Services Used
Comprehensive geotechnical investigation for the planned extension of Tbilisi Metro Line 3, spanning 8.5 kilometers through diverse geological conditions including alluvial deposits and volcanic formations. The project required detailed subsurface characterization to support tunnel design and station construction in challenging urban environments.
Challenge
The primary challenge involved characterizing highly variable ground conditions ranging from soft alluvial soils near the Mtkvari River to weathered volcanic rocks in hillside sections. Additionally, the investigation needed to account for existing underground utilities and historical structures in the densely built urban corridor.
Solution
We deployed a comprehensive investigation program including 45 deep boreholes (up to 60m depth), extensive CPT testing, and cross-hole seismic surveys. Advanced 3D geological modeling integrated all data to create detailed ground models for each tunnel section and station location.
Results
- Complete subsurface characterization along 8.5km corridor
- Identification of 3 major fault zones requiring special tunnel design
- Groundwater management recommendations reducing dewatering costs by 30%
- Foundation design parameters for 6 new metro stations