Site GDF

Deep Excavation Shoring and Dewatering System

Project Name

Site GDF

Project Location

Gombe, Kinshasa

Project Status

Ongoing

Project Type

Deep Shoring System

Project Overview

The Site GDF project involves the design and execution of a complete shoring and dewatering system to support a deep excavation reaching a depth of 8 meters. The retaining structure is constructed using 750 mm spaced bored piles, installed at calculated intervals to ensure stability during all excavation stages. To counteract lateral pressures from surrounding soil and groundwater, the system incorporates one row of prestressed ground anchors, providing controlled and secure support.

The geological profile consists of soft yellowish sandy clay overlying a cemented sand layer, presenting challenges that required precise drilling, anchoring, and monitoring. Due to the high groundwater table, a deep well dewatering system was deployed to lower water levels below the final excavation depth, ensuring dry, safe, and stable working conditions throughout construction activities.

Key Project Highlights

  • Excavation Depth:
    8-meter deep controlled excavation.

  • Shoring System:
    750 mm diameter spaced bored piles designed for excavation support.

  • Ground Anchors:
    One row of prestressed ground anchors for lateral stability.

  • Soil Conditions:
    Combination of soft sandy clay and cemented sand layers.

  • Groundwater Management:
    Deep well dewatering implemented due to high water table.

  • Stability & Safety:
    System engineered to ensure safe site conditions during all phases.

Project Challenges Engineering Solutions
High Groundwater Table Deep Well Dewatering System
Soft Sandy Clay Layer Tailored Drilling & Support Techniques
Cemented Sand Layer Tailored Drilling & Support Techniques
Deep Excavation Requirement (8 m) 750 mm Spaced Bored Piles + Prestressed Anchors

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