A shallow landslide induced by soil strength deterioration: Serra da Aliança mountain range (SE Brazil)

IF 1.7 4区地球科学 Q3 GEOSCIENCES, MULTIDISCIPLINARY

Journal of South American Earth Sciences Pub Date : 2025-02-13 DOI:10.1016/j.jsames.2025.105419

Marcos Eduardo Hartwig , Cleber Gonzales de Oliveira , Prêntice Filho , Rogério Pinto Ribeiro , Lázaro Valentin Zuquette

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Abstract

In southeastern Brazil, landslides are often associated with prolonged and/or intense rainfall events. The km 14 sign of the ES-177 road located in the Espírito Santo State (SE Brazil) was blocked by a large translational landslide (∼31,000 m³) that occurred in the driest month of 2018. This study aimed to estimate the magnitude and the spatial distribution of surface displacements and to investigate the underlying reasons that led to slope failure. The study included the compilation of existing data, remote sensing techniques such as visual satellite image interpretation and Digital Image Correlation (DIC), site reconnaissance, geotechnical data, and 2D numerical modeling. The slope encompasses highly weathered banded gneiss covered by residual soil. The landslide appears to have evolved in different stages. Surface displacements reached up to 10 m. The slip surface is made of a thin clay band consisting of expansive clay (montmorillonite). It is believed that time-dependent mechanisms reduced shear strength triggering the landslide.

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由土壤强度劣化引起的浅层滑坡：Serra da alian山脉（巴西东南部）

在巴西东南部，山体滑坡通常与长时间和/或强降雨事件有关。位于Espírito Santo State（巴西东南部）的ES-177公路的14公里标志被2018年最干旱月份发生的大型平移性滑坡（约31,000立方米）阻塞。本研究旨在估计地表位移的大小和空间分布，并探讨导致边坡破坏的潜在原因。这项研究包括现有数据的汇编、遥感技术，例如卫星图像解译和数字图像相关（DIC）、现场勘测、岩土工程数据和二维数值模拟。斜坡环绕着被残余土壤覆盖的高度风化的带状片麻岩。滑坡似乎经历了不同阶段的演变。地表位移达10米。滑面由膨胀粘土（蒙脱土）组成的薄粘土带构成。认为时间相关机制降低了引发滑坡的抗剪强度。

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

Journal of South American Earth Sciences 地学-地球科学综合

CiteScore

3.70

自引率

22.20%

发文量

364

审稿时长

6-12 weeks

期刊介绍： Papers must have a regional appeal and should present work of more than local significance. Research papers dealing with the regional geology of South American cratons and mobile belts, within the following research fields: -Economic geology, metallogenesis and hydrocarbon genesis and reservoirs. -Geophysics, geochemistry, volcanology, igneous and metamorphic petrology. -Tectonics, neo- and seismotectonics and geodynamic modeling. -Geomorphology, geological hazards, environmental geology, climate change in America and Antarctica, and soil research. -Stratigraphy, sedimentology, structure and basin evolution. -Paleontology, paleoecology, paleoclimatology and Quaternary geology. New developments in already established regional projects and new initiatives dealing with the geology of the continent will be summarized and presented on a regular basis. Short notes, discussions, book reviews and conference and workshop reports will also be included when relevant.