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r^reiaDTicatBu wan L/ram oyaiiBrn lor wudurTC
| 题名： | r^reiaDTicatBu wan L/ram oyaiiBrn lor wudurTC |
| 作者： | Y. Grace Hsuan and Robert M. Koermer |
| 关键词： | drainage behind retaining structures, material specification and design guidelines, prefabricated geocomposite drains (PGDs). |
| 摘要： | The conventional method to reduce hydrostatic pressure behind vertical structures, such abutments and retaining walls, is to use coarse aggregate to capture and transmit incoming liquid. This method may be expensive depending upon the availability of the coarse aggregate. In addition, it may be difficult or unreliable to install a vertical soil drainage layer behind a structure. An altemative approach is to use prefabricated geocomposite drains (PGDs) to replace the coarse aggregate. The objectives of this work order are to evaluate material properties and design criteria, as well as to provide a cost comparison of a PGD system behind retaining structures. The final outcomes of this work order are material specification and design guidelines, which can assist the usage of PGDs in highway construction. The work order consists of four tasks; 1. Review of current available literature on PGD; 2. Assessment of the current available PGDs and cost comparison; 3. Assessment of the current usage of the PGDs; and 4. Development of specification and guidelines. |
| 报告类型： | 科技报告 |
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