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Geotechnical survey

Cone penetration test allows to investigate phisycal and mechanical properties of core samples in in-situ condition. CPT performs the bellow indicated analyses.

  • Study of geological section and identification of engineering targets, outline of distribution of different soil types
  • Evalute resistivity at the low and pile and its leteral surface. Acquired data are processed by "CPT task" software

As a result the following parameters are defined:

  • Cone resistance (qc)
  • Local friction (fs)
  • Pore pressure (u)
  • Relationship of lateral friction to cone resistance (Rf)

Standard Penetration Test enables to study physical and mechanical properties of core in in-situ condition

The following equipment is used during the testing:

  • Automated hummer and steel bucket
  • Hook activated while hummer upward movement
  • Split barrel
  • Special steel rods

Technical parameters:

  • Weight of hummer - 63.5 kg
  • Dip angle of split barrel - 60º
  • Free falling height of hammer - 0.76 m
  • Length (split barrel) - 0.73 m

The Menard-type pressuremeter test (PMT) consist of inserting a pressuremeter probe and then applying nitrogen gas to deform a flexible membrane. Deformation measurements are read by a control panel that measures and volume variations occuring as a result of soil deformation. The test can be made on all types of soil and provides in-situ parameters for deformability and readings are made automatically by "Geospad" system.

The vane shear test is an in-situ goetechnical testing methods used to estimate the undrained shear strength of fully saturated clays in wells. The test is relatively simole, quick, and provides a cost-effective way of estimating the soil shear strength; therefore, it is widely used in geotechnical investigations. Under special condition, the vane shear test can be also carried out in the laboratory on undisturbed soil specimens; however, the use of the vane shear test in in-situ testing is much more common.

The Static Plate Load Test is applied in eathworks and foundation engineering as well as road construction in order to determine load settlement lines and by this to evaluate the deformability and the load capacity of the soil.

Horizontal inclinometers are used to obtain high resolution profiles of settlement or heave. Typical applications include monitoring settlement and heave under storage tanks, embankments, dams, and landfills.

The Digitilt horizontal inclinometer system consists of inclinometer casing, a horizontal probe, control cable, pull cable, and a readout unit. The inclinometer casing is installed in a horizontal trench or borehole with one set of grooves oriented vertically. The probe, control cable, pull-cable, and readout unit are used to survey the casing.

A survey is conducted by drawing the probe from one end of the casing to the other, halted in its travel at half-meter intervals for inclination measurements (two foot intervals are used for English-unit probes). The first survey establishes the initial profile of the casing. Subsequent surveys reveal changes in the profile if ground movement has occurred.

The horizontal inclinometer probe employs a force-balanced servo-accelerometer that measures inclination from horizontal in the plane of the probe wheels. A change in inclination indicates that movement has occurred. The amount of movement is calculated by finding the difference between the current inclination reading and the initial reading and converting the result to a vertical distance.