Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Geosynthetically reinforced, wrapped-faced mechanically stabilized earth (MSE) retaining walls are one of the first applications of reinforced soil technology, dating back to the early 1970's. The use of a geosynthetic as the exposed wrap component is, however, commonly viewed as a temporary application due to concern regarding the geosynthetic's performance when exposed to natural weathering such as ultra-violet (UV) light, temperature and moisture from rainfall and humidity. As the use of geosynthetic products in MSE wall applications continues to grow, an increased awareness exists pertaining to the long-term performance of the geosynthetic products when utilized under exposed conditions (i.e., when not embedded in soil). Although data from previously conducted accelerated weathering tests provided an indication as to the relative performance of these products when exposed to natural weathering, the data from these tests were insufficient to quantify actual long-term performance. Further, actual outdoor weathering data that have been collected at sites where geosynthetics have been exposed to weathering reflect only site specific weathering and minimal time periods. Finally, although typical standard specifications stipulate at least 70% retention in tensile strength after 500 hours exposure to a Xenon Arc energy source used to accelerated weathering, the pertinence of the specification to long-term performance is questionable. This paper reports on a testing program whose data may fill the existing data void. The paper describes a study on polypropylene (PP) biaxial Geogrid and presents the test method and procedures implemented in using the QUV weathering device. The long-term performance prediction protocols necessary to correlate the accelerated weathering data to field performance of exposed geosynthetics are discussed in the paper. It should be noted that the study featured herein utilizes data collected only for PP geogrids exposed to natural weathering.
Geosynthetically reinforced, wrapped-faced mechanically stabilized earth (MSE) retaining walls are one of the first applications of reinforced soil technology, dating back to the early 1970's. The use of a geosynthetic as the exposed wrap component is, however, commonly viewed as a temporary application due to concern regarding the geosynthetic's performance when exposed to natural weathering such as ultra-violet (UV) light, temperature and moisture from rainfall and humidity. As the use of geosynthetic products in MSE wall applications continues to grow, an increased awareness exists pertaining to the long-term performance of the geosynthetic products when utilized under exposed conditions (i.e., when not embedded in soil). Although data from previously conducted accelerated weathering tests provided an indication as to the relative performance of these products when exposed to natural weathering, the data from these tests were insufficient to quantify actual long-term performance. Further, actual outdoor weathering data that have been collected at sites where geosynthetics have been exposed to weathering reflect only site specific weathering and minimal time periods. Finally, although typical standard specifications stipulate at least 70% retention in tensile strength after 500 hours exposure to a Xenon Arc energy source used to accelerated weathering, the pertinence of the specification to long-term performance is questionable. This paper reports on a testing program whose data may fill the existing data void. The paper describes a study on polypropylene (PP) biaxial Geogrid and presents the test method and procedures implemented in using the QUV weathering device. The long-term performance prediction protocols necessary to correlate the accelerated weathering data to field performance of exposed geosynthetics are discussed in the paper. It should be noted that the study featured herein utilizes data collected only for PP geogrids exposed to natural weathering.
Predicting the Long-Term Performance of Exposed Geosynthetic Wrapped-Faced MSE Retaining Walls
2015
11 Seiten, Bilder, Tabellen, Quellen
Aufsatz (Konferenz)
Datenträger
Englisch
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Permanent Geosynthetic Wrapped Face MSE Retaining Wall
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Long-Term Reinforcement Load of Geosynthetic-Reinforced Soil Retaining Walls
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Failure mechanisms of steep-faced geosynthetic-reinforced retaining walls subjected to toe scouring
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Failure mechanisms of steep-faced geosynthetic-reinforced retaining walls subjected to toe scouring
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