Commonly used in soft soils to retrieve soil samples for detailed analysis

Similar to Dynamic Probing, where a solid steel rod is driven into the ground, Dynamic Windowless Sampling drives an open steel tube into the ground with a hydraulic driver.

The hollow steel tube enables sampling of soft soils within a plastic liner which slots into the tube. The liner serves two purposes: it enables extraction of the soil sample from the hollow steel tube, and it also contains the soil.

The tube can then either be split on-site for examination and logging or kept intact for transport to a laboratory for in-depth analysis and testing.

Where the ground is unstable and prone to collapse, temporary steel casing can be installed. On completion of drilling, the boreholes can be installed with instrumentation to monitor ground movement, groundwater levels, water quality, and gas.

Dynamic Windowless Sampling may be carried out by hand-held percussive samplers or small tracked rigs that can pass through a standard domestic doorway.

With some tracked rigs, it is also possible to carry out Standard Penetration Testing (SPT) and Dynamic Probing, providing both qualitative and quantitative data.

The soil samples collected in the tube can be laid out to provide a continuous representation of the ground profile from surface to the end depth of the borehole.

The recovered soil samples are logged by our engineering team and selected samples are packaged and sent to a laboratory for specialist testing.

Dynamic Windowless Sampling is typically conducted to a depth of 5m, or a maximum of 10 to 15m.

It is ideally suited where rock is not expected at shallow depths, and where a limited depth of investigation is required.

It is also ideal where there is restricted access, such as in small gardens or buildings. Moreover, this method of sampling produces minimal ground disturbance.