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Author: search.filters.author.Banyong, Rungkhun

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    Rectangular tunnel heading stability in three dimensions and its predictive machine learning models
    (2024-11-01)
    Shiau, Jim
    ;
    Keawsawasvong, Suraparb
    ;
    Lai, Van Qui
    ;
    Promwichai, Thanachon
    ;
    Kamchoom, Viroon
    Tunnel heading stability in two dimensions (2D) has been extensively investigated by numerous scholars in the past decade. One significant limitation of 2D analysis is the absence of actual tunnel geometry modeling with a considerable degree of idealization. Nevertheless, it is possible to study the stability of tunnels in three dimensions (3D) with a rectangular shape using finite element limit analysis (FELA) and a nonlinear programming technique. This paper employs 3D FELA to generate rigorous solutions for stability numbers, failure mechanisms, and safety factors for rectangular-shaped tunnels. To further explore the usefulness of the produced results, multivariate adaptive regression spline (MARS) is used for machine learning of big dataset and development of design equations for practical design applications. The study should be of great benefit to tunnel design practices using the developed equations provided in the paper.
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    Trapdoor Stability of Drained Cohesive-Frictional Soils Using Terzaghi’s Superposition Method
    (2023-04-01)
    Shiau, Jim
    ;
    Banyong, Rungkhun
    ;
    Keawsawasvong, Suraparb
    ;
    Kamchoom, Viroon
    Most previous trapdoor stability studies were centered on undrained clay in two dimensions in the past few decades. Very few works were reported for cohesive-frictional soils in two- and three-dimensions. This paper sets out to examine the stability of trapdoors in c-ϕ soils under both 2D planar and 3D circular (axisymmetric) conditions using a superposition method that is similar to Terzaghi’s bearing capacity coefficients approach. Using lower bound and upper bound limit analysis with finite elements, the proposed three coefficients (Fc, Fs, and Fγ) are determined with respect to a series of parametric changes of depth ratios and soil internal friction angles. Novel design charts and tables are presented, and several examples are provided to show how to use the three coefficients to evaluate soil stability under planar and circular trapdoors. The numerical results presented in the paper should be of interest to the geotechnical engineering community.