Pile Testing

Southern Geophysical has over 10 years experience in carrying out pile testing. Pile testing is used to assess new and existing building piles, bridge abutments, foundations and other structures. There are a number of pile testing methods that can be used, depending on the requirements of the project. Methods include: Low Strain Integrity, Cross-hole Sonic Logging (CSL), Single-hole Sonic Logging (SSL), Parallel Seismic and GPR. We have the equipment and expertise to determine which method would be most suited to your project and can provide the testing that your project requires. All testing meets the relevant ASTM standards. We can undertake testing at any location within New Zealand and the Pacific Islands

Non-destructive Concrete Scanning - Ground Penetrating Radar (GPR)

At Southern Geophysical Ltd we utilise a range of GPR systems and we are experts with using high frequency GPR. The use of high frequency GPR systems to assess concrete is ideally suited to locate voids, assess structural elements of concrete slabs, and map rebar spacings. GPR can be used for floors, concrete walls, retaining walls and other structures. In addition to GPR data collection, we can also provide you with a range of different reporting outcomes, including 3-D models of floor slabs.

Cross-hole Shear Wave Velocity Measurements

Southern Geophysical Ltd is able to provide the testing needed to meet MBIE requirements. The New Zealand Ministry of Business and Innovation (MBIE) Canterbury Technical Guidance Foundations, Part C (April 2015, 3a) now requires that "In soils with a higher IC value/fines content, the target CPT resistances must be achieved, or specific engineering analyses performed to demonstrate that the liquefaction potential is adequately mitigated. Alternatively, cross-hole shear wave velocity (CSV) testing can be used to assess the composite stiffness of the improvement zone. The target improvement is considered to have been met if a composite cross-hole VS profile within the improvement zone is achieved to the MBIE published criteria."
Southern Geophysical Ltd is able to provide the CSV testing needed to determine if the target composite shear wave velocities are being met for your building site.

Shear Wave Testing

The shear wave velocity (Vs) of the subsurface is an engineering parameter used for calculating liquefaction potential, site amplification and other engineering or pre-build requirements. Southern Geophysical Ltd can determine Vs parameters and can also provide Vs30, which feeds directly into site classifications. We can measure Vs directly using downhole shear-wave tests, or indirectly using Multi-channel Analysis of Surface Waves (MASW). The MASW provides a 2D profile of the Vs along a survey line, which can be useful for identifying changes in stratigraphy and lithology across a site.

Bedrock Profiling

Profiling the depth to rock across site, either in 2D or 3D space, is a common engineering requirement. Depending on the depth of the rock at the site, Southern Geophysical Ltd has the expertise to carry out a geophysical survey using one or more of the following methods: GPR, MASW, Seismic refraction, tomography, and Seismic reflection. Call us today and we can help you determine the best method for your project requirements.

Vibration Monitoring

Southern Geophysical Ltd undertakes a range of vibration monitoring projects for:

  • Demolition activity
  • Construction activity
  • Heavy transportation
  • Pile driving
  • Dynamic compaction
  • Tunnel and subway construction
  • Bridge construction/response
  • Environmental