Study on shear behavior of interbedded sandstone and mudstone slope using ring shear test

Cheng Me Liao*, Hung Ming Lin, Der Her Lee, Po Ying Chen, Jyh-Jong Liao

*Corresponding author for this work

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

1 Scopus citations

Abstract

As slopes in the interbedded sandstone and mudstone formation are geologically characterized by proneness to landslides, past elaborations on the failure mechanism of such slopes were mostly confined to the fact that slope slides often occur after rainfalls when rainwater permeates through sandstone formation. Due to sharp difference in water permeability between sandstone and mudstone, the groundwater will accumulate on the interface of the interbedded formation, resulting in increased pore water pressures and reduced safety coefficients. In the process of slides with large displacement, however, change of mechanical properties on the sliding surface is a major factor that affects slope slides. For this purpose, the study aims to develop a ring shear test apparatus that can be applicable to weak rock materials to obtain their residual strength values under the condition of large displacement. The results show that ring shear tests are more effective in obtaining the actual residual strength of weak rock materials and complete post peak shear behaviors than direct shear tests. The results of this study also demonstrate that abrasion between grains of rock materials still continues till their residual strength values reach a stable condition, even though these rock materials are affected by the action of shear strength, and that the content of fine grained materials increases with the normal force in the shear zone.

Original languageEnglish
Title of host publicationProceedings of The Seventeenth 2007 International Offshore and Polar Engineering Conference, ISOPE 2007
Pages1601-1606
Number of pages6
StatePublished - 3 Dec 2007
Event17th 2007 International Offshore and Polar Engineering Conference, ISOPE 2007 - Lisbon, Portugal
Duration: 1 Jul 20076 Jul 2007

Publication series

NameProceedings of the International Offshore and Polar Engineering Conference
ISSN (Print)1098-6189
ISSN (Electronic)1555-1792

Conference

Conference17th 2007 International Offshore and Polar Engineering Conference, ISOPE 2007
CountryPortugal
CityLisbon
Period1/07/076/07/07

Keywords

  • Interbedded formation
  • Residual strength
  • Ring shear test
  • Slope failure
  • Weak rocks

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