The most likely causes of failure based on the present studies are: a. Very steep slope. b. Weak lithology. c. Highly jointed rock (three set plus random set of joints). d. The increase of pore water pressure due to incessant rains prior to the incident
Steep slope, ground vibration caused by passage of heavy vehicle may also have aggrevated failure.
Sonapur 4km mile stone
NH-6
Removal of loose boulders and debris material from upslope. Spot rock bolting staggered and anchored to stitch the large rock block upslope. Perforated drainage pipe (steel) should be inserted at 15 angle to decrease the pore water pressure which will al
a) Valley dipping daylighted joint plane leading to planar failure. b) Steep cut slope. c) Increase in pore water pressure.