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논문 기본 정보

자료유형
학술저널
저자정보
Roy, Debasis (Department of Civil Engineering, IIT Kharagpur) Chiranjeevi, K. (Department of Civil Engineering, IIT Kharagpur) Singh, Raghvendra (Department of Civil Engineering, IIT Kharagpur) Baidya, Dilip K. (Department of Civil Engineering, IIT Kharagpur)
저널정보
테크노프레스 Geomechanics & engineering Geomechanics & engineering 제1권 제3호
발행연도
2009.1
수록면
193 - 204 (12page)

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A 10.4-m high highway embankment retained behind mechanically stabilized earth (MSE) walls is under construction in the northeastern part of the Indian state of Bihar. The structure is constructed with compacted, micaceous, grey, silty sand, reinforced with polyester (PET) geogrids, and faced with reinforced cement concrete fascia panels. The connections between the fascia panels and the geogrids failed on several occasions during the monsoon seasons of 2007 and 2008 following episodes of heavy rainfall, when the embankment was still under construction. However, during these incidents the MSE embankment itself remained by and large stable and the collateral damages were minimal. The observational data during these incidents presented an opportunity to develop and calibrate a simple procedure for estimating rainfall induced pore water pressure development within MSE embankments constructed with backfill materials that do not allow unimpeded seepage. A simple analytical finite element model was developed for the purpose. The modeling results were found to agree with the observational and meteorological records from the site. These results also indicated that the threshold rainwater infiltration flux needed for the development of pore water pressure within an MSE embankment is a monotonically increasing function of the hydraulic conductivity of backfill. Specifically for the MSE embankment upon which this study is based, the analytical results indicated that the instabilities could have been avoided by having in place a chimney drain immediately behind the fascia panels.

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