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Theory and Problems of Water Percolation. Engineering Monographs No. 8
The flow of water through dams and their foundations, and the accompanying pressures and gradients that exist, have long been recognized by engineers as important factors in dam design. This monograph is concerned with the effects of this 'percolating' water and the methods for correcting these effects when they are thought to be detrimental. Also given are several methods for determining the permeability of soils by field tests. These problems resolve themselves into a study of the slow flow of water through porous media Slow flow as used here is defined as laminar flow in which the Reynolds number is 1 or less. If the Reynolds number becomes larger than 1, it is possible for turbulence to develop. In this case, Darcy's law governing the slow flow of water through porous media, no longer applies. Darcy's law will be treated in detail under the section on general theory, which follows; but briefly, it states that the rate of flow, Q, of water through a porous medium is directly proportional to the cross-sectional area, A, and to the pressure gradient acting. There are many engineering problems to which the laws of slow flow of water apply and which, consequently, affect the design of the structures involved. Some of these problems are: 1. Percolation through concrete dams and their foundations. 2. Percolation through earth dams and their foundations. 3. Flow into drains embedded in concrete and soil. 4. Flow around cut-off walls. 5. Foundation settlement (consolidation). Most of these problems involve a knowledge of the permeability of the materials involved.
Theory and Problems of Water Percolation. Engineering Monographs No. 8
The flow of water through dams and their foundations, and the accompanying pressures and gradients that exist, have long been recognized by engineers as important factors in dam design. This monograph is concerned with the effects of this 'percolating' water and the methods for correcting these effects when they are thought to be detrimental. Also given are several methods for determining the permeability of soils by field tests. These problems resolve themselves into a study of the slow flow of water through porous media Slow flow as used here is defined as laminar flow in which the Reynolds number is 1 or less. If the Reynolds number becomes larger than 1, it is possible for turbulence to develop. In this case, Darcy's law governing the slow flow of water through porous media, no longer applies. Darcy's law will be treated in detail under the section on general theory, which follows; but briefly, it states that the rate of flow, Q, of water through a porous medium is directly proportional to the cross-sectional area, A, and to the pressure gradient acting. There are many engineering problems to which the laws of slow flow of water apply and which, consequently, affect the design of the structures involved. Some of these problems are: 1. Percolation through concrete dams and their foundations. 2. Percolation through earth dams and their foundations. 3. Flow into drains embedded in concrete and soil. 4. Flow around cut-off walls. 5. Foundation settlement (consolidation). Most of these problems involve a knowledge of the permeability of the materials involved.
Theory and Problems of Water Percolation. Engineering Monographs No. 8
C. N. Zangar (author)
1953
87 pages
Report
No indication
English
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