›› 2009, Vol. 30 ›› Issue (6): 1611-1614.

• Fundamental Theroy and Experimental Research • Previous Articles     Next Articles

Low cycle fatigue damage model and damage variable expression of rock

LI Shu-chun，XU Jiang，TAO Yun-qi，TANG Xiao-jun，YANG Hong-wei   

  1. Key Laboratory for the Exploitation of Southwest Resources & the Environmental Disaster Control Engineering, Ministry of Education, Chongqing University, Chongqing 400044, China
  • Received:2007-10-12 Online:2009-06-10 Published:2011-03-09

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Abstract:

In the realm of rock project, the fatigue failure characteristics of rock under cyclic load and long-term stability of rock mass are closely related. At present, researches for fatigue damage of concrete are more than that for rock, in view of this situation, using damage mechanics method, the fatigue damage variable expression based on accumulated plastic strain is analyzed; according to the theoretical shortcoming of the used damage variable expression based on accumulated plastic strain, a new rock damage variable expression method is established. At the same time, in order to study the deterioration process of rock mechanical performance under fatigue load, the damage development and deformation law of rock under fatigue load are analyzed according to continuum damage mechanics; and a low cycle fatigue damage evolution equation is deduced and established considering hardening characteristics of rock; the evolution equation reflects fatigue damage evolution rule of rock well after experimental confirmation, and it can be used for finite element analysis of rock under fatigue load.

Key words: rock, fatigue, damage, model

CLC Number: 

  • TU 458+.3
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