Due to excessive slope cutting and dipping of sandstone beds towards the slope which failed during incessant rainfall
Yadav, S., Mohanty, A., Kandpal, J., 2020. Macro-scale (1:50,000) Landslide Susceptibility Mapping in Toposheet No. 83 D/11 and in parts of Toposheet Nos. 83 D/6, 7 & 10 in Hailakandi and Karimganj districts of Assam, Kolasib and Mamit districts of Mizor
NA.
Bilkhawthlir- Kolasib road slide
NH-54
Modification of slope by providing stable slope angle  and construction of protection wall  along with weep hole to release the pore water pressure.
Bedded sandstone with unfavourable bedding plane dipping towards the valley, Extensive cut slopeting and incessant rainfall.