MEMS-ARRAY MONITORING OF A DAM

摘要

The expansion of concrete caused by alkali-aggregate reaction (AAR) causes significant deformation at the Mactaquac Generating Station, Keswick Ridge, New Brunswick, Canada. Several technologies are used to monitor the deformation behaviour, among which are inverted pendulums. The inverted pendulums provide critical information regarding the overall tilt of the dam intake, powerhouse, and spillway gate structures. The expenses associated with installing pendulum technology and the relatively short life expectancy have led engineers to investigate the feasibility of using ShapeAccelArray (SAA) as a supplementary technology. The micromachined electromechanical system (MEMS) accelerometers used to measure tilt within SAAs are theoretically capable of precision approaching that of inverted pendulums. SAA offers the ability to monitor along a non-straight path, but installation to achieve precision similar to that of pendulums has been problematic. This paper describes early results from a 28-meter SAA near a diversion gate.