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Environmental Earth Sciences

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01.12.2021 | Original Article

Experimental investigation on the influences of rainfall patterns on instability of sandy slopes

verfasst von: Xianghua Song, Yong Tan

Erschienen in: Environmental Earth Sciences | Ausgabe 24/2021

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Abstract

Rainfall-induced slope failures have an inherent relationship with rainfall patterns; however, it has not received adequate attention to date. To investigate the distinctive effects of various rainfall patterns on slope failures, a series of experimental tests, considering five representative rainfall patterns (the uniform, the advanced, the intermediate, the delayed, and the bimodal modes), were carried out on homogenous sandy slope models, respectively. Based on the DIC (Digital Image Correlation Technology) contour maps and physical failure behaviors, three types of failure modes were recognized, i.e., the thrust load caused failure, the surface slide failure, and the retrogressive failure. Different failure mechanisms were investigated in-depth with the help of CFD-DEM numerical simulations. Given the same rainfall amount and duration, the delayed rainfall pattern was identified as the most dangerous one to slope stability, which usually resulted in high-value pore water pressure (PWP) and hence triggered the largest failure depth (D) and distance of crest (L) at the peak rainfall intensity; the advanced rainfall pattern with fastest increase in PWP had the shortest rainfall duration threshold for incurring slope instability. It is disclosed that the rainfall amount thresholds to trigger slope failures were insensitive to different rainfall patterns.

Vorheriger Artikel Spatial analysis of meteorological and hydrological drought characteristics using Copula model

Nächster Artikel Landslide susceptibility mapping using artificial neural network tuned by metaheuristic algorithms

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Titel: Experimental investigation on the influences of rainfall patterns on instability of sandy slopes
verfasst von: Xianghua Song
Yong Tan
Publikationsdatum: 01.12.2021
Verlag: Springer Berlin Heidelberg
Erschienen in: Environmental Earth Sciences / Ausgabe 24/2021
Print ISSN: 1866-6280
Elektronische ISSN: 1866-6299
DOI: https://doi.org/10.1007/s12665-021-10118-6

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