Factors Controlling Rainfall-Induced Slope Instability of Natural Slopes in North Maleny, Queensland

Abstract

Rainfall infiltration is a significant triggering factor of slope failures as major landslide events have occurred during or immediately after rainfall. The rainfall-induced slope instability is governed by a complex interaction of topographical, hydrological and geological conditions of the slopes; hence these properties are critical parameters in determining slope stability under rainfall. The slopes in reservoirs catchments areas are constantly subjected to heavy rainfall with high intensity; thus, investigating the effect of rainfall on slope failures is vital to mitigate the adverse consequences. In this study, two critical slopes were identified based on high rates of erosion, sediment run-off, and elevated risk in Eden Road and Newsham in Lake Baroon Catchment, North Maleny, Queensland, Australia. The effect of slope geometry was analyzed by parametric analysis with the parameters; of soil's initial moisture content, rainfall intensity, and intermittent rainfall on landslide initiation in these two critical slopes by employing seepage and slope stability. The stability of the slopes was evaluated by the factor of safety, based on the produced seepage conditions from seepage analyses. The outcomes of the parametric studies are involved in identifying critical slope regions and rainfall conditions to mitigate the potential risk of rainfall-induced slope failures on Baroon Pocket Dam, Queensland.

Integrated Geophysical Analysis for Landslide Risk Mitigation: A Case Study on the Weak Zone Area of Jantho-Lamno Route, Aceh, Indonesia

“…3 Seismic Refraction Results at L1 Mitigation strategies for this steep site included retaining walls, gabions, drainage systems, and vegetation cover to prevent slope collapse and regulate water movement. Vegetation's root systems enhanced shear strength and stability, particularly in weak or unstable areas [21,22,23].…”

Vertical Capillary Barriers and Wick Drains to Mitigate the Rain-induced Slope Failures: Numerical Analysis

“…However, most critical triggering factors of slope failures such as various dimensions (slope geometries), hydrological properties of the layers of vertical capillary barrier system and the hydrological properties of the slope materials should be studied with respect to different rainfall intensities and intermittent rainfall, to optimize the effectiveness of the introduced methods in this study [20]. The optimum horizontal spacing of the capillary barrier systems within the slope should be investigated considering the shape of wetting front between two capillary barriers by a 3D numerical model analysis and those results should be validated by a physical model.…”

Experimental study on the failure of loose accumulation landslides under rainfall conditions

“…Rainfall-induced landslides are a type of recurrent geological hazard, resulting in substantial economic losses and potential casualties (Vasu et al, 2016;Wang et al, 2019a;Xing et al, 2021). Investigating the deformation and failure patterns of loose accumulation landslides under rainfall conditions holds significant engineering significance for landslide prediction and forecasting (Chen et al, 2019;Abeykoon and Jayakody, 2022).…”