Geotechnical Instrumentation
Installation of various geotechnical instruments for data collection and monitoring
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The Challenge
- Expanding transit network
- Protect adjacent structures during construction
The Edmonton Light Rail system has 18 stations on two lines and is one of the busiest light rail transit systems in North America, with over 110,000 daily weekday riders. The Valley Line LRT SE project extends the current system to southeast Edmonton and includes the construction of a quarter mile tunnel and a new bridge over the North Saskatchewan River.
The Solution
Geocomp was subcontracted to provide geotechnical instrumentation and monitoring support services during construction of the rail tunnel, northern bridge abutment general on-site cut & fill activities. Services included:
- Instrumentation of ShapeAccelArray (SAA) automated inclinometers
- Measuring tilt due to soil movement during excavation
- Multi-point bore-hole extensometers (MPBX) to measure soil settlement during excavation
- Vibration monitors to monitor and protect adjacent structures during active construction.
- Piezometers measuring pore pressure levels during construction and automated tilt meters measuring building movement/tilt
Automated readings from instruments in the field were uploaded to Geocomp’s iSiteCentral® platform in real-time allowing for reduced time requirements from field staff and significant cost savings for the client. Geocomp’s field staff also helped the client install manual survey points to measure soil, building and tunnel movement related to construction where automated monitoring was not feasible. iSiteCentral® then integrated with the contractor’s manual survey points and tunnel convergence points to provide a comprehensive view of both the manual and automated monitoring of the tunnel stability, allowing the client a full picture of project performance.
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