STATIC CONE PENETROMETER 200kN/TR GEOMIL
The penetrometer 200 kN/TR manufactured by Dutch company GEOMIL is designed for geotechnical static penetration tests. Cone penetration test consists in vertical pushing the rods with special cone tip into the ground at constant rate of 2,0 cm/s ± 5mm/s. Penetrometer together with accessories is mounted on uniaxial trailer. Penetrometer is powered by compression – ignition engine 1D 81 C. Equipment is anchored to the ground with the use of disk bits. Penetrometer is provided with measuring – recording device GME500 IP65 which records parameters measured during the test. It has to be mentioned that the described equipment is brand new as it was manufactured in 2009.
Penetrometer 200 kN/TR GEOMIL
The most important technical specifications of CPTU are presented in the table below.
Technical specifications of CPTU penetrometer
cone of 60° apex angle
|cone base area||1 000 mm2|
|length of cylindrical area||7,0 – 10,0 mm|
|cone length||24,0 – 31,2 mm|
|cone base Ø||34,8 – 36,0 mm|
|friction surface||150 cm2|
|length of friction sleeve||133,7 mm|
|friction sleeve Ø||35,7 mm|
During test system of sensors placed in cone (load cells of friction sleeve and cone as well as sensors for pore pressure and inclination) connected with recording device GME500 IP65 records values of:
point resistance qc
local friction fs
dynamic pore pressure u
New measurement device has producer certificate however, according to PN-B-04452:2002 standard it is sent for re-calibration after each 3 000 m of sounding but not less often than once each six months. Condition of the cone and its correct dimensions (see Table 1) are checked each time before test. Before test filter and empty spaces are de-aerated and filled with fluid (e.g. hydraulic oil). Before pushing cone into soil the recording device executes automatic calibration and determine „zero” of the measurement equipment. Identical procedure is repeated after test. These measurements allow to obtain measuring error, which should not exceed 5%. Inclination of rods is controlled during the test and it should not be bigger than 2%.
Data recording and graphic presentation of test results is made with the use of GEOMIL software: CPTest and CPTask. Interpretation of test result is executed according to binding standards with the use of new software for CPT test interpretation CPT Star produced by Sof-Projekt company. This software enable for efficient elaboration of test results, calculation of soil parameters as well as graphic edition of test’s card. CPTask and CPT Star also enable data export to excel files.