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GEOTEXTILES AND LOESS: LONG-TERM FLOW.
| 题名： | GEOTEXTILES AND LOESS: LONG-TERM FLOW. |
| 作者： | Denkler-P; Bowders-J; Loehr-E |
| 关键词： | Erosion-control; Filtration-; Flow-; Flow-capacity; Flow-rate; Geotextiles-; Loess-; Silt-fence; Soil-geotextile-compatibility; Tests- |
| 摘要： | The ability of a geotextile to separate soils having varying grain size distributions while still allowing for flow makes them ideally suited for erosion control and filtration applications. A well-engineered and constructed silt fence will satisfy three design criteria: adequate permeability, soil retention, and soil compatibility. This project is focused on soil-geotextile compatibility. Several test methods exist to evaluate soil-geotextile compatibility. The Long-Term Flow (LTF) test, in which soil is placed above the candidate geotextile and a constant head of water is applied above the soil was used in this study. Water flows through the soil/geotextile for a long period to determine the compatibility condition of steady flow or non-steady flow rates of excessive clogging or soil piping. Nine geotextiles supplied for the silt fence market are being tested. Mid-Missouri loess is the candidate soil. Test results to date indicate soil-geotextile compatibility, i.e., the geotextiles do not clog excessively nor do the loess particles pass through the geotextiles. However, the flow rates are low initially and subsequently decrease, becoming steady after 2,000 hours of flow. While not clogging the geotextile per se, the subsequent decrease in flow rate may contribute to the geotextiles having an insufficient flow capacity to be effective silt fences or filters in loess. |
| 总页数： | Conference Title: Mid-Continent Transportation Symposium 2000. Location: Ames, Iowa. Sponsored by: Iowa State University |
| 报告类型： | 科技报告 |
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