Abstract:The creep property of rock salt varies with the mineral gradients and loading level. Through creep experiments on rock salt and glauberite rock salt with different stresses and sample sizes for more than 100 days,the following results,which are elaborately described in the paper,are obtained:(1) under the same stress 7.0 MPa,the creep ratios of glauberite rock salt and rock salt are 8.72×10-6 and 2.38×10-4 d-1 respectively,and the former is only 3.67% of the latter;(2) under different stresses,the creep properties of two kinds of rock salt are different from each other. The rock salt loaded by 7.0 MPa shows a higher creep ratio,which is 2.38×10-4 d-1,while the creep ratio of the sample loaded by 4.0 MPa is 3.77×10-5 d-1,which is only 15.87% of the former;(3) under different stresses,i. e. 7.0 and 12.0 MPa,the creep ratio of glauberite rock salt is 8.72×10-6 and 1.12× 10-5 d-1 respectively. The higher the load is,the greater the creep ratio is. Finally,a creep constitutive equation of rock salt is established based on the theoretical analysis;and it fits with the obtained creep data very well. The results obtained and constitutive equation can provide some references for stability analysis of oil and gas storage constructed in bedded salt deposits.