In order to make a thorough understanding of the key features of Non-Darcian seepage problems,main issues in researches of Non-Darcian flow were systematically reviewed in two aspects:the mechanisms and constitutive equations of Non-Darcian flows. The mechanisms of Non-Darcian flows were considered both physiochemical and mechanical interactions between seeping fluids and porous media, except for errors raised from test procedures. The constitutive equations for Non-Darcian flows can be divided into two categories:equations for flows under lower seepage velocity for soils and that for flows at high Reynolds's number, which defines the flows out side of both lower and upper limits for Darcian flow respectively. The tendency of researches and more key issues in Non-Darcian flows were also outlined for further investigation.%为全面认识非达西渗流问题特性,对非达西渗流的产生机理和本构方程进行了比较系统的总结和评述.非达西渗流的主要机理,除试验误差外,主要是源于流体与孔隙介质之间的物理化学作用和机械性相互作用. 各种非达西渗流本构方程可分为低渗透速度的达西渗流下限方程和高雷诺数的达西渗流上限方程两类. 提出了非达西渗流研究需要探讨的若干主要问题,展望了其研究发展趋势.
展开▼
