Unit Weight

Dry Unit Weight 1 (Sands)

Dry Unit Weight 1 (\gamma_{dry}) in Dry_Unit_Weight_1 is defined as:

\gamma_{dry}=C_1 \cdot log(q_{t1})+C_2

Mayne (2007), NCHRP Synthesis 368 p 31

Where:
     C_1 is 1.89 in the published formula, and is stored in the Dry_Unit_Weight_1_C1 field.
     C_2 is 11.8 in the published formula, and is stored in the Dry_Unit_Weight_1_C2 field.

The constants are stored on CPT_POINT_CORRELATION_PARAMETERS and CPT_PROJECT_CORRELATION_PARAMETERS tables.

This correlation of V_S is calculated only when the Soil_Type_1 field value on the CPT_DATA table is Coarse or Mixed for that row.

Saturated Unit Weight 1

Saturated Unit Weight 1 (\gamma_{sat}) in Saturated_Unit_Weight_1 is defined as:

\gamma_{sat}=C_1 \cdot log(V_s)-C_2 \cdot log (z)

Mayne (2007), NCHRP Synthesis 368 p 31

Where:
     V_s is in m/s and z is in m
     C_1 is 8.32 in the published formula, and is stored in the Saturated_Unit_Weight_1_C1 field
     C_2 is 1.61 in the published formula, and is stored in the Saturated_Unit_Weight_1_C2 field
     z is Depth 
     V_S is taken from the first of these fields with data: Shear_Wave_Velocity_Extrapolated or Shear_Wave_Velocity_1

The constants are stored on CPT_POINT_CORRELATION_PARAMETERS and CPT_PROJECT_CORRELATION_PARAMETERS tables.

This correlation is applicable to all soil types.

Saturated Unit Weight 2

Saturated Unit Weight 2 (\gamma_{sat}) in Saturated_Unit_Weight_2 is defined as:

\gamma_{sat}=C_1 \cdot log(f_s)+C_2 \cdot G_s-C_3

Mayne (2007), NCHRP Synthesis 368 p 32

Where:
     f_s is in kPa.
     C_1 is 2.6 in the published formula, and is stored in the Saturated_Unit_Weight_2_C1 field.
     C_2 is 15 in the published formula, and is stored in the Saturated_Unit_Weight_2_C2 field.
     C_3 is 26.5 in the published formula, and is stored in the Saturated_Unit_Weight_2_C3 field.
     G_s is Specific Gravity of Solids, typically 2.4 to 2.9, and is stored in the Specific_Gravity_of_Solids field on CPT_PROJECT_CORRELATION_PARAMETERS.

The constants are stored on CPT_POINT_CORRELATION_PARAMETERS and CPT_PROJECT_CORRELATION_PARAMETERS tables.

This correlation is applicable to all soil types.

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