Engineering:ShapeAccelArray
ShapeAccelArray (SAA)[1] is a sensor that can be placed in a borehole[2] or embedded within a structure to monitor deformation. It consists of a continuum of segments containing triaxial, micro electro mechanical system (MEMS) accelerometers[3] Each segment has a known length. By sensing the gravity field at each segment, the bend angles between each segment can be calculated.[4] Using the calculated bend angles and known segment lengths, the shape of an SAA can be determined. SAA can be used to determine 3D shape when installed vertically and 2D shape when installed horizontally. 3D shape can be determined when SAA is installed up to 60 degrees from zenith.
SAA is typically installed in 1” (26 mm ID) PVC conduit which is grouted within a borehole. The flexibility of the SAA joints enables it to bend up to 90° and withstand large deformations.[5] Data can be sent wirelessly to a server for automated processing and to enable remote data analysis in real-time. Data can also be periodically downloaded using a PC for analysis. Millimeter level precision can be achieved using this sensor.[6]
See also
- Automatic deformation monitoring system
- Slope stability
References
- ↑ Abdoun & Bennett, "A New Wireless MEMS-based System for Real-Time Deformation Monitoring," Geotechnical News, March, 2008, pp. 36–40.
- ↑ Cloutier, C., Locat, J., Lord, P.-E., Couture, R., & Jaboyedoff, M. 2012. “Kinematic Considerations of the Gascons Rockslide, Quebec (Gaspesie), Canada”. In Landslide and Engineered Slopes: Protecting Society through Improved Understanding, Proceedings of the 11th International & 2nd North American Symposium on Landslides. Vol. 2. Banff, Alberta. June 3–8, 2012. pp.1265-1271.
- ↑ Dasenbrock, D.D., Levesque, C.L., & Danisch, L. 2012. “Long-term behavior monitoring using automated MEMS-based sensing arrays in an urban environment”. In Landslide and Engineered Slopes: Protecting Society through Improved Understanding, Proceedings of the 11th International & 2nd North American Symposium on Landslides. Vol. 2. Banff, Alberta. June 3–8, 2012. pp.1393-1398.
- ↑ Rollins, K., et al. 2009. “Monitoring Displacement vs. Depth in Lateral Pile Load Tests with Shape Accelerometer Arrays”, in Proceedings of the 17th International Conference on Soil Mechanics & Geotechnical Engineering, Vol. 3., Alexandria, Egypt, October 5–9. pp. 2016-2019.
- ↑ Dasenbrock, D. 2010. “Automated Landslide and Instrumentation Programs on US Route 2,” in Proceedings of the University of Minnesota 58th Annual Geotechnical Engineering Conference, St. Paul, 26 February 2010, pp. 165-185.
- ↑ Barendse, “Field Evaluation of a MEMS-Based, Real-Time Deformation Monitoring System,” Geotechnical Instrumentation News, Vol 26, No 1, pp. 41–44, March 2008.
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