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首页> 外文期刊>Proceedings of the Institution of Civil Engineers >A historical perspective on unconfined seepage: correcting a common fallacy
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A historical perspective on unconfined seepage: correcting a common fallacy

机译：无占渗流的历史视角：纠正普通谬误

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摘要

It is commonly assumed in seepage studies for geotechnical problems that the phreatic surface (the line of zero pore water pressure) represents the upper flow line and is the boundary of the seepage zone. Seepage is assumed to occur below the phreatic surface but not above it (this is termed the 'phreatic assumption'). A brief historical review is given of the development of seepage theory and how this assumption became established. It is explained that this assumption is true only if the soil involved is coarse grained when the majority of the pore water above the phreatic surface will drain out of it under gravity forces. The assumption is not valid for fine-grained soils such as clay, in which case water is held in the soil pores by capillary forces for many metres above the phreatic surface and seepage occurs above the phreatic surface according to the same laws as below it. Examples are given of correct flow nets for unconfined seepage in clay compared with those routinely adopted in soil mechanics.
机译：潜水表面（零孔隙水线线）代表上流动线并且是渗流区的边界，普遍存在的渗流研究中的渗流研究中的渗透研究。假设渗漏发生在潜水表面以下，但不在其上方（这被称为“潜水假设”）。鉴于渗流理论的发展以及这一假设成立的简要审查。据解释，当涉及的土壤是粗粒的时候，当潜水表面上方的大部分孔水时，这种假设才是真实的，因为在重力力下将排出它。假设对诸如粘土的细粒土壤无效，在这种情况下，水在土壤孔中通过毛细管在土壤孔中保持潜水表面，并且渗漏根据与其下方的相同的法律在潜水表面上方发生。与土壤力学常规采用的那些相比，给出了用于粘土中无束缚渗流的正确流动网。

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