ABOUT US

The company GEOTEKO Geotechnical Consultants Ltd. was founded in March 1992 by Professor Wojciech Wolski – the recognized expert in geotechnical engineering. We are a group of experienced engineers that hold adequate professional certificates in the field of geotechnical engineering, environmental engineering, and geology. GEOTEKO provides comprehensive geotechnical services that cover all aspects of investigation, including advanced field and laboratory tests and consultancy. Our activity is focused on preparation of complete geotechnical projects that comprise soil investigation, assessments, analyses and calculations in compliance with Eurocode 7 - the European geotechnical code of practice. Our portfolio includes many geotechnical projects prepared for, among others: high buildings in Warsaw like Warsaw Trade Tower and Rondo 1 Tower, Żelazny Most tailings storage facility in the Lower Silesia region - the greatest disposal of its kind in Europe, second subway line in Warsaw – currently under construction, dams and bridges e.g. the Skłodowskiej-Curie Bridge in Warsaw.

 


FIELD TESTS

Since the start of our activity 25 years ago Geoteko has been operating in the area of geotechnical field tests. Our experience has been gained both in easily accessible area as well as under atypical conditions e.g. in the course of performing the tests at sea, in the river beds, within tailings storage facilities, in the cellars /underground parts of the existing buildings. Our test equipment allows carrying out drillings, static sounding tests CPT/CPTu/SCPTu, Field Vane Tests and Flat Dilatometer Tests. We are ready for tests in every type of site conditions using light hand equipment, semi-mechanical sets or fully mechanised sets on trucks or caterpillar to drill boreholes to the depth exceeding 50 m bgl. The scope of field investigations provided by Geoteko includes as follows:

Boreholes

Small diameter boreholes to define soil and groundwater conditions of the site are made by augers.

Cone Penetration Tests (CPT/CPTu/SCPTu)

Geoteko uses Pagani sounding equipment for CPT tests with mechanical cone of Begemann’s type as well as CPTU equipment with electric cone. Additionally, seismic cone tests (SCPTu) are available for measurement of elastic soil properties.

Light Dynamic Penetrometer Tests (DPL)

The test measures soil resistance in the course of dynamic penetration of probe tip to evaluate relative density index of non-cohesive soils.

Standard Penetration Tests (SPT)

The test defines soil resistance in the course of penetration of probe tip into the bottom of the borehole and identifies type of soil of disturbed samples collected during the test.

Dilatometer Tests (DMT)

The test consists in penetration into the soil of a flat tip equipped with steel deformable membrane; stress on soil and non-deformed membrane contact as well as stress at 1.1 mm displacement of membrane centre of towards soil are measured.

Field Vane Tests (FVT)

The test consists in penetration of vane into the soil equipped with four wings perpendicular to each other; next the tip is rotated with a constant speed to shear soil. The test is used for evaluation of undrained shear strength of soft and very soft cohesive soils and organic soils.

Static Plate Tests (VSS)

The test measures soil settlement induced by loading of a defined diameter steel plate. The test evaluates strain modulus of the sub-surface soil layers to the depth of 30-50 cm bgl.

Permeability coefficient tests

The field tests of soil permeability coefficient use trial pumping method and falling head method.

Soil sampling

Soil samples’ quality is of our particular concern. We are able to collected undisturbed soil samples by means of Shelby samplers (we started years ago as precursors in Poland), in order to preserve in situ soil parameters for laboratory tests. Soil samples of natural water content or/and natural grain-size distribution can also be collected.

 

LABORATORY TESTS

Geotechnical laboratory of Geoteko operates the vast range test equipment for tests of index and mechanical properties of soil samples collected during the field investigation: like oedometers, triaxial tests apparatus, Casagrande’s apparatus, hydrometers, sieves, driers and others. The geotechnical laboratory utilizes modern testing equipment e.g. advanced triaxial apparatus with „back pressure” saturation option for soil specimen saturation and with bender elements for shear wave velocity measurements. Non-standard triaxial test solutions are also available that improve the test quality. Cylinder shaped soil specimen of a dia of approximately 3,6 cm, 5 cm or 7 cm may be tested. We are prepared to follow any test specification as ordered by the Client. Since 1997, the lab has been performing high quality tests according to international requirements. Bearing in mind the constant necessity of progress, increase of competitiveness and quality, we have implemented Laboratory Management System in consistency with ISO/IEC 17025:2005. We have been granted Accreditation Certificate of Testing Laboratory no AB962 by Polish Centre for Accreditation. The scope of standard tests to be performed in the Geotechnical Laboratory of Geoteko is as follows:

