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Tunnel Support & Anchor Monitoring with Load Cells

Real‑Time Load Monitoring to Ensure Tunnel Stability
A civil engineering firm wanted to better understand load behaviour within tunnel support systems. To achieve this, they implemented real-time monitoring of the forces acting on tunnel linings and support systems (rock bolts, tiebacks, etc.). Traditionally, capturing these load changes is challenging and often relies on periodic manual checks that can miss sudden or critical events. Using high-precision load cells is key to improving monitoring reliability and efficiency. ANYLOAD’s 363HSAN is well suited to this demanding geotechnical application, providing accurate data to support safer construction and long-term tunnel stability.

Challenge

  1. Harsh Environment: Tunnel environments are humid, which makes it difficult for standard load cells to maintain long-term zero-point stability.
  2. Eccentric Loading: The non-uniform nature of rock masses results in off-centre loading, requiring load cells with a high tolerance for eccentric forces.
  3. Limited Access: This project required deep excavation and tunnel support in complex soil layers. Once installed, accessing or replacing these sensors is
    extremely difficult, time‑consuming, and costly, making long‑term reliability a
    critical requirement

Solution

  1. Weatherproof Design: A welded seal provides superior resistance to water and moisture, ensuring reliable operation in the humid tunnel environment.
  2. Eccentric Load Compensation: The 363HSAN design compensates for potential eccentric forces during installation, ensuring precise and reliable measurements.
  3. Enhanced Durability: The 363HSAN offers excellent long-term stability, making it ideal for long-term monitoring.
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Conclusion

The implemented monitoring system delivered continuous, real-time load data from critical tunnel support elements. This enabled construction teams to identify rising loads early and issue warnings before design limits were reached. The project successfully prevented structural deformation risks, optimized reinforcement strategies, and improved overall construction safety. ANYLOAD’s 363HSAN sensors continued to provide stable long-term data, forming a valuable structural health record for ongoing tunnel operation and maintenance.
363HSAN-Tunnel-WEB
363HSAN-Load-Cell-WEB

Keywords: Geotechnical Monitoring, Tunnel Stability, Structural Health Monitoring, Foundation Anchor, Vibrating Wire Load Cells

Featured Products

363HSAN
Compression Load Cell
See standard version.

The ANYLOAD 363HSAN Compression Load Cell is a heavy-duty through-hole compression load cell designed for high-capacity force measurement where a structural element must pass through the sensor body. Its annular design allows bolts, threaded rods, anchor cables, or shafts to pass through the center of the load cell while compressive force is transferred through the surrounding bearing surface. Manufactured from stainless steel with a fully welded IP68 seal, the 363HSAN is engineered for reliable long-term performance in demanding environments including outdoor construction sites, industrial facilities, and structural monitoring installations. The model is available in a 60 t rated capacity, making it suitable for high-load measurement and monitoring applications.

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