 452
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