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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 impurity content on the mechanical behavior and infiltration characteristics of rock salt, gas permeation experiments were carried out on the rock salt with different impurity content in the whole process of triaxial compression. The results show that the peak stress of salt rock increases gradually and the peak strain decreases gradually with the increase of impurity content under gas infiltration, and the stress-strain curve shows the vertical axis “shrink” at strain zero point. Pressure changes will have an impact on the permeability of rock salt, when the impurity content is less than or equal to 50%, the impact of confining pressure is more affected than the influence of impurities, and when the impurity content is greater than 50%, the influence of impurity content is larger than confining pressure; Increasing makes the salt rock permeability decreases, the permeability of the minimum forward, and the range of impurities affected by the forward expansion; confining pressure increases so that the impact of impurity stress at the peak stress and stress at zero penetration The difference between the rates becomes larger, and the increase of the impurity content increases the permeability at the peak.