黏性土包气带中流体迁移规律

发布时间：2018-05-01 22:00

本文选题：包气带 + 黏土　；参考：《水文地质工程地质》2016年01期

【摘要】：以黏土模拟低渗透包气带环境,探究了混溶流体在包气带中的迁移规律。实验结果表明:混溶流体在横向和垂向的最大迁移距离与流体泄漏量均符合幂函数变化规律y=axb。随着流体注入体积的增加,横向和垂向迁移距离不断增大,迁移速率逐渐减小。文章提出以横纵比作为反映流体在包气带中迁移变化规律的重要指标。横纵比总体呈下降趋势,具体分为两个阶段:流体注入体积为0~3 046 m L时,横纵比呈先上升后稳定的趋势,横纵比大于1。此阶段流体以横向发育为主,污染羽剖面呈扁平状椭圆;当流体注入体积大于3 046 m L,横纵比逐渐减小到1以下并持续减小。此阶段流体以垂向发育为主,污染羽剖面逐渐转变为竖直长条状椭圆。
[Abstract]:The migration of miscible fluid in low permeability aeration zone was studied by using clay to simulate the environment of low permeability aeration zone. The experimental results show that the maximum migration distance and leakage rate of miscible fluid in transverse and vertical directions are in accordance with the law of power function variation. With the increase of the volume of fluid injection, the lateral and vertical migration distance increases and the migration rate decreases. In this paper, the transverse to longitudinal ratio is used as an important index to reflect the law of fluid migration in the aeration zone. The ratio of transverse to vertical shows a downward trend, which is divided into two stages: when the volume of fluid injection is 3 046 mL, the ratio of cross to longitudinal increases first and then stabilizes, and the ratio of horizontal to vertical is greater than 1. In this stage, the fluid is mainly transversely developed, and the contamination plume profile is flat ellipse, and when the volume of fluid injection is larger than 3 046 mL, the ratio of transverse to longitudinal gradually decreases to less than 1 and continues to decrease. In this stage, the fluid is mainly developed vertically, and the pollution plume profile is gradually transformed into a vertical strip ellipse.
【作者单位】：吉林大学环境与资源学院;
【基金】：国家自然科学基金项目资助(41272256) 北京市高校创新能力提升计划项目资助(TJSHG201310772028) 环保公益性行业科研项目资助(201409030)
【分类号】：P641.2

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