The instruments are remotely controlled by monitoring
software taking preprogrammed cyclical measurements
with millimeter precision. Data analysis can identify
long-and short-term trends as well as producing real-
time results as the TBM passes under each segment of
the tunnel corridor.
Fugro developed its own monitoring software,
GeoRiskPortal®, which has been successfully used
on a variety of projects worldwide. The software
connects to many types of monitoring instruments,
including strain gauges and extensometers. For this
project, the company wanted to include Trimble
total stations for the automated monitoring. Fugro
used the Trimble Precision software development kit
(TPSDK) to integrate the Trimble total stations with
GeoRiskPortal. The TPSDK enables software control of
the instruments, allowing developers to combine the
high-precision total stations with their own custom
software and instrumentation.
Monitoring robotic total stations were mounted on solid posts in secure enclosures along the route. These self-contained monitoring units
have robotic total stations, communications radios/-modems, rain/snow hoods, and sometimes cameras. They operate as a connected
network of instruments and common inter-visible monitoring/control points.
Right: In the port areas above the tunnel
route, arrays of monitoring prisms are
measured by robotic total stations on an
ongoing basis.
Left: To monitor the "soft" areas of the
tunnel corridor, iron rods with prisms
were driven into the open fields/parks in
dense arrays.
