Effective Monitoring of Pore Pressures and Soil Permeability with the BAT®-Groundwater Monitoring System
Pore pressures have a strong influence on soil behaviour, where even small changes can have considerable consequences, especially in soils with low permeability. With the BAT®-Groundwater monitoring system, you can frequently and reliably monitor the pore pressure, particularly in low permeable soils.
The BAT-system enables both a direct read-out of pore pressures as well as the option to accurately track fluctuations in the pore pressure remotely. With an additional permeability set, the BAT-system offers the extra possibility to determine the permeability of the soil and/or to collect accurate groundwater samples.
The patented BAT–Groundwater Monitoring System represents an innovative and proven technology for groundwater monitoring and testing. For over 30 years the BAT-system has been successfully used in a great number of groundwater monitoring projects worldwide.
Key advantages
- The system responds immediately to settlements, since no liquid flows between the sensors
- Intelligent Sensor Technology with data in engineering units (mm)
- Sensors are selected for each project with the appropriate measurement range
- The sensor automatically compensates for temperature
- Easy to transport
- No problems with condensation
- No electronics in high humidity environment
- Easy venting of air and fluid hoses
- Easy control of air bubbles in the system
“Effortlessly monitor and track pore pressure fluctuations in low permeability soils with the innovative and proven BAT®-Groundwater Monitoring System, trusted worldwide for over 30 years.”
Application
With the BAT®-system you:
- Accurately and efficiently measure the pore pressure
- Keep track of pressure fluctuations in the soil
- Monitor remotely or directly read-out the measurement data in engineering units
- Determine the permeability of the soil (with an additional set)
- Collect accurate groundwater samples (with an additional set)
References
- Monitoring of water pressure and settlements at the National Opera House in Oslo (Norway)
- Monitoring of water pressures during the relocation of the Kiruna mine. (Sweden)
- Monitoring of diaphragm wall at Central Station, North/South Line project, Amsterdam (Netherlands)
- Monitoring of groundwater levels and deformations, Ouderkerk aan den IJssel (Netherlands)
- Test campaign for the Oosterweel tunnel in Antwerp (Belgium)
Operation
The BAT-system consists of a filter tip and a sensor. It is easy to install the filter tip since the tip neither contains any sensitive elements, nor is connected to an electrical cable or tubing during installation. The filter tip is connected to an extension pipe, for example a standard one-inch gas pipe, and pushed down to the desired installation depth.
Next, the BAT-sensor is lowered down the pipe. As soon as the sensor connects with the filter tip, the pore pressure measurements will start. Due to the quick connection system, function control of both the BAT-sensor and the BAT-filter tip can be made at any time. After finishing the measurements, the sensor can be retrieved easily and used again at another site.
The BAT-sensor without BAT-filter tip can also be used in standpipes, which add extra flexibility to the system.
Depending on the project requirements, the BAT-system can be installed in different set-ups, such as single, clustered, and part of a large monitoring network.
Data handling
A single BAT-sensor can be equipped with a battery holder and can store measurement data for a period up to 8 months. Used as a single data logger in the field, the BAT-system is programmed with a robust hand-held IS-field unit to start measurements and later download the data.
You can integrate the BAT-system in a digital Profound IS-network, which allows remote monitoring of the project’s progress. One to ten BAT-sensors can be combined with an ISIS-module. This internet solar module is a fully digital unit offering the possibility to monitor remotely and/or directly in the field. With the ISIS-module, in combination with the IS-field unit, you can directly display a measurement in the field or set, log, and download measurements. The ISIS-module is a combined power supply, data logger, GPRS modem and provides a data backup.