loading page

Investigations on Structural Evolution Characteristics during Crack Self-Healing of Damaged Rock Salt
  • +2
  • He Chen,
  • Liu Wei,
  • Hui Hua Peng,
  • Jiang Deyi,
  • Rong Liu
He Chen
Chongqing University State Key Laboratory of Coal Mine Disaster Dynamics and Control

Corresponding Author:[email protected]

Author Profile
Liu Wei
Chongqing University State Key Laboratory of Coal Mine Disaster Dynamics and Control
Author Profile
Hui Hua Peng
Hunan Institute of Engineering
Author Profile
Jiang Deyi
Chongqing University State Key Laboratory of Coal Mine Disaster Dynamics and Control
Author Profile
Rong Liu
Chongqing University State Key Laboratory of Coal Mine Disaster Dynamics and Control
Author Profile

Abstract

To study the mechanism and process characteristics of self-healing of salt rock damage, the shear test was used to conduct initial damage to the samples. Then, the experiment of self-healing recovery damaged salt rock is designed. Computed Tomography (CT) tests, Scanning Electron Microscope (SEM) tests and theoretical analyses have been performed to study the characteristics of recovery of the damage salt rock during self-healing. The experimental results showed that the crack of the damaged salt rock have a good healing effect after short-term (such as 7 days) immersion in saturated brine. But in this healing process, brine has two mechanisms of action. When the soaking time is less than the threshold, the mechanism of brine action is softening, which leads to the decrease of recovery rate of the salt rock. However, while the soaking time exceeds the threshold, the mechanism of brine action is healing and recovery.