Experimental research on properties of short-term self recovery of damaged salt rock

In order to understand the mechanical properties and short-term self recovery features of salt rock with damage under constant temperature, the self recovery tests on the salt rock with shear damage are designed, and the variation laws of related mechanical parameters with the time for recovery are studied. The test results show that the recovery of internal friction angle is obvious, and that of cohesive force is not obvious. In the early recovery stage, the shear strength decreases and then relatively increases with the to recovery, and eventually enters into the long-term recovery phase. After recovery, with the increasing ability of resistance to deformation, the deformation ability of damaged salt rock also increases. The researches on the self recovery of salt rock with damage should be divided into long-term and short-term ones, and the dividing point is about 7 d. Through the discussion and analysis of the self-healing theory, it is known that the recovery is the strengthening of mechanical properties and improvement of comprehensive quality, sometimes along with degradation of some mechanical properties. By fitting the damage variables, the variation of damage values of damaged specimens in the process of self healing is released.