Landslides are the land movement which occur in natural hill slope or artificial cut slopes due to increase of shear stresses resulting in fall, flows, toppling, spreading etc. The two main causes for the slides to occur are rainfall, and earthquakes. Heavy seasonal rainfall leads to generation of pore water pressure between the particles thus reducing the strength of the material and increasing the stresses leading to failure. Excavated slopes for road widening in or any other purpose hilly terrains lose their stability due to reduction of strength owing to dynamics loads affecting the stability by generation of stresses along the weaker joints / spacing by losing its property. This may cause damage to infrastructure which leads to loss of life and property.
Mitigation goals are the lessening of slides (controlling the movements) by construction of engineered systems along the slopes. Mitigation measures are not classified according to the phenomenon that caused but by the method of stabilization used.
- Geometric method: Nature of slope
- Horological factors: reduction of water pressures or lowering of water table
- Mechanical methods: Installation of reinforcement systems