›› 2010, Vol. 31 ›› Issue (3): 695-701.

• Fundamental Theroy and Experimental Research • Previous Articles     Next Articles

Weakening mechanism of mechanical behaviors and failure models of rock mass containing discontinuous joints under direct shear condition

LIU Yuan-ming1，XIA Cai-chu2   

  1. 1. College of Civil Construction Engineering, Guizhou University, Guiyang 550003, China; 2. Department of Geotechnical Engineering, Tongji University, Shanghai 200092, China
  • Received:2008-07-29 Online:2010-03-10 Published:2010-03-31

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Abstract:

The mechanical behaviors of rock mass containing discontinuous joints under direct shear condition and the mechanical theory are analyzed; Lajtai’s tension failure theory of rock bridge is modified. It is proposed that the tension failure in rock bridge weakens the mechanical behavior after analyzing the stress state of rock bridge. The region of the weakened mechanical behavior is also pointed out. According to its failure process, the failure models of rock mass containing discontinuous joints are suggested. The modified failure theory of rock bridge and suggested failure models are verified through direct shear test.

Key words: rock bridge, jointed rock mass, direct shear test, Lajtai’s theory of rock bridge, failure model

CLC Number: 

  • TU 45
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