Experimental study on creep parameters of rock salt based on Burgers model

According to the time dependence of underground mining structure parameters in rock salt mine, creep test of rock salt is carried out.Through the uniaxial compression test of rock salt, its instantaneous pressure-resistance characteristics are obtained, and a reasonable creep pressure level is set accordingly.The uniaxial compression creep test is carried out by the monomer multistage loading method, and the creep deformation and time curves of rock salt in 2 groups with different buried depth are obtained.The results show that the uniaxial compression strength of rock salt has significant time weakening and the long-term strength is less than 70% of the instantaneous strength.Burgers model can reasonably describe the creep deformation characteristics of rock salt, and the fitting creep parameters can provide references for the design of underground salt mine stope structure parameters.