›› 2013, Vol. 34 ›› Issue (7): 1881-1886.

• Fundamental Theroy and Experimental Research • Previous Articles     Next Articles

Study of dilatancy characteristics of salt rock under unloading action of confining pressure

JIANG De-yi，FAN Jin-yang，CHEN Jie，REN Song，WANG Zhen，BAI Yue-ming   

  1. State Key Laboratory for the Coal Mine Disaster Dynamics and Controls, Chongqing University, Chongqing 400044, China
  • Received:2012-07-30 Online:2013-07-10 Published:2013-07-15

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Abstract: The dynamic reduction of confining pressure of salt rock gas storage surrounding rock during construction period is simulated by uniaxial compression tests and triaxial unloading confining pressure tests. The effect of temperature on dilatancy characteristics of salt rock are analyzed by the unloading tests. The results show that all the tests are the process of stress increasing. Furthermore, both unloading confining pressure tests and uniaxial compression tests have similar deformation stages of dilatancy curves. The similar deformation stage includes the volume compressed segment, the stable dilatancy segment and the accelerating dilatancy segment. Those two types of tests also have the similar compressed limit. However, due to the different loading modes, the ratio of stable dilatancy in uniaxial tests is larger than that in unloading confining pressure experiments. The dilatancy rate and the value of dilatancy are smaller in unloading confining pressure tests. The unloading confining pressure tests have greater dilatancy under the same deviatoric stress. Higher temperature can promote the dilatancy of salt rock. That means the increasing of temperature can make the accelerating dilatancy point appear forward, the initial stable dilatancy segment shorter, the accelerating dilatancy segment longer, the dilatancy rate and the value of dilatancy higher.

Key words: salt rock, unloading confining pressure, dilatancy damage, temperature effect

CLC Number: 

  • TU 456
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