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MATHEMATICAL ANALYSES OF LANDSIDE SEEPAGE BERMS
| 题名： | MATHEMATICAL ANALYSES OF LANDSIDE SEEPAGE BERMS |
| 作者： | Reginald A. Barron |
| 关键词： | Levee underseepage Mathematical analysis Permeability Seepage berms Seepage control |
| 摘要： | This report describes a study that extends solutions for mathematical analyses of seepage berms presented in "Investigation of Underseepage and Its Control, Lower Mississippi River Levees," Technical Memorandum 3-424, Vol 1, October 1956, US Army Engineer Waterways Experiment Station. A plot of the required seepage berm width. B , versus the ratio of the permeability of the berm to the top blanket.K, for various safety factors indicates B is very sensitive to K for K 1. When the uplift safety factor varies from 1.5 at the landside levee toe to 1.0 at thelandside seepage berm toe, the berm width is only slightly greater than that for a uniform safety factor of 1.0. If the uplift safety factor is greater than 1.0 at the berm toe, then m the top blanket becomes thinner, the berm width becomes longer. Thus, other methods of underseepage control should be investigated to determine whether they may be more economical. When the seepage berm is impervious, the berm width is a maximum. When the seepage berm is infinitely pervious, the berm width is a minimum. Therefore, seepage berms should be constructed of the most pervious soils available (with adequate provisions for control of surface erosion and internal piping) in the interest of economy. Because of the great difficulty in determining the permeability of the foundation, top blanket, and seepage berm, the mathematical solutions presented in this report should be used only as a guide to good engineering Judgement. A range of permeability values should be used rather than average values. Supplements 1, 2, and 3 have been added to this corrected version to present solutions for seepage berms with constant slope of upper surface,riverside seepage berms, and general cases and short berms, respectively. |
| 报告类型： | 科技报告 |
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