Identify the physical characteristics of the subsoil at the proposed wind turbine locations.
Inconclusive survey results, additional surveys required, results causing overly conservative foundation designs.
At Forte we ensure top quality by
1) issuing a detailed specification which outlines clearly the required results and related format
2) monitoring investigations as they progress and
3) lead value engineering meetings at completion to promote optimised designs.
Geotechnical Site Investigations are complex surveys. Defining the extent of required investigations requires understanding of the local terrain, knowledge of different investigation techniques and a keen awareness of the cost benefit analysis of using such techniques.
If handled correctly additional surveys can often be avoided, saving additional survey costs and avoiding delays to the wind farm engineering process.
1) Sign a) multiple work package (“EPC Manager”) contract or b) single-work package contract with Forte.
2) Issue all required information to commence survey
3) Arrange all accesses to survey areas with landowner
*Forte can execute the survey with its partner or manage the Clients appointed surveyor
1. Documentation Check (Desk Study)
Review of project documentation to identify what constraints are to be considered when conducting the survey. Review of national databases to identify the regional soil characteristics, historical activities in the local area and historical flooding patterns
2. Scope Definition and Specification Confirmation
After obtaining access to site (action by client with support from Forte) survey will be conducted in accordance with specification.
4. Site Investigation Reporting
5. Value Engineering and Final Report Issuance
1) Site Investigation Report:
Desk Study and Site Investigation findings report including the following: borehole logs and laboratory analysis results, summary of expected soil properties at each WTG location, expert opinion on conducting excavations and soil improvement measures required
2) Engineering Report:
After receipt of preliminary foundation design from the foundation design team, the soil behaviour of the ground when supporting the proposed foundation will be examined to confirm suitability.
3) Hydrogeological Survey Report (Optional):
Results of desk study into local regional water table behaviour including analysis of local databases and results of onsite investigations to determine maximum expected water tables at each wind foundation location within the wind farm site.
FLAC 3D, FOXTA,TALREN V
Note: It is not possible to mitigate all geotechnical risks prior to the construction phase as even extensive surveys only provide a small representative sample but with best management practices geotechnical risks can be minimised.