Rock salt sample dissolution tests under on the condition of triaxial stress with self-designed triaxial testing machine

rock salt dissolution rate orthogonal experiment under the mutual coupling of concentration

temperature

flow and deviatoric stress under the condition of triaxial stress

are carried out. Various factors influencing rock salt dissolution rate are studied. Any two factors are the binary linear regression

the relative importance ratio according to the standardized regression coefficients for rock salt dissolution rate to build judgment matrix; analytic hierarchy process is used to calculate weights of various factors. The results show that: Rock salt dissolution rate decreased rapidly with the concentration increasing. Dissolution rate increases with the temperature rising. Dissolution rate increases slowly with the flow increasing and did not change significantly. Dissolution rate decreases first and then slowly increases with increasing deviatoric stress. Range analysis and weights calculation show that primary and secondary factors affecting the rock salt dissolution rate are concentration

temperature

flow and the deviatoric stress. The weights of concentration

temperature

flow and the equivalent stress affecting the dissolution rate are 0.570

0.384

0.048

0.005 respectively; the weights of the two factors

concentration and temperature

account for 95%.