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CHARACTERISTICS AND PERFORMANCE OF PREFABRICATED VERTICAL DRAINS FOR ENHANCED SOIL FLUSHING.
| 题名： | CHARACTERISTICS AND PERFORMANCE OF PREFABRICATED VERTICAL DRAINS FOR ENHANCED SOIL FLUSHING. |
| 作者： | Quaranta-JD; Gabr-MA; Szabo-D; Bowders-JJ |
| 关键词： | PREFABRICATED-; VERTICAL-DRAINS; SOIL-FLUSHING; SANDS-; KAOLINITE-; VACUUM-CONDITIONS |
| 摘要： | The use of prefabricated vertical drains (PVDs) under vacuum conditions for soil flushing was investigated with soils consisting of 100% sand or a combination of 80% sand and 20% kaolinite. Tests of the 100% sand specimens indicated that the areal extent of the PVD zone of influence remained approximately 16 to 21 times the PVD-equivalent diameter (PVD circumference/pi) as the extraction vacuum increased from 2.5 to 20 kPa. Tests of the sand kaolinite specimens (80/20 soil) indicated that the areal extent of the PVD zone of influence remained approximately 5 to 8 times the PVD equivalent diameter as the extraction vacuum increased from 2.5 to 20 kPa. The effective zone of influence in the 80/20 soil did not show a corresponding increase in areal extent as the vacuum pressure was increased beyond the PVD embedment depth. Pilot-scale tracer flushing tests demonstrated the feasibility of using PVDs for flushing 100% sand soil. The tracer testing demonstrated that longer flushing times were necessary to achieve 80% cleanup levels as the dry unit weights of soil increased from 1.57 to 1.67 g/cc. The ratio of final to initial concentration reached 0.2 after flushing of the 1.57 g/cc soil for approximately 40 minutes. A similar ratio was reached after flushing of the 1.67 g/cc soil for 50 minutes. |
| 总页数： | Transportation Research Record. 1997. (1596) pp93-100 (7 Fig., 2 Tab., 2 Ref.) |
| 报告类型： | 科技报告 |
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