低渗透岩体饱和渗流研究进展

Advances in the research on saturated seepage flowin low permeability rock masses

  • 摘要: 低渗透介质中的水流会影响水文地质系统和地球化学系统的演化,影响石油和矿藏的形成。低渗透介质在废弃物的处置和填埋、工程安全以及环境变化方面都是非常重要的。长期以来,人们在分析中一直以达西定律为基础,却没有在符合实际的低压力梯度下对其进行验证。由于低渗透介质中的水文地质条件的复杂性以及在测量水头和孔隙流体取样上的难度,分析比较困难。通过对低渗透介质饱和渗流研究的回顾,就非达西流、多因素作用下的耦合渗流以及渗透和超滤现象进行了讨论,对影响和阻碍低渗透渗流研究的因素进行探讨,并就开展进一步研究提出了相应的建议。

     

    Abstract: Groundwater flow in low permeability media can affeect the evolution of certain hydrological and geochemical systems and can impact the accumulations for petroleum and ores too.Such low permeability media are also important in the fields of waste disposal,engineering safety and environment changes.Although the Darcy's law is usually used as a fundamental as sumption in the studies of seepage flow theory for long period,its applicability has not been well tested in the range of very low pressure gradient in conforming with reality.It is more difficult to analyze the flow in low permeability media due to the complexity of hydrogeological conditions and the difficulties of measuring hydraulic head and sampling pore fluids.This paper reviews and summarizes studies on saturated seepage flow in low permeability media and discusses non-Darcy flow,coupled seep-age flow under multi factors,as well as two important nonhydraulic flow phenomena like osmosis and ultrafiltration.The problems of affecting and hindering analysis are discussed and some suggestions are also proposed for studies.

     

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