DDA simulations for slope failure/collapse experiment caused by torrential rainfall

T. Koyama, K. Irie, K. Nagano, S. Nishiyama, N. Sakai, Y. Ohnishi

Research output: Chapter in Book/Report/Conference proceedingConference contribution

3 Citations (Scopus)

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 languageEnglish
Title of host publicationProceedings of the 10th International Conference on Advances in Discontinuous Numerical Methods and Applications in Geomechanics and Geoengineering, ICADD 10
PublisherCRC Press
Pages119-126
Number of pages8
ISBN (Print)9780415684040
DOIs
Publication statusPublished - Jan 1 2012
Event10th International Conference on Advances in Discontinuous Numerical Methods and Applications in Geomechanics and Geoengineering, ICADD 10 - Honolulu, HI, United States
Duration: Dec 6 2011Dec 8 2011

Publication series

NameProceedings of the 10th International Conference on Advances in Discontinuous Numerical Methods and Applications in Geomechanics and Geoengineering, ICADD 10

Conference

Conference10th International Conference on Advances in Discontinuous Numerical Methods and Applications in Geomechanics and Geoengineering, ICADD 10
CountryUnited States
CityHonolulu, HI
Period12/6/1112/8/11

ASJC Scopus subject areas

  • Geotechnical Engineering and Engineering Geology
  • Numerical Analysis

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  • Cite this

    Koyama, T., Irie, K., Nagano, K., Nishiyama, S., Sakai, N., & Ohnishi, Y. (2012). DDA simulations for slope failure/collapse experiment caused by torrential rainfall. In Proceedings of the 10th International Conference on Advances in Discontinuous Numerical Methods and Applications in Geomechanics and Geoengineering, ICADD 10 (pp. 119-126). (Proceedings of the 10th International Conference on Advances in Discontinuous Numerical Methods and Applications in Geomechanics and Geoengineering, ICADD 10). CRC Press. https://doi.org/10.1201/b11600-15