<< Click to Display Table of Contents >> Navigation:  Geotech > Functions > Geotechnical Function – EQUIS.GEOTECH_CPT_DISSIPATION_DATA

Purpose

 

The EQUIS.GEOTECH_CPT_DISSIPATION_DATA function queries the results of a Cone Penetration Test (CPT) Dissipation test to calculate the pore pressure and normalized excess pore pressure results. The test results are queried from the DT_GEO_RESULT, DT_GEO_TEST, and DT_GEO_TEST_PARAMETER tables.

 

The EQUIS.GEOTECH_CPT_DISSIPATION_DATA function creates a function report called Geotechnical CPT Dissipation Data. It is also used in the Geotechnical CPT - Pore Pressure Dissipation report.

 

 

Calculation Details

 

The function uses the Dissipation pore pressure (DT_GEO_RESULT.GEO_RESULT_CODE = ‘cpt_dis_pp’) to report the Pore Pressure. The DT_GEO_RESULT.GEO_RESULT_CODE = ‘cpt_dis_pp’ values must be stored in KPa. The Normalized Excess Pore Pressure values are calculated by using an Initial Pore Pressure Override value (DT_GEO_TEST_PARAMETER.PARAM_CODE = ‘cpt_dis_initial_pp_override’). If this value is not provided, then the function uses the initial pore pressure reading to determine the Normalized Excess Pore Pressure.

 

A Water Depth value must be provided in DT_GEO_TEST_PARAMETER.PARAM_CODE = ‘cpt_dis_assu_wat_dep’ for the function to compute. The water depth is assumed to be in the same units as the associated DT_GEO_TEST.DEPTH_UNIT.

 

The function outputs the parameters based on the unit defined in DT_TASK_PARAMETER.PARAM_VALUE for DT_TASK_PARAMETER.PARAM_CODE = ‘cpt_output_unit’. The PARAM_VALUE must be either ‘E’ for English, or ‘M’ for Metric. If the value is empty, then the function will report the results in English units.

 

 

 

Function Outputs – CPT Dissipation Parameters

 

The following table lists the CPT dissipation parameters that the EQUIS.GEOTECH_CPT_DISSIPATION_DATA function outputs, including function field name, associated unit, and equation used (when applicable).