Static Pore Water Pressure

 

Static Pore Water Pressure Cell - SW

 

Description

A "SW" sensor measures slowly changing positive pore water pressure in oversaturated soils. A "XS" sensor, mounted to the SW sensor, is a thermistor necessary for temperature correction of the measured pressure. The Static Pore Water Pressure Gauge (SW) is a pore water pressure-sensing device consisting of a pressure sensitive diaphragm with a vibrating wire attached to it.

 

Manufacturer

Geokon 4500SL Vibrating Wire Piezometer.

 

Location and Quantity

SW/XS sensors were embedded into the base and subgrade layers near the centerline of both asphalt and PCC test cells. ii. There were originally 49 DW (and 49 XD) sensors located in 4 PCC, 6 hot-mix asphalt, and 1 aggregate surface MnROAD test cells.

 

Current Status

SW/XS sensors last reported data in November 2010.

 

MnROAD Database Table

Data has been collected automatically every 15 minutes over the life of each sensor. Data can be found in MnROAD database tables: MNR.SW_VALUES, MNR.XS_VALUES.