Dynamic Pore Water Pressure

 

Dynamic Pore Water Pressure Cell - DW

 

Description

A "DW" sensor measures rapidly changing positive pore water pressure in over-saturated thawing base and soil layers subjected to dynamic loading conditions. A "XD" sensor, mounted to the DW sensor, is a thermistor necessary for temperature correction of the measured pressure.The Dynamic Pore Water Pressure Gauge (DW) is a pore water pressure-sensing device consisting of a semi-conductor strain gauge piezometer.

 

Manufacturer:

Geokon 3410S Dynamic Pore Water Pressure Gauge.

 

Location and Quantity

DW/XD sensors were embedded into the base and subgrade layers near the wheelpaths of both asphalt and PCC test cells. ii. There were originally 52 DW (and 52 XD) sensors located in 4 PCC, 6 hot-mix asphalt, and 1 aggregate surface MnROAD test cells.

 

Current Status

DW/XD sensors have been used very little since installation. Many have been removed during the reconstruction of test cells.

 

MnROAD Database Table

Very limited data has been collected from this type of sensor. Data is located in database tables named: MNR.DYNAMIC_LOAD_TEST_VALUES, MNR.DYNAMIC_LOAD TEST DESCRIPTIONS, and XD_VALUES.