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CPeT-IT User's Manual v.3.0

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The software's main window is divided into two areas. In the left area, under the title CPT file manager, it displays a list with the available CPTU data and in the large right area CPeT-IT will display input and output results in both tabular and graphic format. This way you can always have an instant preview of your data and estimations for quick reference.

CPeT-IT application window

CPeT-IT application window

The right hand side of the main window shows tabular output in the top half and plots in the lower half. The top half has two tabs, one for Basic Results and the other for Estimated Parameters. The relative size of the top and lower windows can be adjusted by clicking and dragging the horizontal dividing bar.

When the Basic Results tab is activated, the table shows the measured CPT input data and basic output data as a function of depth. The lower half shows the various Basic Results - Data Plots.

Data plots

At the base of the main window, the Raw data plots are displayed along with tabs to show, Basic plots, Normalized plots and SBT plots.

Raw data plots: This window displays plots of measured, cone tip resistance, qc, sleeve friction, fs, and penetration pore pressure, u, and cross correlation between qc and fs. A hydrostatic pore pressure line is also shown on the CPT pore pressure plot to act as reference and is determined based on the user input of ground water level (GWL). The cross correlation plot is a comparison between the qc and fs profiles. Since the center of the friction sleeve is physically several centimeters behind the cone tip (actual distance will depend on cone size, e.g. 10 cm² or 15 cm²), most contractors offset the data so that both the tip, friction and pore pressure are shown at the same depth, rather than the same time. The cross correlation plot provides a check to evaluate if the offset has been fully effective or to determine if the data set has not been corrected for the physical offset. If the data has been fully offset, the cross correlation should show a maximum values at zero offset. In highly interbedded profiles, the cross correlation may not always show a clear maximum value.

Basic Plots: This window displays plots of corrected, qt, friction ratio, Rf, penetration pore pressure, u (with reference hydrostatic profile based on user input GWL), normalized SBTn Ic, and non-normalized SBT.

Normalized Plots: This window displays plots of normalized CPT parameters, normalized tip resistance, Qtn, normalized friction ratio, Fr, normalized pore pressure parameter, Bq, normalized SBTn Ic and normalized SBTn.

Mod. Norm. Plots: This windows displays the latest normalized plots

SBT plots: This window displays the CPT results on both the non-normalized and normalized CPT Soil Behaviour Type (SBT and SBTn) charts suggested by Robertson et al., 1986, and Robertson, 1990. When the cursor (with "SHIFT" key pressed) is moved over the CPT data, the depth of the data point is displayed and the associated line of data are highlighted in the table above.

Bq plots: This window displays the CPTu results on both the non-normalized and normalized CPT Soil Behavior Type charts based on normalized pore pressure parameter, Bq.

Schneider Plots: This window displays soil classification plots suggested by James Schneider et al. based on normalized excess pore pressure.

HPT Plots: This windows will display a set of plots from Hydraulic Profiling Tool

When the Estimated Parameters tab is activated, the table shows the calculated geotechnical parameters based on the user input constants. The lower half shows plots of estimated parameters versus depth under three tabs, Estimated Plots 1, Estimated Plots 2 and Estimated Plots 3.

As with all plots the scales can be adjusted (see Customizing plots).