Ground Investigation
The Terrier is a compact, track-mounted dynamic sampling rig designed for near-surface geotechnical and environmental investigations. Its lightweight and highly maneuverable design makes it particularly well-suited for restricted-access sites, such as urban developments, brownfield land, rail corridors, and other areas where larger drilling rigs cannot operate. Despite its small footprint, the rig is capable of carrying out a range of tasks including dynamic sampling with window and windowless samplers, Standard Penetration Testing (SPT) in accordance with BS EN ISO 22476-3, and concrete coring through hardstanding and paved surfaces. Many models also offer a modular configuration, allowing the rig to be disassembled and manually transported into basements, internal spaces, or other confined areas. The Terrier is commonly used for collecting high-quality soil samples for geotechnical logging, classification, and environmental testing, and can be configured to install shallow gas and groundwater monitoring wells. Typical sampling depths range from 6 to 8 metres, depending on ground conditions. Its low ground pressure, quiet operation, and minimal environmental impact make it an ideal solution for investigations on sensitive or constrained sites. The Terrier offers a practical, efficient approach to small- to medium-scale ground investigation work while complying with relevant British Standards such as BS 5930 and BS EN ISO 14688.
Dynamic Sampling
Dynamic Cone Penetrometer Testing
Dynamic Probe Tesing (DPT)
Dynamic sampling - also referd to as window or windoless sampling - is a versatile ground investigation technique used to recover near-continuous cores of soil for geotechnical and environmental assessment. The method involves driving a steel sampling tube into the ground using a drop weight or percussive system, with minimal disturbance
Dynamic sampling - also referd to as window or windoless sampling - is a versatile ground investigation technique used to recover near-continuous cores of soil for geotechnical and environmental assessment. The method involves driving a steel sampling tube into the ground using a drop weight or percussive system, with minimal disturbance to the soil structure. It is particularly well-suited for soft to medium-dense soils and is commonly employed in site investigations where speed, access, and cost-efficiency are priorities. Dynamic sampling can be used to obtain samples for visual inspection, laboratory classification, moisture content, and contamination analysis. The process is typically carried out in accordance with BS 5930:2015 + A1:2020 (Code of Practice for Ground Investigations), which outlines good practice for soil sampling, logging, and in-situ testing. For laboratory testing, recovered samples may also be assessed under BS EN ISO 17892, which covers the determination of index and mechanical properties of soils.
Dynamic Probe Tesing (DPT)
Dynamic Cone Penetrometer Testing
Dynamic Probe Tesing (DPT)
Dynamic probe testing is an in-situ geotechnical investigation method used to assess soil strength and relative density, particularly in granular or mixed soils. The test involves driving a steel cone-tipped rod into the ground using a standardized dynamic force, typically a drop hammer of known mass and fall height. The number of blows r
Dynamic probe testing is an in-situ geotechnical investigation method used to assess soil strength and relative density, particularly in granular or mixed soils. The test involves driving a steel cone-tipped rod into the ground using a standardized dynamic force, typically a drop hammer of known mass and fall height. The number of blows required to drive the cone a specified depth—usually 100 mm—is recorded at regular intervals. This provides a penetration resistance profile, which can be correlated with soil type, compaction, and bearing capacity. Dynamic probing is especially useful for shallow ground investigations, rapid profiling, and compaction control, and is often used in conjunction with other sampling methods. The test is carried out in accordance with BS EN ISO 22476-2:2012 (Geotechnical investigation and testing – Field testing – Part 2: Dynamic probing), which defines procedures for various types of dynamic probes, including light (DPL), medium (DPM), heavy (DPH), and super-heavy (DPSH) systems.
Dynamic Cone Penetrometer Testing
Dynamic Cone Penetrometer Testing
Dynamic Cone Penetrometer Testing
DCP testing is used to gain a greater understanding of the structural integrity of the pavement system. It determines the stability and support of subbase materials beneath bound pavement layers by measuring the penetration rate per each drop of the hammer.
Our crew can perform DCP testing at the base of cores, trial pits, in soft verges,
DCP testing is used to gain a greater understanding of the structural integrity of the pavement system. It determines the stability and support of subbase materials beneath bound pavement layers by measuring the penetration rate per each drop of the hammer.
Our crew can perform DCP testing at the base of cores, trial pits, in soft verges, or in soft central reservations in accordance with the Design Manual for Roads and Bridges CS 229 Data for pavement assessment.