岩石光滑裂隙的渗透规律可用立方定理描述,而气孔构造岩石裂隙的渗透性却因裂隙面气孔的存在表现不同渗透规律及机理,值得深入研究。首先在海口市的火山岩地区选取了4种气孔分布有显著差异的玄武岩样品,测量其气孔特征参数后进行单裂隙渗透试验,然后引入裂隙面构造影响因子λ对试验结果做变换整理,获得了气孔构造裂隙渗透规律,最后通过数值分析,在印证室内试验所得规律合理的基础上,阐述了气孔构造对裂隙渗透性影响机理。研究结果表明:气孔构造的存在对裂隙渗流有显著影响,雷诺数较低(Re<200)时,气孔构造的存在可增加裂隙渗流流量;雷诺数较高(Re>200)时,气孔构造的存在可降低渗流流量;裂隙面构造影响因子λ与渗流雷诺数Re在一定范围内呈负指数相关。研究成果可供探明气孔构造岩石地区渗透特性时参考。
Abstract
The smooth fracture seepage flow of rock can be described by the cubic law, but the permeability of fracture in vesicular rock differs due to vesicles on two sides of the fracture surface. In this research, four kinds of vesicular basalt samples with significant differences in vesicle distribution were selected from the volcanic area of Haikou to conduct single fracture permeability test based on the vesicle characteristic parameters. Furthermore, the permeability law of vesicular fracture was obtained by transforming the test results using the influence factor (λ) of fracture surface structure. Finally, the mechanism of vesicular structure affecting fracture permeability was expounded through numerical analysis verifying the rationality of laboratory test result. The results demonstrat that vesicular structure has a significant impact on the seepage of fracture. When the Reynolds number is low (Re<200), vesicular structure boosts the seepage flow of fracture; when the Reynolds number is high (Re>200), vesicular structure hinders the seepage flow of fracture. The influence factor λ is negatively related to the Reynolds number (Re) within a certain range.
关键词
岩石光滑裂隙 /
气孔构造 /
渗透试验 /
数值模拟 /
裂隙渗流流量
Key words
smooth fracture of rock /
vesicular structure /
permeability test /
numerical simulation /
seepage flow of fracture
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基金
国家重点研发计划项目(2019YFC1904700);国家自然科学基金项目(51578230)
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