Geotechnical drilling is a controlled site-investigation method used to create boreholes, identify subsurface layers, recover samples and perform selected in-situ tests.

It is used for buildings, industrial facilities, roads, railways, bridges, tunnels, dams, energy facilities and other infrastructure where ground conditions affect design or construction.

Core drilling recovers cylindrical rock or hard-material samples so lithology, discontinuities and engineering characteristics can be logged and evaluated.

SPT is a borehole-based dynamic penetration test that records the number of blows required for penetration over a defined interval and commonly provides a disturbed soil sample.

Depth is selected according to structure type, foundation loads, expected ground conditions, geological setting and the depth at which ground conditions no longer materially affect the engineering problem.

Yes. Depending on ground conditions and project requirements, disturbed soil samples, undisturbed samples and rock cores can be obtained for logging and laboratory testing.

Groundwater observations can be recorded in boreholes during and after drilling. Where longer-term behaviour is important, dedicated monitoring installations may be required.

Duration depends on borehole depth, geology, access, drilling method, sampling/test frequency and the number of investigation points. A project-specific programme is prepared before mobilization.

Yes. Borehole logs, samples, in-situ test data, groundwater observations and other field records can be compiled into the required investigation or geotechnical reporting format.

Equipment is selected according to access and geology and may include tracked or truck-mounted drilling rigs, core barrels, sampling tools, SPT systems and complementary field-test equipment.

Drilling is one investigation method. A geotechnical investigation is broader and can combine drilling, sampling, CPT/SPT and other in-situ tests, geophysics, laboratory testing and engineering interpretation.

Reliable subsurface data reduces uncertainty in foundation and ground-related design by identifying layer conditions, groundwater and potential geotechnical constraints before construction.

TTM TEST plans field mobilization according to project location, access, scope and equipment requirements and provides services for projects across Türkiye.

Professional planning, appropriate equipment, controlled sampling/testing and complete field records improve data quality and reduce the risk of design decisions being based on incomplete subsurface information.