Index properties tests

  • macroscopic analysis
  • sieve analysis
  • hydrometer analysis
  • hydrometer analysis according to Prószyński approach
  • natural water content
  • plastic limit
  • liquid limit by Casagrande method - one point method
  • liquid limit by Casagrande method – five point method
  • liquid limit by cone method
  • shrinkage limit
  • min. and max. dry density
  • optimum water content and max dry density; Proctor test
  • solid density
  • bulk density
  • organic matter content
The tests are performed and the results are evaluated in consistency with the following standards: PN-88/B-04481, PN-EN ISO 14688-1:2006, PKN-CEN ISO/TS 17892-12:2009, PB-2 Geoteko, ASTM D 4318-84, ASTM D 427-83(90)

Tests of soil mechanical properties

  • UU unconsolidated undrained test
  • CU consolidated undrained test
  • CD consolidated drained test
  • Unconfined Compression test
  • evaluation of initial stiffness based on wave velocity measurements
  • oedometer test – evaluation of constrained modulus
  • evaluation of swelling pressure
  • evaluation of collapsing coefficient
The tests are performed and the results are evaluated in consistency with the following standards: PN-88/B-04481, PKN-CEN ISO/TS 17892-5, PB-3 Geoteko, PB-4 Geoteko

Chemical tests

  • organic matter content
  • calcium carbonate content
  • groundwater aggressiveness tests
The tests are performed and the results are evaluated in consistency with the following standards: PN-88/B-04481, ISO 10693, PN-EN 206-1:2003

Other tests

  • evaluation of coefficient of permeability in triaxial apparatus
  • evaluation of specific surface area (methylene blue/methylthioninium chloride)
  • evaluation of free swelling according to Holtz and Gibbs
  • evaluation of soil sorption properties

 


NUMERICAL MODELING

Geoteko offers a wide scope of services related to the numerical modelling. Thanks to the cooperation with our geotechnical laboratory the parameters even for non-standard material models may be obtained. We use the following software: Midas GTS NX, ZSoil and GeoStudio (SLOPE/W, SEEP/W, QUAKE/W).

Static analyses

Geoteko performs a wide range of analyses starting from use of simple soil models like Coulomb-Mohr to more sophisticated models with non-linear stiffness distribution (HSS model) and soft soil models (Cam Clay).

Slope stability analyses

The stability of slopes is studied. Numerical models of the area under consideration utilize 3D analysis aimed at determination of locations of the lowest stability factors within the slope not only within the analysed cross-sections.

Dynamic analyses

The analyses consider the impact of variable loads induced by mining vibrations, earthquakes, traffic or blasting.

Seepage analyses and hydrogeological modelling

The analyses define groundwater flow directions and seepage velocity; allow for detection of locations affected by the risk of internal erosion, seepage failure or piping. Steady and unsteady flow with variable coefficient of permeability depending on the saturation degree may be modelled.

Consolidation analyses

Soil displacements in time are being studied. The analyses often used for construction of embankment on soft soils for evaluation of time needed to complete displacement process. The theory of large strain and coefficient permeability variations with porosity may be used.

 

GEOPHYSICAL TESTS

Geophysical survey tests are used for: geological and hydrogeological mapping, location of underground water intakes, location of underground technical infrastructure: pipelines (metal, stoneware, concrete, plastic), cables, remains of foundations, voids, study of roads, railway embankments, bridges, runways, road embankments, tunnels as well as pollution extent mapping etc.

Electro-resistance tests

The electro-resistance surveying utilizes differences in electric potentials to identify subsurface materials. The system of electrodes in the subsoil keeps a constant potential difference. The obtained data are acquired as an apparent resistivity that reflects the current potential of the entire subsoil within the spatial electric field. The three main methods of electric resistivity surveys are:
  • vertical electric sounding (VES)
  • electric profiling (EP)
  • electric imaging/electric resistivity tomography (ERT)

Vertical electric sounding (VES)

VES is one of the more commonly used and cost effective resistivity survey methods. Current is moved through the subsurface from one current electrode to the other and the potential as the current moves is recorded. From this information, resistivity values of various layers are acquired and layer thickness can be identified. It is assumed that the subsoil is formed by horizontal layers and the significant changes of apparent resistivity values are linked with changes of soil lithology.

Electric profiling (EP)

Electric profiling seeks to determine resistivity variations on a horizontal scale. Profiling can use the same electrode spacing configurations as VES. Since changing the spacing between electrodes only affects the depth at which the survey can reach, the profiling method does not involve manipulating electrode spacing. Instead, the electrode spacing is kept constant and the entire survey is moved along a line or a "profile" to measure horizontal changes in resistivity.

Electric imaging (ERT)

Electric imaging is able to survey both vertical and horizontal changes in resistivity. This method essentially combines the other, earlier mentioned, two methods. Electrode spacing is increased and the survey is moved along a profile in order to measure both vertical and horizontal resistivity. The quantity interpretation of test is based on Res2DInv and Res3DInv systems.

