On 15th August 2018, during heavy rainfall, a debris slide and a cut slope failure happened at Kuthiran transportation tunnel.  The debris slide happened above the portal of tunnel 1 and cut slope failure happened above right spring of tunnel 2.  Heavy r
Kuthiran tunnel slides
Kuthiran village
The loose material near crown and accumulated material near the tunnel  portal needs to be removed,  the overburden existing above the portal of the tunnel needs to be stabilised by proper benching, cable anchors anchored to the bed rock may be provided.
Heavy rainfall and infiltration of water into the overburden material above portal of the transportation tunnel increased the pore water pressure and decreased the shear strength of the overburden material resulted in sliding of overburden material along