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CPT Analysis

In the CPT Analysis tab, the global CPT parameters are defined:

  • CPT Classification type (Robertson 1986, Robertson 1990, Schneider 2008 options are available)
  • Atmospheric Pressure
  • Net Area Ratio
  • Cone Factor
  • Filter Data parameters
These parameters can also be edited (globally) from the CPT Input dialog, by clicking on the CPT Options button.

Filter Data

The Bandwidth Thickness and Filter Constant can be defined. The filtering procedure is outlined in the CPT Theory Manual.

Units

The following unit convention is used for the input properties parameters for CPT interpretation calculations in Settle3. Imperial input data is converted to SI units in the engine.

Unit System

Depth

qc

fs

u2

SI

m

MPa

kPa

kPa

Imperial

ft

tsf

tsf

psi


The unit convention for the output results is summarized below.

Parameter

Metric Unit System

Imperial Unit System

Depth

m

ft

Cone resistance, qc

MPa

tsf

Sleeve resistance, fs

kPa

tsf

Corrected cone resistance, qt

MPa

tsf

Gamma

kN/m3

pcf

Total overburden stress

kPa

tsf

Equilibrium pore pressure

kPa

tsf

Effective overburden stress

kPa

tsf

Shear wave velocity

m/s

ft/s

Hydraulic conductivity

m/s

ft/s

Constrained modulus

kPa

tsf

Young’s modulus

kPa

tsf

Maximum shear modulus

kPa

tsf

Undrained shear strength

kPa

tsf

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