Geotechnical Survey

Geotechnical Surveys for Development Projects

For a full understanding of the risks that may lie beneath the ground on a proposed site, a developer is likely to need a geotechnical survey.

This professional report will provide a comprehensive assessment of soil and rock properties, ground and groundwater conditions, pollution issues, chemical properties, natural hazards and other potential liabilities.

Safeguarding human health is a priority for a wide range of environmental agencies when it comes to breaking ground for new development and regulatory compliance is essential.

What is a Geotechnical Survey?

It’s an investigation to determine the physical properties of the soil and rock beneath a site. Before any construction begins, engineers must understand the ground conditions to ensure that the foundations are designed safely and efficiently.

By performing a geotechnical investigation, developers can gain valuable insights into a proposed development site. A geo-environmental investigation is an accurate method of enabling identification of potential issues such as low load-bearing capacity, ground instability or a high water table level.

The range of geotechnical data from these site investigations is essential for structural engineers to determine the soil structure, its structural integrity and the correct type of foundation, whether that be standard strip footings or complex piled solutions. It will inform decisions about any geotechnical engineering required to make a site deliverable.

Options might involve shallow concrete strip footings being used for load bearing soils, or in weaker soils, piled footings may be used, driving vertical columns into deeper soil to transfer loads safely. The question of how long do geotechnical surveys take depends on the individual site features.

Why Geotechnical Surveys are Essential for Developers

Undertaking geotechnical surveys early in the planning process helps to mitigate financial risks and construction delays. In the housing sector, unforeseen ground conditions are one of the most common causes of budget overruns.

A comprehensive geotechnical survey provides insights into soil properties, soil structure, site conditions, the subsurface and groundwater conditions, allowing for accurate cost estimations and material specifications.

Without this geotechnical information, developers may face structural failures, subsidence, or costly remedial works later in the life of the building, making the cost effectiveness of a geotechnical report clear.

Ground Investigation: Geotechnical Survey Methods

The procedure for conducting geotechnical surveys typically involves several stages of data collection. The result is a geotechnical report which will contain recommendations that a developer can rely on when it comes to planning a design scheme.

It will also contain information about any ground improvement work needed. This report will also answer any queries from a local planning authority about the safety of the site below the surface.

Geotechnical Survey Equipment and Methods

The initial stage involves a desk study to review geological maps and historical records of the area. Following this, site-specific fieldwork is carried out, which may include boreholes, trial pits and ground penetration tests, all requiring a range of technical excavating and boring equipment.

These methods allow specialists to extract soil samples for laboratory testing. The resulting data from site investigations helps in assessing the properties of soil, soil strength, compressibility and chemical composition, all of which influence the final design of a housing development.

Interpreting the Geotechnical Investigation Report

Once the fieldwork and lab testing are complete, the findings are compiled into a detailed report. This document provides specific recommendations for foundation design and any necessary ground improvement techniques required.

For housing providers and local authorities, this report acts as a vital piece of evidence for building control and planning departments. It ensures that the proposed structures are compatible with the land they are built on, ensuring the long-term safety of future residents.

Other Types of Geotechnical Survey Work

As well as the geotechnical soil survey, geotechnical survey companies carry out a range of other types of geotechnical survey to fulfil regulatory requirements, including marine geotechnical surveys, deep water geotechnical surveys, the offshore geotechnical survey and the offshore geophysical and geotechnical survey.

Expert Solutions for Residential Construction

Reliable geo environmental investigation is the backbone of any successful construction project. At 24Housing, we understand that providing high-quality homes starts with a solid foundation and the first step is accurate environmental data.

Geotechnical Survey Cost

The costs of this type of ground stability analysis will vary according to the scale and location of the project.

Securing Professional Geotechnical Support

Working with experienced geotechnical consultants ensures that your project complies with regulatory requirements such as relevant building regulations and industry standards.

By investing in thorough investigations, housing developers can build with confidence, knowing that their sites are secure and their structural designs are optimised for the specific conditions of the ground beneath the development.