Abstract
The main objective of the study is to estimate the shear resistance mobilized on the slope surface under large deformation and to identify the failure mechanism of the landslide through the simulation model. The field investigations were carried out using Geophysical tests, and the laboratory tests were conducted to identify the engineering properties of the soil with weathering characteristics of the parent rock. The residual shear strength parameters from Torsional ring shear tests were used in LS-RAPID numerical simulation software to study the mechanism of the landslide. The critical pore water pressure ratio (ru = 0.32) required for the initiation of a landslide was obtained. The increase in pore water pressure reduces the soil matric suction and thereby results in the reduction of the shear strength of the soil. The progressive failure mechanism and the three landslide processes (initiation, run out and deposition) are investigated. The velocity of the moving landslide mass in the role of demolishing the building is studied and helps in finding suitable remedial measures for the nearby building. The empirical rainfall threshold based on the antecedent rainfall was developed and revealed that either a high daily rainfall intensity of 142 mm without any antecedent rainfall, or an antecedent rainfall of 151 mm for a cumulative period of 5 days with even continuous normal rainfall can initiate landslide.
Highlights
Rainfall-induced landslides are one of the major disasters experienced all around the globe
The main objectives of this study are (1) identifying the subsurface profile of the soil and their influence on the landslides, (2) geotechnical properties of the soil in identifying the classification of landslide, (3) the influence of weathering in the failure of landslide, (4) the shear resistance mobilized on the slip surface under large deformation, (5) the failure mechanism of the landslide through a simulation model, and (6) the region-specific threshold based on the daily rainfall and antecedent rainfall for possible early warning
Since the tests were conducted under drained conditions, no excess pore water pressure development was observed during shearing [46]
Summary
Rainfall-induced landslides are one of the major disasters experienced all around the globe. Many researchers have studied the causative mechanisms of landslides by considering the effects of rainfall [1,2,3,4,5]. Many researchers have discussed rainfallinduced landslides [6,7]. It has been shown that rainfall-induced landslides are caused by the development of excess pore water pressure and seepage force [11,12,13]. The development of pore water pressure reduces matric suction potential and results in decreased effective stress [14,15]. The decline in effective stress induces the landslide.
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