Sensitivity

Sensitivity 1

The Sensitivity ($//<![CDATA[ \begin{array}{l}S_t\end{array} //]]>$) in Sensitivity_1 is defined as:

Schmertmann (1978), Rad and Lunne (1986), CPT in Geotechnical Practice p 68

Where:
     $//<![CDATA[ \begin{array}{l}N_s\end{array} //]]>$ is a value between 5 and 10 in the published formula, and is stored in the Sensitivity_1_Ns field.

The constant is stored on CPT_POINT_CORRELATION_PARAMETERS and CPT_PROJECT_CORRELATION_PARAMETERS tables.

Sensitivity 2

The Sensitivity ($//<![CDATA[ \begin{array}{l}S_t\end{array} //]]>$) in Sensitivity_2 is defined as:

Mayne (2007), NCHRP Synthesis 368 p 41

Where:
     $//<![CDATA[ \begin{array}{l}C_1\end{array} //]]>$ is 0.073 in the published formula, and is stored in the Sensitivity_2_C1 field.

The constant is stored on CPT_POINT_CORRELATION_PARAMETERS and CPT_PROJECT_CORRELATION_PARAMETERS tables.

This correlation of St is based on the assumption of $//<![CDATA[ \begin{array}{l}OCR< 2\end{array} //]]>$, $//<![CDATA[ \begin{array}{l}s_u=0.22\cdot \sigma'_p\end{array} //]]>$ and $//<![CDATA[ \begin{array}{l}\sigma'_p=0.33(q_t- \sigma_{v0})\end{array} //]]>$. The value of $//<![CDATA[ \begin{array}{l}S_t\end{array} //]]>$ is recorded in the Sensitivity_2 field on the CPT_DATA table.