Earthquake Prone Area Development
Constructing or Rebuilding in Earthquake-Prone Areas
With updated building requirements following the Christchurch Earthquake sequence, geotechnical assessments have become essential for constructing or repairing buildings in earthquake-prone areas.
These assessments ensure your foundation design mitigates risks such as liquefaction, safeguarding the structure and its occupants. Whether it’s for a new build or repairing an existing structure, KGA provides tailored geotechnical reports that meet the specific needs of your project.
Understanding Foundation Technical Categories (TC)
Residential properties on level ground within the CERA Green Zone are assigned one of three Technical Categories: TC1, TC2, or TC3. These categories guide foundation design based on liquefaction risks and expected performance. However, site specific investigations often reveal details that may differ from area wide classifications.
KGA conducts comprehensive subsurface investigations to provide precise foundation recommendations suited to your property’s unique conditions and your design plans.
The Importance of Geotechnical Investigations
Geotechnical investigations determine the most suitable foundation type for your project. Properties classified as TC1 or TC2 typically require shallow soil testing to assess near-surface soil strength, while TC3 sites demand deeper soil testing to evaluate liquefaction hazards.
For repairs or rebuilds, KGA collaborates with structural engineers to provide geotechnical insights that guide the design process. Existing reports created before the 2014 MBIE updates may require review and revisions to comply with current standards.