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Abstract The creep behaviour is an important parameter to estimate the feasibility and safety of underground gas storage in rock salt caverns. The paper mainly presents an experimental study about the creep behaviour of Jintan rock salt by means of the digital image correlation(DIC) techniques，which not only can give a full-field strain，but also can follow the evolution of the microstructure of the material. The two symmetrical surfaces of the cubic samples have been investigated during the creep test by two digital cameras. The results show that the strain rate in stable creep is about 10－9 s－1 at the axial stress of 11 MPa. The dependence of the strain rate upon the stress，time-dependent damage and the relation between this dependence and the microstructure are discussed.
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Received: 30 March 2011
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2011, Vol. 30 
