Geomechanics and Engineering

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The mechanical properties of rock salt under cyclic loading-unloading experiments

  • Chen, Jie (State Key Laboratory of Coal Mine Disaster Dynamics and Controls, Chongqing University) ;
  • Du, Chao (China Southwest Geotechnical Investigation & Design Institute CO., LTD.) ;
  • Jiang, Deyi (State Key Laboratory of Coal Mine Disaster Dynamics and Controls, Chongqing University) ;
  • Fan, Jinyang (State Key Laboratory of Coal Mine Disaster Dynamics and Controls, Chongqing University) ;
  • He, Yi (State Key Laboratory of Coal Mine Disaster Dynamics and Controls, Chongqing University)
  • Received : 2015.04.23
  • Accepted : 2015.12.29
  • Published : 2016.03.25
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Abstract

Rock salt is a near-perfect material for gas storage repositories due to its excellent ductility and low permeability. Gas storage in rock salt layers during gas injection and gas production causes the stress redistribution surrounding the cavity. The triaxial cyclic loading and unloading tests for rock salt were performed in this paper. The elastic-plastic deformation behaviour of rock salt under cyclic loading was observed. Rock salt experienced strain hardening during the initial loading, and the irreversible deformation was large under low stress station, meanwhile the residual stress became larger along with the increase of deviatoric stress. Confining pressure had a significant effect on the unloading modulus for the variation of mechanical parameters. Based on the theory of elastic-plastic damage mechanics, the evolution of damage during cyclic loading and unloading under various confining pressure was described.

Keywords

Acknowledgement

Supported by : National Natural Science Foundation of China

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