Ģeotehniskā un ģeoloģiskā izpēte

GEOTECHNICAL AND GEOLOGICAL RESEARCH

Geotechnical/geological surveys are a service that is often needed during the development of a project. In order to avoid the need for subcontractors, Ceļuprojekts AS provides not only design services, but also related services, including geotechnical investigations, geological investigations and topographical surveys. The company has certified staff, the necessary equipment for geotechnical investigations and a geotechnical laboratory.

  • Geotechnical research for transport structures (motor roads, streets, bridges, overpasses, viaducts, tunnels, airport runways, parking lots).
  • Geotechnical research for civil structures (multi-storey and low-rise office, public, residential and industrial buildings, villages with detached houses, petrol stations, biogas cogeneration stations, sports grounds, fish and fire ponds, etc).
  • Geotechnical research for engineering communication objects (water supply and sewerage networks, power supply substations, mobile communication masts and towers, etc).
  • Geotechnical research for the development of a detailed spatial planning and other types of objects.
  • Geotechnical calculations (calculations for mutual comparison, selection and recommendations for foundation types; estimates of foundation structures, calculations of pile load-bearing capacity).
  • Geological research of building materials and their raw materials - sand, sand - gravel, dolomite, gypsum and clay, as well as sapropel, peat and other mineral deposits for obtaining mineral deposit passports and extraction limits from the State Environmental Service.
  • Geological research of surface water bodies (ponds, water bodies), if in the course of their construction the extraction of mineral deposits is envisaged.
  • Development of mineral deposit extraction and recultivation designs.
  • Calculation and inventory of mineral resources remaining in the deposit (quarry).

The following methods are used in the research work:

Drilling and sampling:

  • rotary drilling with a core to the depth of up to ~50 m;
  • rotary drilling with a twist drill (auger) to the depth of ~50 m;
  • vibratory drilling with a ground bar to the depth of ~10 m;
  • sampling of subsoil and rocks of undisturbed and disturbed structure with ground drills, twist drills and crown drills for determination of physical and mechanical properties of subsoil in the laboratory.

Subsoil area (in-situ) research methods:

  • Static probing (CPT/CPTu) with or without pore pressure measurement to the depth of up to ~ 40 m
  • Probing with a flat (Marchetti) dilatometer for determination of high-precision deformation modulus and additional parameters to the depth of up to ~ 30 m
  • Dynamic probing with light (DPL), medium (DPM) and heavy weight (DPSH) methods to the depth of up to ~30 m
  • Standard penetration probing (SPT) in boreholes with a depth of up to ~35 m
  • Determination of shear resistance (FVT) with a vane in weak subsoils to the depth of up to ~10 m
  • Determination of the California bearing ratio (CBR) of road and street component layers
  • Determination of load-bearing capacity and compaction parameters (Ev2 and Evd) of road and street component layers with static plate equipment and light falling weight deflectometer
  • Pressuremeter tests to determine the modulus of elasticity to the depth of up to ~50m
GEOTECHNICAL LABORATORY

In addition to exploration, we offer geotechnical laboratory services.

Geotechnical Laboratory of JSC "Ceļuprojekts" was established in 2014. In 2015, its services in the field of testing physical and mechanical properties of soil and mineral materials were accredited by “Latvijas Nacionālais akreditācijas birojs” (LATAK Nr. T-520).

The existence of our own laboratory allows to perform a complex of geotechnical and geological research works in a timely manner and in a controlled quality. The laboratory has modern equipment and instruments that ensure accurate measurements and obtainment of high-quality data.

We offer the following laboratory testing methods:

Testing of physical properties of subsoil and mineral materials:

  • Granulometriс composition
  • Natural humidity (water content)
  • Atterberg limits (plasticity and consistency parameters)
  • Maximum density and optimal humidity (Proctor test)
  • Organic matter content
  • Filtration coefficient
  • Particle density, bulk density, etc

Testing of mechanical properties of subsoil and mineral materials:

  • Compressibility and consolidation parameters (Oedometer test)
  • Angle of shearing resistance and internal friction and shear resistance (Direct shear test)
  • Supporting capacity and compaction (Static plate test)

Testing of building materials:

  • Los Angeles coefficient
  • Magnesium sulphate index
  • Flatness or shape index
  • Proportion of crushed and broken surfaces

The accreditation certificate can be viewed here.