Geotechnical survey for road construction
Drilling along the route, subgrade soil testing and a longitudinal geological profile for highways, streets and paved areas.
Licensed service · EL-845/2026
The durability of a road depends first of all on the soil beneath it. A subgrade built on weak, swelling or saline soil deforms quickly, leading to cracks, rutting and potholes. A geotechnical survey for road construction studies soil variability along the route and provides the data needed to design the subgrade, pavement layers and drainage correctly.
Boreholes are drilled at regular intervals along the centreline and additionally at bridges, overpasses, deep cuts and high embankments. We determine particle size distribution, optimum moisture and maximum dry density (Proctor test), plasticity, salinity and swelling. Where required, the suitability of local construction materials such as sand and gravel is also assessed.
On the lowlands of Azerbaijan saline soils and shallow groundwater, and in the foothills landslides and mudflows, strongly influence road design. These processes are described separately in the report together with recommended engineering measures.
Geological data is prepared in the same coordinate system as the topographic survey (state system or UTM zone 39N) and can be used directly in road design software such as Civil 3D and Credo.
When you need it
- Design of a new road
- Reconstruction and widening of an existing road
- City streets and residential area roads
- Car parks, yards and industrial pavements
- Bridges and culverts on a road
What's included
- Drilling of boreholes along the route
- Additional boreholes at structures
- Soil sampling
- Proctor compaction and particle size analysis
- Salinity and swelling tests
- Groundwater records
- Assessment of hazardous geological processes
How we work
- Review of the route plan and profile
- Positioning of boreholes along the route
- Drilling and sampling
- Laboratory testing
- Longitudinal geological profile and report
Deliverables
- Engineering geological report
- Longitudinal geological profile along the route
- Table of subgrade soil properties
- Recommendations on drainage and soil replacement
