A field capable team with a can-do attitude

Biliran Geothermal Power Plant

Client
Biliran Geothermal Inc - Orka Energy
Location
Philippines
Categories
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.

Barrow Island Gas Installation

Client
Fugro Alluvial Offshore td
Location
New Zealand
Categories
Asset Protection, Infrastructure & Development

Working in partnership with the client offering downhole geophysical logging for measurement of geotechnical engineering properties.

  • Downhole geophysical logging including P- & S-wave suspension logging, ATV, and numerouse wireline tools for geotechnical charaterisation

Co-O and Tambis Mines, Philippines

Client
Philsaga Mining
Location
New Zealand
Categories
Mining

Feasibility study for 1200m deep, 6.5m diameter shaft in rock.

Review and recommendations for newly excavated 350m deep, 4m square shaft.

Pre-feasibility assessment of pit slope angles in altered rock.  200m deep excavation. (Ongoing).

Key components including:

  • Geotechnical review of mine exploration logs
  • Geotechnical mapping rock exposures / shaft
  • Rockmass condition assessment for pit slopes and underground

Numerical and analytical assessment of stability and ground support

Coal Loadout Facility, Mozambique

Client
Geopractica SA
Location
New Zealand
Categories
Infrastructure & Development, Mining

Cross-hole geophysical investigations to assess ground conditions in very deep (100m) soft sediments.  Technical challenges included installation of sealed casing in bentonite filled drillholes to the full depth of the sediment pile.

Completed April 2007

CPT Testing (to prove ground improvement)

Client
N/A
Location
New Zealand
Categories

North Island

Completing CPT testing both prior and post ground improvement using stone columns at various sites. The Ground improvement guidelines require CPT testing to be completed  to help understand the improved affects of various ground improvement options.

Didipio Au-Cu Project, Philippines

Client
OceanaGold Philippines Inc.
Location
New Zealand
Categories
Infrastructure & Development, Mining

Geotechnical advice form mine operations including waste dumps (soil and rock) and open pit. (Ongoing).

Didipio Downhole Geophysical Logging

Client
OceanaGold Philippines
Location
Philippines
Categories
Mining

RDCL conducted Acoustic Televiewing (ATV) in two 500m deep holes advanced from the developing underground mine. ATV was chosen by the client to identify and understand the orientation of structures that may affect development of the mine.
The scope of the work included:

  • Acoustic televiewer (ATV) data acquisition
  • Data processing and Quality assurance
  • Interpretation of geophysical logs including assessment of geotechnical structures.
  • Interaction with site geotechnical staff

Downhole Geophysicial Logging NZ Roading Projects

Client
NZTA
Location
New Zealand
Categories
Asset Protection, Infrastructure & Development

NZTA and its partners have developed large scale roading projects across the North Island of New Zealand since 2012. RDCL’s geophysics team have supported the downhole testing investigations with both Optical Televiewer (OTV),  Acoustic Televiewer (ATV), and other geophysical downhole tools: 

The scope of work included;

  • Management, planning and logistics that form part of working on large projects with various parties (consultants, drillers, land owners) and some helicopter access;
  • Mobilisation and demobilisation of tools / personnel to remote / hard to access sites;
  • Establishment of equipment at boreholes on multiple sites;
  • Logging multiple boreholes;  
  • Processing of data, provision of factual data reports.
  • Seismic CPT (SCPT) testing;
  • Seismic downhole borehole testing; 
  • Surface based seismic testing completed with MASW:
  • SCPT and seismic downhole testing;
  • Processed seismic data with picked P-wave and S-wave arrival times and associated interval velocities;  MASW,
  • Processing shear wave velocities over depth.

Echo Coal Mine

Client
Francis Mining
Location
New Zealand
Categories
Asset Protection, Mining

Geotechnical services for provision of open cut and waste dumps.  High seismic, high rainfall area.  Stability assessment and support during construction (Ongoing).

  • Geotechnical investigation program management
  • Geotechnical drilling logging
  • Fractured rockmass for open pit wall stability
  • Waste materials and groundwater levels for stability assessment
    • Geotechnical assessment slope stability in fractured rockmass
    • Geotechnical assessment waste dump stability

 

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