Proceedings of the Rocscience International Conference (RIC 2023)

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Anisotropic Strength Model for Stability Analysis on Metasedimentary Sandstone-Shale Rock Slope: A Case Study

Authors
Mohd Mustaqim Mohd-Nordin1, 2, Mohd Ashraf Mohamad Ismail1, *, Mazlina Razali1, 3
1School of Civil Engineering, Universiti Sains Malaysia, Engineering Campus, Nibong Tebal, Penang, Malaysia
2Civil Engineering Studies, College of Engineering, Universiti Teknologi MARA (Pahang), Bandar Tun Abdul Razak, Jengka, Malaysia
3Civil Engineering Studies, College of Engineering, Universiti Teknologi MARA (Penang), Permatang Pauh, Penang, Malaysia
*Corresponding author. Email: ceashraf@usm.my
Corresponding Author
Mohd Ashraf Mohamad Ismail
Available Online 8 November 2023.
DOI
10.2991/978-94-6463-258-3_71How to use a DOI?
Keywords
Anisotropic Strength Model; Stability Analysis; Interbedded Rock Slope
Abstract

The anisotropic geological setting has a predominant multi-orientation of weakness planes that are integrated with the matrix structure of major joint sets. The sedimentary bedding orientation and shear surface resistance significantly governed the plane’s deformation characteristics and, thus, the mode of failure. In this study, the metasedimentary sandstone-shale interbedded rock slope at Gubir, Kedah, the north of Malaysia Peninsula, was examined. The rock slope formation is calculated for the factor of safety (FoS) using the 2D limit equilibrium method (LEM) by employing an anisotropic geomaterial with a directional strength model. The 2D rock slope geometrical profile was extracted from the Structure from Motion (SfM) point cloud photogrammetry images. The geological description and local geostructural characteristics for the study area were recognised based on the bedding characterization and rock material identification. The interpretation with the probabilistic factor of failure to increase confidence in the input parameter values that were assigned and consider the uncertainty for these values. Accordingly, the Mohr-Coulomb strength parameters of bedding material were identified as the main contribution to controlling the failure potential. The sensitivity analysis has proven the critical level of these variable parameters for the failure of the slope, or else for the safer slope. This stability analysis result was validated by the shear strength reduction result in the Finite Element Method (FEM) simulation. The range area of the shear band representing the maximum shear strain shows similar failure behaviour with the minimum FoS determined by GLE/Morgenstern-Price, thus validating the results obtained.

Copyright
© 2023 The Author(s)
Open Access
Open Access This chapter is licensed under the terms of the Creative Commons Attribution-NonCommercial 4.0 International License (http://creativecommons.org/licenses/by-nc/4.0/), which permits any noncommercial use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license and indicate if changes were made.

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Volume Title
Proceedings of the Rocscience International Conference (RIC 2023)
Series
Atlantis Highlights in Engineering
Publication Date
8 November 2023
ISBN
10.2991/978-94-6463-258-3_71
ISSN
2589-4943
DOI
10.2991/978-94-6463-258-3_71How to use a DOI?
Copyright
© 2023 The Author(s)
Open Access
Open Access This chapter is licensed under the terms of the Creative Commons Attribution-NonCommercial 4.0 International License (http://creativecommons.org/licenses/by-nc/4.0/), which permits any noncommercial use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license and indicate if changes were made.

Cite this article

risenwbib
TY  - CONF
AU  - Mohd Mustaqim Mohd-Nordin
AU  - Mohd Ashraf Mohamad Ismail
AU  - Mazlina Razali
PY  - 2023
DA  - 2023/11/08
TI  - Anisotropic Strength Model for Stability Analysis on Metasedimentary Sandstone-Shale Rock Slope: A Case Study
BT  - Proceedings of the Rocscience International Conference  (RIC 2023)
PB  - Atlantis Press
SP  - 770
EP  - 782
SN  - 2589-4943
UR  - https://doi.org/10.2991/978-94-6463-258-3_71
DO  - 10.2991/978-94-6463-258-3_71
ID  - Mohd-Nordin2023
ER  -