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原文传递 DURABILITY OF GEOTEXTILES USED IN REINFORCEMENT OF WALLS AND ROAD SUBGRADE.

题名：	DURABILITY OF GEOTEXTILES USED IN REINFORCEMENT OF WALLS AND ROAD SUBGRADE.
作者：	Powell-B; Mohney-J
关键词：	GEOTEXTILES-; DURABILITY-; WALLS-; REINFORCEMENT-; SUBGRADES-; POLYPROPYLENE-; POLYESTERS-; LONG-TERM; DESIGN-STANDARDS; TEST-SECTIONS; HAUL-ROADS; NONWOVEN-FABRIC; STRENGTH-OF-MATERIALS; FIELD-PERFORMANCE
摘要：	The USDA Forest Service began using geotextiles in the early 1970s, actively contributing to the early stages of technology development. As part of that development, two test projects were completed in the Olympic National Forest in the state of Washington. One project evaluated geotextiles used as reinforcement layers in a "fabric wall" and the other evaluated road subgrade reinforcement. The test wall was constructed in 1975 using two different nonwoven materials, one polypropylene and the other polyester. To help evaluate the long-term durability, samples were retrieved in 1993 and tested to determine changes in strength. Also the original wall design was compared to current design standards. The test road sections were constructed in 1976 using nonwoven fabric and were used for heavy timber hauling during 1977. In 1978 samples of the fabric were extracted from the road and retested. Samples were extracted in 1993 to conduct tests for determining the existing fabric strength, which should provide an indication of the long-term durability of the materials. Testing was completed under the FHWA Pooled Fund Study for durability of geosynthetics for highway applications. Test results indicate a strength loss ranging from 20 to 50%. Most of the strength loss appeared to be a result of the angular fill material piercing the geotextiles. The FHWA design procedure for walls is more conservative than the procedure used for the test wall, primarily due to the creep reduction and lateral resistance factors of safety.
总页数：	Transportation Research Record. 1994. (1439) pp20-24 (2 Phot., 2 Fig., 4 Tab., 3 Ref.)
报告类型：	科技报告