Gatineau sits on a mix of Champlain Sea clay, glacial till, and fractured bedrock, with water tables fluctuating up to 2 m after spring thaw. That clay — sensitive and prone to settlement under load — makes geotechnical excavation monitoring a non-negotiable step before any deep cut. We install inclinometers and piezometers on site before mobilization, tracking lateral movement and pore pressure daily. For projects with tight tolerances, we combine this with capacity of load testing to verify bearing layers and slope stability analysis to catch rotational failure early. The data flows to a cloud dashboard accessible to the engineer and contractor 24/7.
Inclinometer readings every 1 m, pore pressure updates every 15 minutes — we catch movement before it becomes a claim.
Scope of work in Gatineau
- Automated total stations for surface settlement (±1 mm accuracy)
- In-place inclinometers at 1 m intervals for lateral movement
- Manual verification with geotechnical excavation monitoring data loggers every shift
Demonstration video
Typical technical challenges in Gatineau
The biggest risk in Gatineau’s clay is undrained shear failure during excavation — the soil loses strength fast if loading exceeds 70 % of its peak. We deploy a warning system with three tiers: green (normal), amber (5 mm lateral shift in 8 hours), and red (10 mm shift or pore pressure rise >20 %). When amber triggers, we pull back excavation rates and add temporary shoring. The equipment package includes vibrating-wire piezometers, ShapeAccelArray probes, and automated total stations, all cross-checked daily against manual readings. No single instrument drives the call — it’s the pattern across the array that counts.
Our services
We offer three integrated monitoring services tailored to Gatineau excavation projects:
Real-Time Inclinometer Arrays
ShapeAccelArray probes at 1 m spacing with automated data logging to a cloud platform. Alerts sent via SMS and email when lateral movement exceeds amber threshold. Calibration traceable to ASTM D6230-21.
Pore Pressure Monitoring
Vibrating-wire piezometers installed at multiple depths, with 0.1 kPa resolution. Continuous pore pressure tracking during excavation and backfill. Data integrated with the same cloud dashboard as inclinometer readings.
Surface Settlement Control
Automated total stations with ±1 mm accuracy, monitoring up to 50 points per site. Prism targets on adjacent structures and excavation edges. Weekly reports with trend analysis and comparison to predicted settlement curves.
Frequently asked questions
What does geotechnical excavation monitoring in Gatineau typically cost?
For a standard monitoring package with inclinometers, piezometers, and surface settlement control, the range is CA$1,310 to CA$3,630 depending on duration and number of instruments. Long-term projects (6+ months) or sites with difficult access may fall higher. Contact us for a project-specific quote.
When is excavation monitoring required by code in Gatineau?
Under NBCC 2020 and the Quebec Construction Code, any excavation deeper than 3 m in sensitive clay (common in Gatineau) requires instrumentation. The local municipality may also mandate monitoring for cuts near existing structures or utilities. We can help assess applicability for your site.
How fast can you deploy monitoring equipment after mobilization?
We can have inclinometers and piezometers installed and logging within 48 hours of site access. ShapeAccelArray probes are pre-calibrated in our lab, so field installation is quick — typically one day for a 10-probe array. Surface settlement targets can be set up simultaneously.
What red flags should I look for in monitoring data during excavation?
Watch for lateral movement exceeding 5 mm in 8 hours (amber threshold) or 10 mm in any 24-hour period, a pore pressure rise above 20% of initial reading, or settlement rates accelerating beyond 2 mm/day. Any of these warrants slowing excavation and adding shoring. Our dashboard flags these automatically.