In order to investigate the influence of impurities on the mechanical behavior and the permeability characteristics of salt rock

different impurity contents of salt rocks are tested by the triaxial compression and penetration test .Researches show that the increased levels of impurities of salt rock will make the peak stress increase and the peak strain decrease. The stress-strain curve contracts to the zero ordinate. The changes of impurity content and confining pressure will have an impact on the salt rock permeability. When the impurity content is less than or equal to 50%

the confining pressure will have a bigger influence on salt rock permeability than the impurity content; but when the impurity content is greater than 50%

the impurity content will have a bigger influence on salt rock permeability than the confining pressure. Increasing confining pressure will forward the range of the influence on the permeability of impurity content. The increased confining pressure makes the difference between the permeability of peak stress and stress at zero point.