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<p>The accelerated growth and urban expansion in Brazil without proper planning have resulted in informal settlements in areas susceptible to landslides, intensifying landslide risks due to anthropogenic interventions and the increased frequency of extreme weather events. This study investigates the stability of urban slopes in Nova Descoberta, Recife, Brazil, incorporating extreme rainfall events and anthropogenic actions. Using the limit equilibrium method and the finite element method, the research evaluates the stability of the Córrego do Joaquim slope, considering rainwater infiltration, pipeline leaks, and the presence of a water supply tank. Field and laboratory tests, along with recent surface data obtained via drone photogrammetry, enabled the development of a geological-geotechnical planialtimetric model of the study area for numerical modeling. The results show a general agreement between the methods but highlight discrepancies in the factor of safety in specific scenarios, underlining the need for multiple methods. Rainwater infiltration significantly impacted stability, while plastic tarps did not ensure safety according to Brazilian standards. Pipeline leaks presented stability risks even with waterproofing against rain. In this analysis, the shear strength reduction method demonstrated advantages over the limit equilibrium method in detecting rupture progression.</p>

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Stability Analysis of an Urban Slope Under Human Activities and Critical Rainfall: Case Study of Recife, Brazil

  • 期刊论文

  • 发表日期：

    2025年1月3日

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  • Pedro Gomes dos Santos Pereira,
  • Roberto Quental Coutinho,
  • Danisete Pereira de Souza Neto,
  • Igor Fernandes Gomes

摘要

The accelerated growth and urban expansion in Brazil without proper planning have resulted in informal settlements in areas susceptible to landslides, intensifying landslide risks due to anthropogenic interventions and the increased frequency of extreme weather events. This study investigates the stability of urban slopes in Nova Descoberta, Recife, Brazil, incorporating extreme rainfall events and anthropogenic actions. Using the limit equilibrium method and the finite element method, the research evaluates the stability of the Córrego do Joaquim slope, considering rainwater infiltration, pipeline leaks, and the presence of a water supply tank. Field and laboratory tests, along with recent surface data obtained via drone photogrammetry, enabled the development of a geological-geotechnical planialtimetric model of the study area for numerical modeling. The results show a general agreement between the methods but highlight discrepancies in the factor of safety in specific scenarios, underlining the need for multiple methods. Rainwater infiltration significantly impacted stability, while plastic tarps did not ensure safety according to Brazilian standards. Pipeline leaks presented stability risks even with waterproofing against rain. In this analysis, the shear strength reduction method demonstrated advantages over the limit equilibrium method in detecting rupture progression.