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| EXPERIMENTAL AND THEORETICAL STUDIES OF CREEP DAMAGE BEHAVIOR OF SOFT ROCK |
| TIAN Hongming，CHEN Weizhong，TIAN Tian，WANG Hui，ZHAO Wusheng |
(State Key Laboratory of Geomechanics and Geotechnical Engineering，Institute of Rock and Soil Mechanics，
Chinese Academy of Sciences，Wuhan，Hubei 430071，China) |
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Abstract When tunnelling in high geostress region，the surrounding rock is often subjected to high geostress，and the increasement of deformation and creep damage for surrounding rock will show clear time effects and nonlinearity. The creep damage evolution of rock is related to its dilatancy which is caused by development of internal mico-crack of rock，and by analyzing the damage energy dissipation in process of dilatancy，a new creep damage evolution equation is established. The creep model of ABAQUS is amended by introducing the creep damage factor，and a new nonlinear creep damage model is obtained. This model is used to analyse the result of triaxial creep test for red sandstone which is got from Yichang—Badong expressway. The back analysis results show that the creep model can describe decay creep，stability creep and accelerate creep of rock in triaxial creep test.
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Received: 02 August 2011
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2012, Vol. 31 
