Geotechnical Function – EQUIS.GEOTECH_UNCONSOL_UNDRAIN_READINGS

<< Click to Display Table of Contents >>

Navigation:  Geotech > Functions >

Geotechnical Function – EQUIS.GEOTECH_UNCONSOL_UNDRAIN_READINGS

Purpose

 

The EQUIS.GEOTECH_UNCONSOL_UNDRAIN_READINGS function queries the Unconsolidated Undrained (UU) test reading parameters stored in the DT_GEO_RESULT and DT_GEO_TEST_PARAMETER tables where DT_GEO_TEST.TEST_TYPE = ‘UnconsolidateUndrain’ and ‘UnconsolUndrain_Read’. Based on the available data, the function calculates other result values.

 

The EQUIS.GEOTECH_UUNCONSOL_UNDRAIN_READINGS function creates a function report called Geotechnical Unconsolidated Undrained Data. The function output data is used in the Geotechnical Unconsolidated Undrained report.

 

 

Note: This function requires reading time data to be present in the database. The time must reflect the time the reading was taken. Each reading time must be unique.

 

 

Function Details

 

This function follows two methods of reporting Stress, Strain and other result values based on the data available in the database.

 

Method 1 – If a user has entered the Stress and Strain results of a UC test into DT_GEO_RESULT.GEO_RESULT_CODE = ‘UU_Stress’ and ‘UU_Strain’ (where DT_GEO_TEST.TEST_TYPE = 'UnconsolUndrain_Read’), then the function will use the Stress and Strain results in the database. The function will query and report other test results entered in the database, such as strain rate, strength, failure strain, etc. When applicable, the function will use the available data to calculate other associated result parameters (e.g., undrained shear strength, etc.).

 

Method 2 – If data were loaded through a Data Instrumentation file (e.g., GeoTac), then only the Load Reading (DT_GEO_RESULT.GEO_RESULT_CODE = ‘UU_Load’), Deflection Reading (DT_GEO_RESULT.GEO_RESULT_CODE = ‘UU_Deflection’), Elapsed Time (DT_GEO_RESULT.GEO_RESULT_CODE = ‘elapsed_time’), and Cell Pressure readings (DT_GEO_RESULT.GEO_RESULT_CODE = ‘cell_pressure’) data are entered into the database. The function uses this information to calculate the Stress, Strain, and other results parameters (e.g., strain rate, failure strain, undrained shear strength, etc.) upon reporting.

 

The function calculates the results in the unit specified in DT_TASK_PARAMETER.PARAM_CODE = ‘comp_strength_units’. The function supports the following units:

pounds per square foot (PSF),

pounds per square inch (PSI),

tons per square foot (TSF), and

megapascals (MPa).

 

If there are multiple tasks in a facility, the function will check the DT_TASK_PARAMETER.PARAM_CODE = ‘comp_strength_units’ associated with the source sample’s task.

 

If the user has submitted Stress and Strain values directly to the DT_GEO_RESULT table (Method 1), the function will check the DT_GEO_RESULT.RESULT_UNIT associated with DT_GEO_RESULT.GEO_RESULT_CODE = ‘UU_Stress’ and convert the output results based on the unit defined in DT_TASK_PARAMETER.PARAM_CODE = ‘comp_strength_units’.

 

 

Function Outputs – UU Test Parameters

 

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

 

Field

Function
Field Name

Unit
Options

Equation (if applicable)

Stress

stress

TSF, PSF, PSI, MPa

*If piston correction is null, then piston correction is set to 0

**Initial area and length are expected to be in inches

Strain

strain

%

*Initial length value is expected to be in inches

Strain at Failure

strain_at_failure

%

Strain value associated with the maximum stress value

Unconfined Compressive Strength, qu

strength

TSF, PSF, PSI, MPa

Maximum Stress from test readings

Strain Rate

strain_rate

in/s, cm/s