In fluence of a firm stratum on probabilistic slope stability analyses with spatially variable undrained soil strength

IF 5.3 1区工程技术 Q1 COMPUTER SCIENCE, INTERDISCIPLINARY APPLICATIONS

Computers and Geotechnics Pub Date : 2024-09-25 DOI:10.1016/j.compgeo.2024.106782

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Abstract

The influence of a firm stratum on the stability of a slope under undrained conditions has long been of interest to geotechnical investigators, which has been studied in a number of previously important works in relation to slope stability analyses without considering soil spatial variability. This paper proposes another look at such a problem in the context of probabilistic slope stability analyses considering soil spatial variability. Here, the random field (RF) is used to simulate the spatially variable undrained soil strength. It is found that under stationary RF and non-stationary RF with the soil strength at the top ground surface (s_u0) larger than 0, the depth of the firm stratum (H_f) has a significant influence on the mean and standard deviation of factor of safety (i.e., μ[FS] and σ[FS], respectively). By contrast, under non-stationary RF with s_u0 = 0, H_f has a slight influence on μ[FS], but its influence on σ[FS] is non-negligible. In addition, the autocorrelation distance is found to have an insignificant impact on the influential effect of H_f on μ[FS]. However, for σ[FS], this impact is not negligible. When the autocorrelation distance is smaller, the influence of H_f on σ[FS] would be more significant. Under non-stationary RF, the influence of H_f on σ[FS] would be slight if the autocorrelation distance is large enough. Furthermore, the impacts of slope ratio, s_u0, isotropic and anisotropic features on the influential effects of H_f are also investigated and discussed.

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稳固地层对具有空间可变不排水土壤强度的概率斜坡稳定性分析的影响

长期以来，岩土工程研究人员一直关注在不排水条件下坚固地层对边坡稳定性的影响，以前的一些重要著作在不考虑土壤空间变异性的情况下对边坡稳定性分析进行了研究。本文建议在考虑土壤空间变异性的概率边坡稳定性分析中重新审视这一问题。本文使用随机场（RF）来模拟空间可变的排水土壤强度。研究发现，在地表顶部土壤强度（su0）大于 0 的静态 RF 和非静态 RF 条件下，稳固层深度（Hf）对安全系数的平均值和标准偏差（即分别为 μ[FS] 和 σ[FS]）有显著影响。相比之下，在 su0 = 0 的非稳态射频条件下，Hf 对 μ[FS] 的影响很小，但对σ[FS] 的影响不可忽略。此外，还发现自相关距离对 Hf 对 μ[FS]的影响效应影响不大。然而，对于 σ[FS]，这种影响不可忽略。当自相关距离较小时，Hf 对 σ[FS]的影响会更大。在非稳态射频条件下，如果自相关距离足够大，Hf 对 σ[FS]的影响会很小。此外，还研究和讨论了斜率、su0、各向同性和各向异性特征对 Hf 影响的影响。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Computers and Geotechnics 地学-地球科学综合

CiteScore

9.10

自引率

15.10%

发文量

438

审稿时长

45 days

期刊介绍： The use of computers is firmly established in geotechnical engineering and continues to grow rapidly in both engineering practice and academe. The development of advanced numerical techniques and constitutive modeling, in conjunction with rapid developments in computer hardware, enables problems to be tackled that were unthinkable even a few years ago. Computers and Geotechnics provides an up-to-date reference for engineers and researchers engaged in computer aided analysis and research in geotechnical engineering. The journal is intended for an expeditious dissemination of advanced computer applications across a broad range of geotechnical topics. Contributions on advances in numerical algorithms, computer implementation of new constitutive models and probabilistic methods are especially encouraged.