Kollam (Kerala), Dec 11 (PTI) NHAI has said that the collapse of the Reinforced Soil wall at Mylakkadu, part of the NH-66 development work here, was due to poor bearing capacity and quality of the soil used, and action has been initiated against the contractor and the engineering firm.

In a statement, the National Highways Authority of India (NHAI) said its preliminary assessment indicates the cause to be a deep-seated shear or bearing capacity failure, meaning the soil at the foundation was too weak to support the fill.

The collapse occurred on December 5 at a 9.4-metre-high reinforced soil wall that serves as an approach to a vehicular underpass at Mylakkadu on the Kollam-Kadambattukonam route while it was under construction.

"Concessionaire and its promoters (M/s Shivalaya) and the I

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