Biliran Geothermal Power Plant
- Biliran Geothermal Inc - Orka Energy
- Infrastructure & Development
Understanding the changes in the bedrock was a key requirement for this project, completing surface based geophysics helped understand this, and direct the following intrusive investigations.
The propose of the investigation was to help the client and contractor understand the depth of piles, and geotechnical issues at the site to aid with the tender process in a timely manner. RDCL’s geophysical capabilities and speed of establishment were a winning combination to get an early understanding of varying ground conditions.
The geotechnical investigation was situated in a remote mountainous area, and was for proposed 50MW geothermal power plant. RDCL mobilised resources within 3 days of contract confirmation with our geophysics team to complete surface based survey.
Site investigations included;
- Surface based geophysical survey comprising;
- Seismic refraction tomography (SRT) to measure compressional wave velocity;
- MASW to measure shear wave velocity;
- Vertical electrical sounding to measure apparent resistivity; Laboratory testing from test pits and boreholes.
- Site walkover and geological mapping to confirm investigation locations and identify geo-hazards;
- Supervision of 7 triple tubed boreholes; engineering geological logging of recovered materials on 24hr shifts;
- Test pits investigations across site to understand near surface materials and suitability for shallow foundations, identify FILL material if required;
Analysis and reporting included;
- Factual reports as the site investigation progressed, and final factual report 2 weeks after completion, and
- Geotechnical report confirming foundation options for the various plant, and recommendations to help mitigate geotechnical risks associated with the overall development.