利用3DEC模型探索隐蔽陡斜阶地滑坡的机理:中国陕西省山阳滑坡案例研究

IF 4.6 3区 地球科学 Q1 GEOSCIENCES, MULTIDISCIPLINARY
China Geology Pub Date : 2024-04-25 DOI:10.31035/cg2024044
Jia-yun Wang , Zi-long Wu , Xiao-ya Shi , Long-wei Yang , Rui-ping Liu , Na Lu
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引用次数: 0

摘要

灾难性地质灾害经常发生在具有斜倾基底结构的斜坡上(也称为斜倾基底斜坡),在这种斜坡上,不易看到明显的倾斜滑动。这种现象已成为滑坡研究的焦点。然而,关于隐蔽、陡峭的斜向倾覆斜坡的破坏模式和机理的研究却十分缺乏。本研究调查了中国陕西省的山阳滑坡。通过实地调查、实验室岩土参数测试和 3DEC 软件,本研究建立了滑坡的数值模型,以分析此类斜坡的破坏过程。研究结果表明,山阳滑坡主要是在重力作用下沿着薄弱夹层滑动。在稳定的倾斜岩体的支撑下,滑坡最初沿倾角方向滑动,但在软弱夹层的成岩作用下,滑坡方向发生了改变,向明显的倾角方向移动。在这一过程中,岩溶溶解带的滑动阻力效应越来越大,横向摩擦力是主要的阻力。岩溶溶解导致侧向摩擦力减小,使山阳滑坡的表观倾角滑动特征更加明显。值得注意的是,坡脚处的弯曲和隆起等变形表明,主要的滑动阻力从岩溶溶蚀区内的侧向摩擦力转移到坡脚的阻力上,导致滑坡最终屈曲破坏。本研究揭示了山阳滑坡明显的倾角蠕动-屈曲的新型破坏模式,突出了岩溶溶蚀带的侧向摩擦力在其破坏机制中的关键作用。这些见解为减轻斜倾覆滑坡的风险和预防相关灾害提供了宝贵的参考。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Exploring mechanism of hidden, steep obliquely inclined bedding landslides using a 3DEC model: A case study of the Shanyang landslide in Shaanxi Province, China

Catastrophic geological disasters frequently occur on slopes with obliquely inclined bedding structures (also referred to as obliquely inclined bedding slopes), where the apparent dip sliding is not readily visible. This phenomenon has become a focal point in landslide research. Yet, there is a lack of studies on the failure modes and mechanisms of hidden, steep obliquely inclined bedding slopes. This study investigated the Shanyang landslide in Shaanxi Province, China. Using field investigations, laboratory tests of geotechnical parameters, and the 3DEC software, this study developed a numerical model of the landslide to analyze the failure process of such slopes. The findings indicate that the Shanyang landslide primarily crept along a weak interlayer under the action of gravity. The landslide, initially following a dip angle with the support of a stable inclined rock mass, shifted direction under the influence of argillization in the weak interlayer, moving towards the apparent dip angle. The slide resistance effect of the karstic dissolution zone was increasingly significant during this process, with lateral friction being the primary resistance force. A reduction in the lateral friction due to karstic dissolution made the apparent dip sliding characteristics of the Shanyang landslide more pronounced. Notably, deformations such as bending and uplift at the slope's foot suggest that the main slide resistance shifts from lateral friction within the karstic dissolution zone to the slope foot's resistance force, leading to the eventual buckling failure of the landslide. This study unveils a novel failure mode of apparent dip creep-buckling in the Shanyang landslide, highlighting the critical role of lateral friction from the karstic dissolution zone in its failure mechanism. These insights offer a valuable reference for mitigating risks and preventing disasters related to obliquely inclined bedding landslides.

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来源期刊
China Geology
China Geology GEOLOGY-
CiteScore
7.80
自引率
11.10%
发文量
275
审稿时长
16 weeks
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