Variability effect of strength and geometric parameters on the stability factor of failure surfaces of rock slope by num
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ORIGINAL PAPER
Variability effect of strength and geometric parameters on the stability factor of failure surfaces of rock slope by numerical analysis Zulkifl Ahmed 1 & Shuhong Wang 1 & Omar Hamdi Jasim 2 & Yuan Xu 1 & Pengyu Wang 1 Received: 16 May 2020 / Accepted: 2 October 2020 # Saudi Society for Geosciences 2020
Abstract In loose or highly weathered rock slopes, the circular shear failure mechanism occurs in large scale. Most rock slope stability investigations ignore the influence of geometric parameters, i.e., failure surface entry point distance (le). This study presents failure surface determination based on constant element stress-based method. The failure surfaces and their sliding mechanism are analyzed first by using FLAC3D (Fast Lagrangian Analysis of Continua in three-dimension). A real case of instability corresponds to a loose rock is presented and its stability is determined by numerical analysis. To investigate the effectiveness of present method the influence of shear strength (c, φ) and geometric parameters (α, β) on the safety factor (FS) is also analyzed by using Geo5, FLAC3D and ABAQUS computer codes. Then, Geo5 and Statistical Package for the Social Sciences (SPSS) softwares were used to determine the effect of dimensionless parameter lambda (λ) on the failure surface entry point distance (le) and length of failure arc (L). The results show that shear failure may occur in non-homogeneous slope. Shear failure has exit and entry points situated either on the surface or near the toe of slope. The length of failure arc (L) is affected by the le and λ. Moreover, it can be acknowledged that the relation of both L and le with shear strength parameters (c, φ) is logarithmic, respectively. So, based on the rock strength parameters, L and le are predictable by using the equations derived from nonlinear regression. Keywords Slope stability . Length of failure arc (L) . Failure surface . Entry point distance (le) . Dimensionless function (λ) . Constant element stress-based method
Introduction Variability is a natural property of rocks due to complex environmental and geological effects. In the stability analysis of slopes, it is more representative to consider the variability effect of rock strength parameters on failure surface (Huang et al. 2017; Tan et al. 2017; Xiao et al. 2017; Qi and Li 2018; Responsible Editor: Zeynal Abiddin Erguler * Zulkifl Ahmed [email protected] * Shuhong Wang [email protected] 1
School of Resource and Civil Engineering, Northeastern University, Shenyang 110819, China
2
Department of Civil Engineering, Yildiz Technical University, Istanbul, Turkey
Xiao et al. 2018). Extensive research has been carried out previously to explore the influence of variability of rock properties on the risk of slopes by different methods. A nonintrusive stochastic finite element method is proposed for slope stability assessment considering shear strength parameters (Jiang et al. 2014). The numerical methods have been used to study the reliability of two-dimensional slopes con
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