第九章渗流讲解.ppt

1 * 1 Fluid Mechanics Chapter 9 Seepage Flow §9-1 Introduction §9–2 Section 1 Basic law of seepage flow §9-3 Uniform and non-uniform flow of groundwater §9-4 Well and catchment passage 第九章 渗 流 §9-1 引 言 §9–2 渗流基本定律 §9-3 地下水均匀流和非均匀流 §9-4 井和集水廊道 Chapter 9 Seepage Flow Seepage flow occurs during fluid flows through porous medium ,Mechanics of seepage flow is the study of fluids movement law in porous media. It is one of offsets of Mechanics of fluids, a subject developed by mechanics of fluids, medium theory, physics and chemistry, biology. Seepage phenomenon is common in nature and artificial materials. Such as seepage of groundwater, hot water and brine ;seepage of oil, natural gas and coal seam gas;seepage of blood micro-circulation and micro-bronchia in animals; transportation of water,gas and sugar in plant; seepage of pottery, tile and so on artificial porous materials. §9-1 Introduction 第九章 渗 流 渗流是流体通过多孔介质的流动，渗流力学就是研究流体在多孔介质中运动规律的科学。渗流力学是流体力学的一个分支，是流体力学与介质理论、表面物理、物理化学以及生物学交叉渗透而发展起来的一门边缘学科。 渗流现象普遍存在于自然界和人造材料中。如地下水、热水和盐水的渗流；石油、天然气和煤层气的渗流；动物体内的血液微循环和微细支气管的渗流；植物体内水分、气体和糖分的输送；陶瓷、砖石、砂模、填充床等人造多孔材料中的渗流等。 §9-1 引 言 Mechanics of seepage is widely applied in application science and project technology.Such as mechanics of soil,subterranean hydrology ,oil engineering, terrestrial heat engineering and micro-mechanism and so on. Furthermore, it is also involved in national defense industry,such as study of gas mask . Characteristic of seepage flow:first, the area of unit volume space is very large in porous medium, surface action is distinct, viscous action is considered to any body and anytime ; second, the pressure is large in subterranean seepage flow, so,the compressibility is usual considered; third, the complexity of hole,large resistance, capillary effect and force of molecular ; fourth, complicated process of physics and chemistry 。 渗流力学在很多应用科学和工程技术领域有着广泛的应用。如土壤力学、地下水文学、石油工程、地热工程、给水工程、环境工程、化工和微机