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 |








