Using Seismic MASW for Subsurface Investigations

The MASW (Multichannel Analysis of Surface Waves) survey is a geophysical method used to assess the subsurface conditions of a site, particularly for geotechnical and geological investigations. When it comes to excavation & subsurface investigations, MASW surveys offer several benefits:

MASW surveys provide detailed information about the subsurface profile, including the depth and thickness of soil and rock layers. This information is crucial for excavation projects as it helps in determining the type of equipment and methods needed for excavation 

MASW surveys can determine the shear wave velocity profile of the subsurface materials. This data is essential for assessing the engineering properties of the soil and rock, such as their strength, stiffness, and bearing capacity, which is vital for designing excavation support systems 

Understanding the subsurface conditions through MASW surveys helps in identifying potential hazards or unstable areas that may pose safety risks during excavation. This information can be used to develop safety plans and avoid accidents.

Knowing the soil and rock properties enables project planners to choose the most appropriate excavation methods. For example, soft soils may require different excavation equipment and techniques than hard rock, and MASW data can inform these decisions 

 By accurately characterizing the subsurface conditions, MASW surveys can prevent unexpected delays, cost overruns, and changes in excavation plans. This helps in budgeting and cost control for the project 

MASW data can assist in optimizing the design of support structures, such as shoring and retaining walls, to ensure they are adequate for the subsurface conditions. This can lead to more efficient and cost-effective designs.

In some excavation projects, environmental considerations are critical. MASW surveys can help identify underground water tables, sensitive ecosystems, or contamination issues, allowing for environmentally responsible excavation practices.

In cases where excavation may cause subsidence or ground settlement, MASW surveys can be used to monitor changes in the subsurface over time. This enables timely responses to potential issues 

 Many local and national regulations require subsurface investigations for construction and excavation projects. MASW surveys help ensure compliance with these requirements 

 MASW data can be integrated with other geotechnical data, such as borehole information and geophysical surveys, to create a comprehensive subsurface model that enhances the understanding of the site's geology