Why P-S suspension Logging?

PS (P-wave and S-wave) suspension logging is used to measure compressional and shear wave velocities in soil and rock formations, providing valuable information for geotechnical investigations, civil engineering projects. This technique offers advantages over surface methods, enabling precise measurements at specific depths within the borehole and providing detailed stratigraphy information.

Post Processing Velocities

The use of PS suspension logging is highly recommended for specific projects for many reasons:

1. Accurate and Specific Measurements:

• Depth-Specific: PS suspension logging allows for direct measurements of P-wave and S-wave velocities at any chosen depth within the borehole, unlike surface methods that rely on interpretation and integration through the soil column.

• No Surface Noise Interference: Because the source and receiver are within the borehole, the system is less susceptible to surface noise and vibrations, leading to more accurate measurements.

2. Detailed Geotechnical Information:

• Stratigraphy Characterization: The technique provides detailed information about the stratigraphy of the soil and rock, including identification of layers and their properties.

• Elastic Properties: By measuring wave velocities, elastic properties like shear modulus, bulk modulus, Poisson's ratio, and compressibility can be calculated.

• Small Strain Moduli: PS logging is crucial for determining small strain moduli, including Gmax, which is important for understanding soil behavior under stress.

3. Advantages over Conventional Methods:

• Cost-Effective and Fast: PS suspension logging is a fast, affordable, and actionable technique that provides detailed geotechnical information.

• High-Energy Source: The method utilizes a high-energy wave source that provides better resolution and signal strength than conventional sonic probes.

• Low-Frequency Acquisition: The low-frequency acquisition technique is particularly well-suited for studying unconsolidated sediments and soft soils.

• Repeatability and Fixed Distance: The repeatable signal and fixed distance between receivers in the probe enhance the accuracy of the velocity measurements.

4. Applications:

• Civil Engineering: Foundation studies for bridges, buildings, and abutments.

• Seismic Site Response: Assessing the seismic response of a site.

• Dam Safety: Investigating the safety of dams.

• Offshore Site Investigations: Determining the stiffness of offshore soils for wind farms and other projects.

• General Geotechnical Investigations: Characterizing soil and rock properties for various engineering applications.