Three-Dimensional Spectral Element Method Implementation for Evaluating Rooted Soil Behavior in Slope Stability Analysis

Author:

Tiwari Ram Chandra1,Bhandary Netra Prakash2ORCID

Affiliation:

1. Department of Civil Engineering, Institute of Engineering, Pulchowk Campus, Tribhuvan University, Kathmandu 44601, Nepal

2. Department of Environmental Design, Faculty of CRI, Graduate School of Science and Engineering, Ehime University, Matsuyama 790-8577, Japan

Abstract

Bioengineering techniques are being increasingly adopted as a sustainable solution to soil slope instability. Despite their recognized benefits, however, the mechanistic contribution of vegetation to slope stability remains inadequately understood due to the intricate nature of soil–root interactions and the complexity of root architectures. Most existing research predominantly offers qualitative assessments of vegetation effectiveness. This study aims to numerically substantiate the role of vegetation as a bioengineering technique for soil slope stabilization. Various plant species used commonly for soil stabilization were identified, and undisturbed soil samples were collected to quantify the shear strength parameters of the soils from both barren and vegetated slopes, along with root tensile strengths. A comprehensive topographic survey was conducted to capture the precise topography of the study area. Utilizing these primary data, in this work we develop 3D models for five representative plants within each species category and employ the Spectral Element Method (SEM), an advanced higher-order formulation of the finite element method (FEM), within the 3D domain to evaluate the factor of safety for the soil slopes. The SEM offers superior accuracy and stability in numerical computations. The results obtained through the SEM were corroborated through the FEM modeling and were found to be consistent with other established methodologies. This innovative approach of 3D SEM aims to quantitatively assess the impact of vegetation on soil slope stability and provide a more rigorous understanding of bioengineering applications in geotechnical engineering.

Publisher

MDPI AG

Reference29 articles.

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3. Morgan, R.P.C., and Rickson, R.J. (1995). Slope Stabilization and Erosion Control—A Bioengineering Approach, E & FN SPON.

4. Shear strength of a soil containing vegetation roots;Ali;Soils Found.,2008

5. Root strength and root area of forest species in Lombardy;Bischetti;Plant Soil,2005

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