Geomechanics and Engineering

  • 제1권3호
  • /
  • Pages.193-204
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  • 2009
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  • 2005-307X(pISSN)
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  • 2092-6219(eISSN)
테크노프레스 (Techno-Press)
권호 표지
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Rainfall induced instability of mechanically stabilized earth embankments

  • 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)
  • 투고 : 2009.01.05
  • 심사 : 2009.07.08
  • 발행 : 2009.09.25
⟨ 이전 논문 다음 논문 ⟩

초록

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.

키워드

참고문헌

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피인용 문헌

  1. Real-time unsaturated slope reliability assessment considering variations in monitored matric suction vol.7, pp.4, 2009, https://doi.org/10.12989/sss.2011.7.4.263
  2. Design of geocell reinforcement for supporting embankments on soft ground vol.3, pp.2, 2011, https://doi.org/10.12989/gae.2011.3.2.117
  3. Numerical modeling on the stability of slope with foundation during rainfall vol.17, pp.1, 2009, https://doi.org/10.12989/gae.2019.17.1.109
  4. Effect of Wetting Process with Presence of Matric Suction on Unsaturated Gypseous Sand Soils vol.54, pp.5, 2009, https://doi.org/10.35741/issn.0258-2724.54.5.3