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Performance of Impermeable Membranes to Treat Swelling Soils: The Wyoming Experience; Final rept. 1993.4-1994.8
| 题名： | Performance of Impermeable Membranes to Treat Swelling Soils: The Wyoming Experience; Final rept. 1993.4-1994.8 |
| 作者： | Falk, M. A.; Hager, G. M. |
| 关键词： | Geotechnical fabrics; Pavement bases; Moisture content; Highway construction; Wyoming; Membranes; Road materials; Permeability; Deterioration; Geotechnical engineering; Soil mechanics; Subgrades; Pavement condition |
| 摘要： | The Wyoming Department of Transportation has used impermeable membrane below the surfacing section of highways to help prevent the swelling of expansive, clay containing, subgrade soils since 1981. The main purpose of the membrane is to prevent surface moisture from infiltrating the subgrade through cracks in the pavement causing the subgrade to swell at the cracks. The result from this is a very poor ride quality. The purpose of this research project was to determine if the impermeable membrane is working as it was designed. This project involved exhuming 2ft x 2ft (0.6 m x 0.6 m) pieces of impermeable membrane at 12 different sites which were then tested for strength and permeability. These results were then compared to the strength and permeability values of the membrane before installation. The purpose of this comparison was to determine if the membrane had lost some of its impermeable properties due to construction damage or natural deterioration. In addition, several soil samples were taken at each site below the membrane for determination of moisture content, soil classification, and shear strength. |
| 总页数： | 32p |
| 报告类型： | 科技报告 |
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