Ground Penetrating Radar Tests (GPR)

GPR Test uses radar pulses to image the subsurface. This non-destructive method uses electromagnetic radiation in the microwave band (UHF/VHF frequencies) of the radio spectrum, and detects the reflected signals from subsurface structures. GPR can have applications in a variety of media, including rock, soil, ice, fresh water, pavements and structures. Geoteko uses ProEx radar by MALA Geoscience with antenna 250 and 500 MHz and Ground Vision software. The evaluation of test results is conducted using REFLEXW ver. 7.0 software

 


MONITORING

GEOTEKO focuses on the geotechnical monitoring of engineering structures, thus significant experience has been gained in the design, installation and conducting monitoring tasks on numerous construction sites all over Poland. Inclinometer measurements are carried out for slopes, landslides and deep excavations (diaphragm walls, sheet pile walls), piezometers are installed for groundwater level measurements. The displacements of benchmarks are also measured.

Geodetic survey monitoring

The periodic measurements of displacements of engineering structures are conducted for a network of benchmarks with references to the national geodetic survey system.

Groundwater monitoring

The groundwater monitoring is based on the measurement of the piezometric network and periodically controls groundwater levels and groundwater level variations. In addition groundwater transmissivity tests and pH measurements are made.

Monitoring of vertical and horizontal displacements

The monitoring consists in recording of location changes of the control points installed on the analysed structure with reference to the benchmarks of the national survey system.

Monitoring of stresses in reinforced concrete structures

The measurements utilize special tensometric gauges installed in the reinforced concrete structures for detection of stress changes within the reinforcement during construction and exploitation of the structures.

Monitoring of scratch openings

The measurements utilize crack meters installed on the structures in the area of observed openings. Periodic control of scratch openings and recording of changes of the openings in time are carried out.
 

GEODETIC SURVEY

Geoteko provides a wide range of geodetic survey measurements, using modern measurement equipment including Trimble 882 GPS measurement set, Trimble M3 Total Station tachymeter as well as levelling sets.

Mapping/topographic survey

Geoteko performs mapping.topographic survey of area elements, engineering structures, ground topography elements etc.

Inventory measurements

Geoteko provides as-built land survey and geodetic measurements of works in the area under reference: permanent marking of points.

Geodetic survey documentation

Geoteko provides and updates maps required for elaboration of the field tests project as well as develops data for marking test points in the field according to the project. We carry out tasks in the field of elaborating the received data, including bringing and scaling them into map bases, as well as preparing measurement data for placing them in the reports and studies.


 


DESIGN AND CONSULTING SERVICES

Geoteko provides a wide range of services related to the construction of structures and consulting tasks with reference to the geotechnical aspects of the construction works. The opinions, documentations and geotechnical projects are prepared in consistency with the regulation by the Ministry of Transport, Construction and Maritime Economy of 25.04.2012 on “evaluation of the geotechnical foundation conditions of structures” and according to Eurocode 7 requirements.

Plans of geological works and Geological-engineering documentations

The documentations are prepared in consistency with the “Geological and Mining Law”.

Construction designs and Executive projects

The designs relate to the geotechnical solutions for the needs of security, renovation and modernization of hydraulic engineering structures and road structures taking into account the modern technologies of soil improvement and stabilization and calculation analyses according to Eurocode 7.

Consulting services, opinions and geotechnical expertises

Geoteko provides solutions and services in the field of general, industrial, hydraulic engineering, road and railway construction issues within the scope as follows:
  • assessment of the foundation conditions of the building,
  • methods of ground improvement and amelioration of foundation conditions,
  • seepage in the foundation of structure under reference or in the body of earth dams and other hydraulic engineering structures and protection methods against negative seepage impact
  • protection against landslides.
 

MAINTENANCE SERVICE OF EQUIPMENT

The workshop of Geoteko offers comprehensive services related to maintenance, repair and modification of laboratory and field geotechnical equipment. The experience and creativity of our employees allows us to refine and modify our geotechnical equipment, and in consequence to undertake many non-standard and difficult works.


 

OUR WORK

For more than 25 years of operation, Geoteko prepared approximately 5,000 geological-engineering and geotechnical documentation, projects, expertises and other geotechnical reports. Below the projects are listed that we participated in with our skills involved in research, documentation and consulting services:

realizacje
 

OUR CLIENTS


KGHMGDDKIADHVHYDROPROJEKTMetroMPOReaisSAGCDMSmithSUEZ


 

CERTIFICATES

CONSTRUCTION LICENSES

CERTIFICATES OF THE POLISH GEOTECHICAL COMMITTEE

GEOLOGICAL LICENSES

ACCREDITATION CERTIFICATE OF THE GEOTEKO LABORATORY

 

 

CONTACT

GEOTEKO

ul. Wałbrzyska 14/16

02-739 WARSZAWA

Email: info@geoteko.com.pl

Tel: +48 22 853 14 65

Fax: +48 22 853 15 82

KRS: 0000204617

NIP: 113-00-07-283

REGON: 012558187

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