Research on Confining Pressure Effect on Mesoscopic Damage of Rock Salt Based on CT Scanning

Conference paper

Abstract

The Rock salt is the optimal surrounding rock of underground energy storage, so its damage is directly related to the impermeability and stability of the storage. In this study, CT scanning technique was used to analyze the microscopic damage characteristics of rock salt, which damaged under the three-dimensional stress state. The distribution and evolution characteristics of porosity, crack area, crack volume and crack quantity of damaged rock salt under different confining pressures were obtained. The results revealed the confining pressure effect of the mesoscopic damage of rock salt. With the increase of confining pressure, the quantity and size of cracks in rock salt gradually decreased. The confining pressure of 10 MPa is the turning point where the porosity decreased from fast to slow and the failure characteristics of rock salt changed from the apparent shear failure surface to the surface micro cracks.

Keywords

Rock salt CT scanning Microscopic damage Confining pressure effect 

Notes

Acknowledgments

The authors are grateful for the financial support from the National Natural Science Foundation of China (Grant No. 51374148, No. 51641405), Sichuan Youth Science and Technology Fund (Grant No. 2017JQ0003). The authors wish to offer their gratitude and regards to the colleagues who contributed to this work.

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Copyright information

© Springer Nature Singapore Pte Ltd. 2018

Authors and Affiliations

  • Lu Wang
    • 1
  • Jianfeng Liu
    • 2
  • Huining Xu
    • 2
  • Yangmengdi Xu
    • 2
  1. 1.School of Civil Engineering, Architecture and EnvironmentXihua UniversityChengduChina
  2. 2.State Key Laboratory of Hydraulics and Mountain River EngineeringSichuan UniversityChengduChina

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