Abstract
In this study, a series of large-scale slope failure experiments with torrential rainfall was carried out and simulated using Discontinuous Deformation Analysis (DDA). Since DDA have not been coupled with flow calculation at present, the rainwater infiltration and rising groundwater level inside the slope was simulated separately using saturated-unsaturated flow analysis by Finite Element Method (FEM). The flow simulation results by FEM were incorporated in the DDA mechanical simulation as reduction of the shear strength and increase of the self weight. In the 2-D DDA model, octagonal blocks of 11.8 cm on average were used and rainfall boundary condition (steady rainfall of 100 mm/hour) was applied to the ground surface. The DDA simulation results were compared with the ones obtained from the rainfall experiments and the applicability of DDA to the slope failure/ collapse caused by torrential rainfall was also discussed. The simulation results also show that groundwater plays important roles for the failure process of soil mass, especially rainwater infiltration mechanism was significantly affected by unsaturated soil properties.
| Original language | English |
|---|---|
| Title of host publication | Proceedings of the 10th International Conference on Advances in Discontinuous Numerical Methods and Applications in Geomechanics and Geoengineering, ICADD 10 |
| Pages | 119-126 |
| Number of pages | 8 |
| Publication status | Published - Feb 24 2012 |
| Externally published | Yes |
| Event | 10th International Conference on Advances in Discontinuous Numerical Methods and Applications in Geomechanics and Geoengineering, ICADD 10 - Honolulu, HI, United States Duration: Dec 6 2011 → Dec 8 2011 |
Publication series
| Name | Proceedings of the 10th International Conference on Advances in Discontinuous Numerical Methods and Applications in Geomechanics and Geoengineering, ICADD 10 |
|---|
Conference
| Conference | 10th International Conference on Advances in Discontinuous Numerical Methods and Applications in Geomechanics and Geoengineering, ICADD 10 |
|---|---|
| Country | United States |
| City | Honolulu, HI |
| Period | 12/6/11 → 12/8/11 |
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ASJC Scopus subject areas
- Geotechnical Engineering and Engineering Geology
- Numerical Analysis
Cite this
DDA simulations for slope failure/collapse experiment caused by torrential rainfall. / Koyama, T.; Irie, K.; Nagano, K.; Nishiyama, Satoshi; Sakai, N.; Ohnishi, Y.
Proceedings of the 10th International Conference on Advances in Discontinuous Numerical Methods and Applications in Geomechanics and Geoengineering, ICADD 10. 2012. p. 119-126 (Proceedings of the 10th International Conference on Advances in Discontinuous Numerical Methods and Applications in Geomechanics and Geoengineering, ICADD 10).Research output: Chapter in Book/Report/Conference proceeding › Conference contribution
}
TY - GEN
T1 - DDA simulations for slope failure/collapse experiment caused by torrential rainfall
AU - Koyama, T.
AU - Irie, K.
AU - Nagano, K.
AU - Nishiyama, Satoshi
AU - Sakai, N.
AU - Ohnishi, Y.
PY - 2012/2/24
Y1 - 2012/2/24
N2 - In this study, a series of large-scale slope failure experiments with torrential rainfall was carried out and simulated using Discontinuous Deformation Analysis (DDA). Since DDA have not been coupled with flow calculation at present, the rainwater infiltration and rising groundwater level inside the slope was simulated separately using saturated-unsaturated flow analysis by Finite Element Method (FEM). The flow simulation results by FEM were incorporated in the DDA mechanical simulation as reduction of the shear strength and increase of the self weight. In the 2-D DDA model, octagonal blocks of 11.8 cm on average were used and rainfall boundary condition (steady rainfall of 100 mm/hour) was applied to the ground surface. The DDA simulation results were compared with the ones obtained from the rainfall experiments and the applicability of DDA to the slope failure/ collapse caused by torrential rainfall was also discussed. The simulation results also show that groundwater plays important roles for the failure process of soil mass, especially rainwater infiltration mechanism was significantly affected by unsaturated soil properties.
AB - In this study, a series of large-scale slope failure experiments with torrential rainfall was carried out and simulated using Discontinuous Deformation Analysis (DDA). Since DDA have not been coupled with flow calculation at present, the rainwater infiltration and rising groundwater level inside the slope was simulated separately using saturated-unsaturated flow analysis by Finite Element Method (FEM). The flow simulation results by FEM were incorporated in the DDA mechanical simulation as reduction of the shear strength and increase of the self weight. In the 2-D DDA model, octagonal blocks of 11.8 cm on average were used and rainfall boundary condition (steady rainfall of 100 mm/hour) was applied to the ground surface. The DDA simulation results were compared with the ones obtained from the rainfall experiments and the applicability of DDA to the slope failure/ collapse caused by torrential rainfall was also discussed. The simulation results also show that groundwater plays important roles for the failure process of soil mass, especially rainwater infiltration mechanism was significantly affected by unsaturated soil properties.
UR - http://www.scopus.com/inward/record.url?scp=84857219837&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=84857219837&partnerID=8YFLogxK
M3 - Conference contribution
AN - SCOPUS:84857219837
SN - 9780415684040
T3 - Proceedings of the 10th International Conference on Advances in Discontinuous Numerical Methods and Applications in Geomechanics and Geoengineering, ICADD 10
SP - 119
EP - 126
BT - Proceedings of the 10th International Conference on Advances in Discontinuous Numerical Methods and Applications in Geomechanics and Geoengineering, ICADD 10
ER -