为了探讨杂质含量对盐岩力学行为和渗透特性的影响，对不同杂质含量的盐岩进行三轴压缩全过程的气体渗透试验。研究表明，气体渗透作用下杂质含量的增加使得盐岩峰值应力逐步增大而峰值应变逐步减小，应力-应变曲线呈现出向应变零点处的纵坐标“收缩”的状态；杂质含量和围压的变化都会对盐岩的渗透率大小产生影响，当杂质含量小于等于50%时围压的影响较杂质的影响大，当杂质含量大于50%时杂质含量的影响较围压大；围压增大使得盐岩的渗透率减小，渗透率最小值前移，且受杂质影响的范围向前扩大；围压的增大使得杂质影响下的峰值应力处的渗透率和应力零点处的渗透率之间的差异变大，杂质含量的增大使得峰值处的渗透率增大。

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.