Coupled Flow Deformation Analysis of Rainfall-Induced Cutting Failure of Ratnagiri District, Maharashtra
摘要
Slope instability poses significant challenges in Konkan region of Maharashtra. In monsoon season, the failure of laterite slope cuttings often obstructs the Konkan railways for several days. Recently, many researchers have performed uncoupled flow deformation (UFD) as well as coupled flow deformation analysis (CFD) for understanding the mechanism of rainfall-triggered landslides. This study presents the stability analysis of the failed and modified lateritic soil cutting subjected to rainfall infiltration using CFD analysis in GeoStudio 2D software [1]. The cutting is situated at MIDC-Zarap in Ratnagiri district of Maharashtra. The results of the CFD analysis for both failed and modified geometry obtained from the present study are compared with those of the UFD analysis obtained by Rahul et al. [2]. For the given slope geometry, material properties and rainfall infiltration rate, the factor of safety values for UFD analysis are found to be lower than those obtained from the CFD analysis. Furthermore, the parametric studies are conducted on modified cutting geometry to check the effect of variation in ground water conditions and depth of competent strata below the slope using the UFD analysis due to its slightly conservative performance and time-efficiency.