 Heavy rainfall caused saturation and increase in pore pressure of the slope debris material.  Also, slope was vulnerable because of toe cutting at steeper angle during road widening operation and eventually failure took place. In rock, failure occurred
An Interim Report on Preliminary  Geological  Slope Stability Assessment of the Recent Disaster Affected Areas in Parts of Chamoli District, Uttarakhand by Bhupendra Singh, Bhupender Singh, Ajay Kumar and Arindam Roy, Senior Geologists, M-IV, NR GSI Dehr
UK_CHA_NH_ 041
Along road, left bank of Pinder river, north of Bargaon village on SH-11
Removal of overhangs, slope modification with benches, concrete breast wall with weep holes, concrete retaining wall.
Prolonged precipitation caused saturation of slope debris leading to reduction of shear strength, road cutting at steeper angle.