含杂质盐岩加载全过程的渗透试验研究

发布时间：2018-04-26 03:02

本文选题：杂质 + 盐岩　；参考：《岩土力学》2017年S1期

【摘要】：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。
[Abstract]:In order to investigate the influence of impurity content on the mechanical behavior and permeability of salt rock, the gas permeation test of salt rock with different impurity content was carried out in the whole process of triaxial compression. The results show that the increase of impurity content makes the peak stress of salt rock gradually increase and the peak strain gradually decrease, and the stress-strain curve shows the state of "contraction" of the vertical coordinate at the zero point of strain. The change of impurity content and confining pressure will affect the permeability of salt rock. When impurity content is less than or equal to 50, the influence of confining pressure is greater than that of impurity, and when impurity content is greater than 50, the influence of impurity content is greater than confining pressure. With the increase of confining pressure, the permeability of salt rock decreases, the minimum permeability moves forward, and the range affected by impurity expands forward. The increase of confining pressure makes the difference between the permeability at the peak stress and the permeability at the stress zero become larger, and the permeability at the peak increases with the increase of impurity content.
【作者单位】：四川大学水力学与山区河流开发保护国家重点实验室;四川大学水利水电学院;四川省水利水电勘察设计研究院;国网新疆电力公司经济技术研究院;
【基金】：国家自然科学基金项目(No.51374148,No.51641405) 四川省青年基金项目(No.2017JQ0003)~~
【分类号】：TV223

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