Hydrological effects on Rainfall-Induced Slope instability: A Case Study

Abstract Real-time monitoring of the slope will give the actual slope assessment and according to the data received the slope behavior can be analyzed. Monitoring the soil slope behavior is essential to understand the slope section's failure mechanism. According to NDMA (National Disaster Management Authority) report, 2019–2020, 15% of the landmass in India is prone to landslides. The measurement of pore water pressure and site displacement for different rainfall intensities can be obtained. Measuring the performance of the slope and hydrological conditions will give more understanding of the underlying problem of slope behavior. Proper instrumentation during real-time monitoring of the slope can provide a proper understanding of the failure mechanism of the soil slope and the development of the failure surface due to seepage of rainwater. Reduction of the catastrophic effect can be achieved by having a proper insight into the slope behavior. The positions of tensiometers placed at different levels of the slope shows the significance of pore water pressure developed not only due to presence of groundwater table but that developed during rainfall period. Finite element (FE) analysis can be performed for validation of the results obtained from the field study. The potential slip surface of the slope determined from the analysis shows the location at which the slope failure can potentially occur. The simulation shows that the FE based study present here can be used in other slope study as well. A reliable and sustainable slope stabilization technique has been developed to tackle slope instability due to rainfall in the study area using the field data and the FE analysis. A threshold level can be identified by the system providing advanced warning criteria for the area.