Shear strength characterization and back analysis for a landslide complex

S. Somasundaram, T. Shenthan, T. D. Stark, T. D. Wright

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

Abstract

Future phases of landfill expansion at a municipal solid waste landfill in Southern California required the characterization and mitigation of a 16-hectare complex of coalescing pre-existing landslides in sedimentary bedrock. Traditional back-analysis of the entire slide mass yielded unreasonably low values of slide plane shear strength. A hybrid approach, which combined laboratory testing for site-specific validation and application of empirical correlations, with back analysis of a retrogressive failure geologic model, resulted in a realistic evaluation of slide plane shear strength. A limit equilibrium model developed to simulate the progressive nature of the failure, correctly predicted the geometry of each stage of the failure accompanied by a corresponding factor of safety at or less than unity, thereby validating both the progressive nature of the failure and the shear strength parameters. Numerical analysis using FLAC was an additional verification of the progressive failure.

Original languageEnglish (US)
Title of host publicationGeoCongress 2012
Subtitle of host publicationState of the Art and Practice in Geotechnical Engineering
Pages673-682
Number of pages10
Edition225 GSP
DOIs
StatePublished - Dec 1 2012
EventGeoCongress 2012: State of the Art and Practice in Geotechnical Engineering - Oakland, CA, United States
Duration: Mar 25 2012Mar 29 2012

Publication series

NameGeotechnical Special Publication
Number225 GSP
ISSN (Print)0895-0563

Other

OtherGeoCongress 2012: State of the Art and Practice in Geotechnical Engineering
Country/TerritoryUnited States
CityOakland, CA
Period3/25/123/29/12

ASJC Scopus subject areas

  • Civil and Structural Engineering
  • Architecture
  • Building and Construction
  • Geotechnical Engineering and Engineering Geology

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