Journal
GEOTEXTILES AND GEOMEMBRANES
Volume 49, Issue 1, Pages 122-129Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.geotexmem.2020.07.008
Keywords
Geogrid reinforcement; Field monitoring; Embankment; Earth pressure; Deformation
Funding
- National Natural Science Foundation of China [41772284]
- Key Research and Development Project of Chinese Ministry of Science and Technology [2016YFE0105800]
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This study monitored a 33-m-high single-tiered wrapped-facing geogrid reinforced soil embankment in China during construction and for two years afterwards. The results showed an increase in geogrid tensile strains during construction, higher predicted reinforcement loads compared to measured values, linear growth and fast stabilization of vertical earth pressures, horizontal displacement increasing with height, and settlement mainly occurring in the lower and middle portions of the embankment.
Geosynthetic reinforced soil embankment are extensively applied in the construction of high-speed railway and highway in mountainous regions but limited field monitoring is conducted on high and steep cases. Aiming to acquire better understanding, a 33-m-high single-tiered wrapped-facing geogrid reinforced soil embankment with the slope of 1 V:0.5H in China was monitored for 2 years during and after construction. Vertical earth pressure, strain of geogrids, horizontal displacement and settlement per layer were recorded and analysed. The results show that the geogrid tensile strains gradually increased during construction. And they were still developing after completion due to creep and subsequent vehicle surcharge load. The predictions of reinforcement loads by the FHWA methods were much higher than the estimated ones from measured strains. The vertical earth pressures linearly grew during construction and then stabilized fast. The horizontal displacement increases with height and the largest value achieved around the top of the slope two years after the construction is 0.14% the total height approximately. The settlement per layer is larger in the lower and middle portion of the embankment and no obvious change is observed over time. This study hopes to serve as a case reference for design and construction of similar reinforcement projects in the future.
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