Site Investigations

A geotechnical site field investigation is necessary for various reasons, including identifying soil and rock properties, geological hazards, and other ground conditions that can impact the design, construction, and safety of structures or infrastructure.

In New Zealand, the geotechnical site investigation process is generally guided by several codes and standards, including:

1. NZS 1170.5

Structural design actions – Earthquake actions – New Zealand: This code provides guidelines for determining the seismic hazard at a site and assessing the resulting earthquake actions on structures. A geotechnical site investigation is essential to identify the site-specific seismic hazard, soil and rock properties, and other ground conditions that can impact seismic performance.

2. NZS 4404:2010

Land development and subdivision infrastructure: This code provides guidelines for the planning and design of land development and subdivision infrastructure. A geotechnical site investigation is necessary to identify the ground conditions that can affect the design of infrastructure, including roads, bridges, retaining walls, and stormwater systems.

3.NZS 4219:2009

Seismic performance of engineering systems in buildings: This code provides guidelines for assessing the seismic performance of engineering systems in buildings, such as foundations, walls, and floors. A geotechnical site investigation is necessary to identify the site-specific seismic hazard, soil and rock properties, and other ground conditions that can impact the seismic performance of these systems.

4. Building Code

The New Zealand Building Code is a set of performance standards that all buildings must meet. It includes requirements for structural strength, durability, and safety. A geotechnical site investigation is often required to ensure compliance with the Building Code, particularly in areas with high seismic hazard.

In summary, a geotechnical site field investigation is essential for ensuring the safety, compliance, and cost-effectiveness of construction projects in New Zealand. The investigation process is generally guided by several codes and standards, depending on the specific project requirements.

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