CURRENT REFERENCES · SELECTIONANONYMISED · STRUCTURE · REGION · SCOPE

Current references

Selected projects from 2025 and 2026 – wind energy, cable routes and crossings, building construction, heat sources and environment. The entries state the structure, region and scope, not the clients. Further details on individual projects are available on request, provided the clients agree.

FIELD

01 Geotechnics 2026 SAXONY-ANHALT HOME PAGE

Wind farm with several WTGs, Saxony-Anhalt

Wind farm with several wind turbines with overall heights of up to approx. 265 m on shallow foundations of 24 to 29 m diameter, located on a ground moraine plateau in Saxony-Anhalt, geotechnical category GC 3. GeoStudys investigated each turbine location with one window sampling borehole (RKS) and several cone penetration tests (CPT) and determined location-specific parameters, rotational stiffnesses, settlements and tilts. A facies change between glacial till and glaciofluvial sands resulted in a different bearing stratum for each foundation.

CPT and RKS per location
Rotational stiffness
Settlement and tilt

Geotechnical cross-section of a WTG location: key borehole and three cone penetration tests, layer boundaries from the mechanical contrast — anonymised — Geotechnical cross-section of a WTG location: key borehole and three cone penetration tests, layer boundaries from the mechanical contrast – anonymised

02 Geotechnics 2026 · ONGOING BRANDENBURG HOME PAGE

Underground cable route for a data centre, Brandenburg

Underground cable route several kilometres long between a substation and a data centre in Brandenburg, with nine horizontal directional drilling (HDD) crossings under a motorway, a lake, ditches and tracks. GeoStudys investigated the route with approx. 55 window sampling boreholes, approx. 30 dynamic probing tests, cone penetration tests and geoelectrical surveys, specified the geotechnically required minimum axis depths of the crossings and determined the thermal conductivity of the soil along the route for cable rating and the specific electrical soil resistivity for earthing and corrosion protection. Soft layers of a kettle hole in the glacial till govern the axis depth of one crossing.

55 RKS
30 DPH/DPL
CPT
Geophysics (geoelectrics)
9 HDD crossings

Longitudinal section of an HDD lake crossing with ground model and borehole columns — anonymised — Longitudinal section of an HDD lake crossing with ground model and borehole columns – anonymised

03 Geotechnics 2026 SAXONY-ANHALT HOME PAGE

Two battery storage systems at ground-mounted PV plants, Saxony-Anhalt

Two battery energy storage systems at ground-mounted photovoltaic plants in Saxony-Anhalt, with several dozen battery containers of approx. 40 t each. GeoStudys investigated both sites with 20 window sampling boreholes, 16 cone penetration tests and 16 heavy dynamic probing tests (DPH) and prepared the geotechnical reports with foundation recommendations for the containers. The decisive factors were the undulating topography, local organic layers and the resulting differential settlement between the containers.

Containers of approx. 40 t each
20 RKS
16 CPT
16 DPH

Schematic geotechnical cross-section of a storage site: medium sands with gravelly layers — anonymised — Schematic geotechnical cross-section of a storage site: medium sands with gravelly layers – anonymised

04 Geotechnics 2026 · ONGOING BRANDENBURG HOME PAGE

District heating river crossing by microtunnelling, Brandenburg

District heating inverted siphon by microtunnelling beneath a federal waterway in Brandenburg: four jacking pipes up to DN 900 over approx. 80 m, launch and reception pits approx. 10 m deep (geotechnical category GC 3). GeoStudys is investigating with four CPTu soundings to 25 m, two window sampling boreholes to 11 m and a temporary groundwater monitoring well, and is carrying out the geotechnical verifications for the excavations and excavation support. The governing factors are uplift and hydraulic heave at an excess hydraulic head of approx. 8 m, and a depth of cover of only 3 m below the river bed.

2 RKS
4 CPT
Deep excavations
Geotechnical verifications

Longitudinal section of the river crossing by microtunnelling: ground surface and river, jacking pipes, launch and reception pits with sheet piling, exploration points with final depth and required investigation depth, vertically exaggerated — Longitudinal section of a river crossing by microtunnelling — jacking axis, excavation pits and investigation depth to DIN EN 1997-2, anonymised

05 Feasibility 2026 BALTIC COAST, SCHLESWIG-HOLSTEIN HOME PAGE

Heat sources for a hotel resort, Baltic coast of Schleswig-Holstein

Hotel with villa and swimming pool on the Baltic coast of Schleswig-Holstein, total heat demand approx. 2 900 MWh/a with a year-round base load. In the study, GeoStudys compared a two-layer horizontal collector (approx. 3 700 m²), a BHE field with simulation over 25 years, energy piles, a seawater heat pump (approx. 450 kW) and an air-source hybrid solution, including the permitting route. With only approx. 18 % thermal recharge from cooling, the demand cannot be covered by ground coupling alone; the seawater solution is preferred.

Total heat demand approx. 2 900 MWh/a
5 source options
Seawater heat pump approx. 450 kW
Permitting route

BHE field simulation over 25 years — brine temperature and heat extraction — BHE field simulation over 25 years – brine temperature and heat extraction

06 Geotechnics 2026 BRANDENBURG

Railway crossing by pipe jacking, Brandenburg

Trenchless cable crossing beneath two railway lines for a ground-mounted photovoltaic plant in Brandenburg; pipe jacking drive approx. 60 m. GeoStudys prepared the ground investigation report with 2 window sampling boreholes and heavy dynamic probing tests to 7 m, a settlement forecast for the track area and recommendations for the launch and reception pits with sheet pile support. The pipe axis lies in very stiff glacial till; groundwater was not encountered down to final depth.

