Abstract
Landslides are present in all continents playing important role in the continual evolution of this type of or similar geohazard. They constitute a serious hazard in many areas of the world. The landslide event can be single or multiple. This paper involves the geotechnical analysis of landslide that occurred in Amuzukwu Abia State Nigeria. Amuzukwu landslide of about volume 3.5 x 104 m2 which was classified as rotational has a detached surface which is roughly circular and spoon-like. The paper also discussed the manifestation, causes and effect of landslide. For geotechnical analysis, samples were collected from the site of the landslide and subjected to the following soil tests: natural moisture content, specific gravity, relative density, Atterberg limits, sieve analysis, compaction, permeability, shear strength, and unit weight. Slopes adjacent to the slides that are still intact were also analyzed using Plaxis 2D to determine their factors of safety. Both the geotechnical laboratory results and Plaxis 2D results reveal that another landslide is inevitable if the conditions of the infinite slope is not improved using the methods recommended in this paper. Some of the methods recommended include cutting back of slope to reduce its gradient, reinforcement (using Reinforced concrete), soil nailing as well as anchors and retaining structures.
Highlights
Samples were collected from 10 different points around the slope and subjected to the following test: natural moisture content, specific gravity, relative density, Atterberg limits, sieve analysis, compaction, permeability, shear strength, and unit weight
Natural moisture content (%) Specific gravity Relative density (%) Liquid limit (%) Plastic limit (%) Plasticity index (%) % passing through sieve no. 200 Compaction optimum moisture content (OMC) (%) Permeability Cohesion Angle of internal friction (°) Unit weight
The moisture content at which soil changes from semisolid to plastic state is known as plastic limit (PL) whereas the moisture content at which soil changes from plastic to a liquid state is known as liquid limit (LL)
Summary
A landslide can be defined as the movement of rocks, detritus, or soil caused by the action of gravity [1]. It involves rapid displacement of rock mass, residual soils, or sediments adjoining a slope [2,3]. Landslide is occasioned by terrain instability, and for this reason, it is important in geotechnical practice to analyze the stability of slope. Water is one of the most contributing factors to instability It decreases cohesion in soils and increases weight and pore water as well as the gravitational driving forces in slopes [4]. That is why the geotechnical analysis of Amuzukwu landslide is needed since it is a prerequisite to the landslide prediction models and instrumentations
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