Residential Crack Response to Vibrations from Underground Mining

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This thesis summarizes two further developments of the Autonomous Crack Monitoring (ACM) system, which facilitates simultaneous measurement of crack response to environmental changes and various dynamic events. The first component was measurement of crack responses in three different materials and locations in a residential structure subjected to ground vibrations produced by an underground mine in Frankfort, Kentucky. These crack responses to blast vibrations were compared to responses to environmental changes as well as occupant activities. The second component was the design and qualification of a mounting system to measure for the first time crack response perpendicular to the wall (or surface) which contains the crack. These out-of-place crack responses were compared to traditional in-plane responses of a ceiling crack in a house adjacent to a surface quarry in Milwaukee, Wisconsin. Measurements in Kentucky indicate crack response is heavily dependant on material and location within the structure. The results also show that environmentally induced crack displacements can be 12 to 120 times greater than the largest blast induced crack displacements. The out-of-plane crack responses to ground motions are similar to in-plane responses to ground motions; however, they are less than in-plane responses to environmental changes for this ceiling crack

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  • 08/14/2017
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