Power Grid Corporation of India Ltd, Tejpur, Assam

Key Achievements

  • Keller’s innovative solution, involving use of large diameter columns helped in optimizing the construction time.
  • Optimized solution addressed settlement and stability requirements
  • Efficient methodology helped in delivering project that would perform consistently in environmental sensitive, seismic zone V location,

The Project

M/s Powergrid Corporation of India Ltd ( PGCIL ) proposed India’s 1st Ultra High Voltage Direct Current ( UHVDC ) energy highway project to transmit the generated energy from Arunachal Pradesh in North East India and Bhutan to Agra ( Central India ), a distance of 1,728 KM’s. M/s ABB Power Technologies in association with M/s Bharat Heavy Electrical Ltd was appointed by PGCIL to build the project. The project comprised of a converter station in Assam, spread over 10,00,000 m2 and various electrical equipment structures as service building, valve control hall, P1, P2, AC transformers, tower foundations and other heavy structures.

The Challenge

The geotechnical investigation of the proposed site suggested that the subsoil comprised of poorly graded loose to medium fine sand followed by medium to stiff and then dense silt layer that posed a challenge to the bearing capacity and settlement due to which site was prone to liquefaction too. Executing the project of this magnitude in seismic zone V was an additional challenge.

The Solution

Keller’s solution involved ground improvement works using wet vibro stone columns of diameter ranging from 800mm to 1100mm and 11.5m in length. Large diameter stone columns provided added advantage as considerable amount of construction duration is optimized. Adequacy of the job was verified by performing column load test and real time monitoring of installation woks by automated devices.

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Project Facts

  • Owner

    Power Grid Corporation of India Ltd, Tejpur, Assam

  • Main Contractor(s)

    ABB Power Technologies

  • Keller Business Unit(s)

    Keller Ground Engineering India Pvt Ltd

  • Engineer