2 RKS/DPH to 7 m
Drive approx. 60 m
Settlement forecast for the track area

Settlement trough in the track area for three volume loss assumptions compared with the limit values of the railway regulations

07 Feasibility 2026 BALTIC COAST, SCHLESWIG-HOLSTEIN HOME PAGE

Ground-source heat study for a residential complex with four villas, Baltic coast of Schleswig-Holstein

Heat source concept for four multi-family villas with a shared underground car park on the Baltic coast of Schleswig-Holstein, heat demand approx. 1 600 MWh/a, cooling demand approx. 600 MWh/a. GeoStudys prepared the feasibility study with its own 2D frost model for a two-layer horizontal collector beneath the floor slab (approx. 5 700 m²) and a simulation of the BHE field with approx. 30 borehole heat exchangers of 150 m each over 25 years. In the simulation, with priority recharge of the waste heat from cooling, the BHE field remains within the permissible temperature range over 25 years.

Two-layer collector approx. 5 700 m²
approx. 30 BHEs of 150 m each
Simulation over 25 years

Temperature field of the two-layer collector beneath the floor slab, late winter — simulation — Temperature field of the two-layer collector beneath the floor slab, late winter – simulation

08 Geotechnics 2026 BALTIC COAST, SCHLESWIG-HOLSTEIN

New hotel with underground car park, Baltic coast of Schleswig-Holstein

Hotel with villa, ancillary buildings and a large underground car park on the Baltic coast of Schleswig-Holstein. GeoStudys prepared the geotechnical report (geotechnical category GC 3) with 8 window sampling boreholes to 12 m, 4 heavy dynamic probing tests, evaluation of existing exploration records and foundation calculations for each building. Because of the organic lake mud beneath the marine sands, the hotel will be founded on piles in the glacial till, allowing for negative skin friction; a combined raft foundation is sufficient for the villa.

8 RKS to 12 m
4 DPH
Piled foundation in glacial till
GC 3

Borehole profile with heavy dynamic probing: marine sands over silty organic lake mud over glacial till – anonymised

09 Geotechnics 2026 SOUTHERN BRANDENBURG

Hotel extension with parking level, southern Brandenburg

Extension of a hotel with a semi-sunken parking level (approx. 600 m²) in southern Brandenburg. GeoStudys prepared the geotechnical report to DIN 4020 with 7 window sampling boreholes and 3 heavy dynamic probing tests to 10 m, together with an uplift balance for the parking level. The foundation level lies permanently in the groundwater of a highly permeable fluvial sand, and the site lies within a designated flood area; the decisive factors were therefore a watertight concrete structure and safety against uplift at the design flood.

7 RKS
3 DPH to 10 m
Base slab in groundwater
Uplift verification HQ100

Uplift balance of the parking level: ground surface, groundwater, design flood HQ100 and pressure head beneath the base slab

10 Geotechnics 2025 BRANDENBURG

Cycle and pedestrian bridge over a federal road, Brandenburg

New cycle and pedestrian bridge over a federal road in Brandenburg, comprising an arch bridge, a frame structure and two ramps. GeoStudys carried out the main ground investigation with 4 cored boreholes to 15 m, 6 window sampling boreholes to 7 m and 10 cone penetration tests to 20 m, and prepared the ground model, four homogeneous zones, design values of bearing resistance and a settlement forecast. Groundwater was not encountered down to the final depth of 15 m.

4 cored boreholes to 15 m
10 CPT to 20 m
Bearing resistance per foundation element

Schematic geotechnical cross-section along the bridge axis from cored boreholes and window sampling boreholes — anonymised — Schematic geotechnical cross-section along the bridge axis from cored boreholes and window sampling boreholes – anonymised

11 Environment 2025 BRANDENBURG HOME PAGE

Excavated soil for a new bridge, Brandenburg

For a new bridge over a federal road in Brandenburg, GeoStudys assessed the excavated soil from an environmental perspective. 10 composite samples of the near-surface made ground were analysed for heavy metals, PAH, PCB, hydrocarbons and EOX, with eluate to DIN 19529; on this basis, the classification under the Substitute Building Materials Ordinance (EBV) and a disposal plan were prepared. Four samples show elevated PAH contents.

10 composite samples
EBV BM-0 to BM-F3
Disposal plan

Classification of the ten composite samples under the Substitute Building Materials Ordinance — table from the report — Classification of the ten composite samples under the Substitute Building Materials Ordinance – table from the report

12 Geotechnics 2025 BERLIN

Commercial and office building with basement, Berlin

Multi-storey commercial and office building with basement in Berlin, footprint approx. 2 300 m², foundation level approx. 2.8 m below ground level. GeoStudys investigated the ground with 6 window sampling boreholes to 9 m and 3 heavy dynamic probing tests and prepared the geotechnical report to DIN 4020 with foundation recommendation, modulus of subgrade reaction and settlement forecast. The decisive factor was made ground up to approx. 4.5 m thick with embedded concrete slabs, which required soil replacement.

6 RKS to 9 m
3 DPH
Soil replacement
Settlement forecast

Borehole profile with heavy dynamic probing: made ground with concrete layer over silt and fine sand – anonymised

INFORMATION FROM REPORTS AND PROJECT DOCUMENTS · FIGURES ROUNDED, PARTLY MODIFIED FOR ANONYMISATION · LOCATIONS AT REGIONAL LEVEL · SHEETS WITHOUT COORDINATES OR TITLE BLOCK

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