Abstract:
The hilly regions of Kerala are severely affected by excess rainfall, causing tremendous damage due to landslides and slope failures. From 2018 onwards, several kinds of soil soils are failed in Kerala, leading to immense damage to different civil infrastructures, including soil piping and ground damage. Hence, it is necessary to strengthen the existing slope profiles to prevent such disasters and avoid their risk to human lives and civil infrastructures.
This paper studies the effect of the micropile to reinforce the soil slopes in the Idukki district of Kerala, where soil slope failures are frequent. Micropile as slope reinforcement is an efficient solution for strengthening the slopes since they can be easily installed without disturbing the equilibrium of the hill slope. In this study, three-dimensional slope stability analysis is carried out on soil slopes from the Idukki district to obtain the deformations and factors of safety values. Herein, the soil slope is fully saturated with a maximum pore pressure ratio of 0.98 or piezometric surface at the ground level to simulate high rainfall intensity in the model. The investigation using the MIDAS GTS NX program is performed based on the strength reduction method. The critical soil slopes are then modelled with micro piles to analyze their effectiveness in improving the strength and stability under static and dynamic conditions. Different micropile arrangements are considered, and a series of slope stability analyses are carried out to obtain the optimum configuration with the required safety factor. A parametric study is also carried out on a selected slope to investigate the effect of spacing, angle of inclination and depth of embedment of micro piles in improving the slope stability.
Keywords: Stability, micro pile, GTS NX, rainfall intensity, pore pressure ratio
Abstract: Theme 4