Probabilistic Assessment of Soil–Rock Mixture Slope Failure Considering Two-Phase Rotated Anisotropy Random Fields

IF 3.6 2区工程技术 Q2 ENGINEERING, GEOLOGICAL International Journal for Numerical and Analytical Methods in Geomechanics Pub Date : 2024-12-16 DOI:10.1002/nag.3921

Chuanxiang Qu, Yutong Liu, Haowen Guo, Hongjie Fang, Kaihao Cheng, Haoran Yuan, Yong Chen

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Abstract

Soil–rock mixture (SRM) slopes consist of soils and rocks and are widely distributed globally. In addition to heterogeneity and discontinuity within SRM slopes, the inherent spatial variability can be observed in soil and rock properties. However, spatial variability in rock and soil properties and layouts has not been well considered in the stability analysis of SRM slopes. Additionally, SRM slopes commonly show a rotated anisotropic fabric pattern, while such fabric has rarely been accounted for in SRM slope stability analysis. In this study, a two-phase rotated anisotropy random field simulation method is proposed to model these spatial variations simultaneously. The proposed approach is then integrated with the finite element method (FEM) to study the impacts of soil volume fraction and bedding dip angle (i.e., rotated anisotropy) on the probability of failure (p_f) and failure mode of SRM slopes. It is found that considering only spatially varying layouts can underestimate p_f by up to 97% compared to considering both spatially variable properties and layouts. The increase in soil volume fraction significantly improves p_f and the likelihood of deep failure. The bedding dip angle greatly influences p_f, yet deep failure remains dominant across different bedding dip angles. Furthermore, the failure mode of SRM slopes is more sensitive to the changes in soil volume fraction than to bedding dip angle.

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考虑两相旋转各向异性随机场的土岩混合物边坡崩塌概率评估

土石混合物（SRM）边坡由土壤和岩石组成，在全球范围内广泛分布。除了 SRM 斜坡内部的异质性和不连续性之外，土壤和岩石特性也存在固有的空间变异性。然而，在对 SRM 斜坡进行稳定性分析时，尚未充分考虑岩土性质和布局的空间变异性。此外，SRM 斜坡通常表现为旋转各向异性结构模式，而在 SRM 斜坡稳定性分析中却很少考虑这种结构。本研究提出了一种两相旋转各向异性随机场模拟方法，以同时模拟这些空间变化。然后将所提出的方法与有限元法（FEM）相结合，研究土壤体积分数和垫层倾角（即旋转各向异性）对 SRM 斜坡破坏概率（pf）和破坏模式的影响。研究发现，与同时考虑空间可变特性和布局相比，仅考虑空间可变布局会低估 pf 高达 97%。土壤体积分数的增加会大大提高 pf 值和深层破坏的可能性。垫层倾角对 pf 有很大影响，但在不同的垫层倾角下，深层破坏仍占主导地位。此外，与垫层倾角相比，SRM 斜坡的破坏模式对土壤体积分数的变化更为敏感。

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来源期刊

International Journal for Numerical and Analytical Methods in Geomechanics 工程技术-材料科学：综合

CiteScore

6.40

自引率

12.50%

发文量

160

审稿时长

9 months

期刊介绍： The journal welcomes manuscripts that substantially contribute to the understanding of the complex mechanical behaviour of geomaterials (soils, rocks, concrete, ice, snow, and powders), through innovative experimental techniques, and/or through the development of novel numerical or hybrid experimental/numerical modelling concepts in geomechanics. Topics of interest include instabilities and localization, interface and surface phenomena, fracture and failure, multi-physics and other time-dependent phenomena, micromechanics and multi-scale methods, and inverse analysis and stochastic methods. Papers related to energy and environmental issues are particularly welcome. The illustration of the proposed methods and techniques to engineering problems is encouraged. However, manuscripts dealing with applications of existing methods, or proposing incremental improvements to existing methods – in particular marginal extensions of existing analytical solutions or numerical methods – will not be considered for review.