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| Infiltration rate and hydraulic conductivity of sand-silt soils in the Piedmont physiographic region | |
| Pettyjohn;William Randall | |
| 出版年 | 2014 |
| 学位授予单位 | Georgia Institute of Technology |
| 英文摘要 | In this study, a two phase investigation of the hydraulic conductivity parameters of silty soils was performed. In the first phase, double-ring infiltrometer tests were used to measure infiltration rates in-situ at two sites in the Piedmont physiographic province of Georgia. The efficacy of predicting saturated hydraulic conductivity for Piedmont soils via published soil surveys from the National Resource Conservation Service and pedotransfer functions was then investigated. Work focused on the development of a consistent test methodology for soils (sandy, to silts and clays) in the Piedmont, and the final test method utilized being the constant head test, using a double-ring infiltrometer with Mariotte tubes to maintain the head. In the second phase of the investigation, laboratory based measurements of the saturated hydraulic conductivity of binary mixtures of fine sand and nonplastic silt were performed to investigate the effects of particle mixtures on hydraulic conductivity. The materials used were ASTM 100/200 sand and Sil-Co-Sil 40 non-plastic silt, chosen based on the ratio of the mean particle diameters. Significant effort was invested in the development and comparison of methodologies to produce uniform specimens of the binary mixtures for hydraulic conductivity testing, with the final being modified dry tubing. Two fixed densities were used to investigate the effects of particle packing on the hydraulic conductivity of binary mixtures, with critical fines contents chosen to ensure the finer particles primarily filled the pore volume of the coarse particles. Incremental fines contents, by mass, up to this theoretical fines content were tested. The measured saturated hydraulic conductivity was evaluated in terms of fines content, global and intergranular void ratio, and confining stress. Models for predicting extreme void ratios and saturated hydraulic conductivity of binary mixtures were also investigated. |
| 英文关键词 | Storm water Infiltration Double-ring infiltrometer Hydraulic conductivity Intergranular void ratio Binary mixture |
| 语种 | 英语 |
| URL | http://hdl.handle.net/1853/53023 |
| 来源机构 | Georgia Institute of Technology |
| 资源类型 | 学位论文 |
| 条目标识符 | http://119.78.100.177/qdio/handle/2XILL650/248615 |
| 推荐引用方式 GB/T 7714 | Pettyjohn;William Randall. Infiltration rate and hydraulic conductivity of sand-silt soils in the Piedmont physiographic region[D]. Georgia Institute of Technology,2014. |
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