An Attempt to Predict the Failure Time of Abandoned Mine Pillars |
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Authors: | R Castellanza E Gerolymatou R Nova |
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Institution: | (1) Research Assistant, Department of Structural Engineering, Milan University of Technology (Politecnico), Milan, Italy;(2) Visiting Research Assistant, Department of Structural Engineering, Milan University of Technology (Politecnico), Milan, Italy;(3) Professor, Department of Structural Engineering, Milan University of Technology (Politecnico), Milan, Italy |
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Abstract: | Summary Left in place pillars of abandoned mines are subject to weathering (e.g action of water, bacteria) that degrades their mechanical
strength and eventually leads to collapse. A simple weathering model is proposed, that is governed by two parameters: the
rate of progression of weathered front and the rate of degradation of the compressive strength with time. Both plane strain
and axisymmetric analyses are performed and closed form solutions of the variation with time of the bearing capacity of the
pillar are given. Experimental data of the tests conducted on gypsum and anhydrite specimens attacked by water are presented.
It is shown that in order to fit the experimental data a third parameter must be introduced. New closed form solutions are
given and the data are used for estimating the time to failure of abandoned gypsum mines in Northern Italy.
Authors’ address: Dr. Riccardo Castellanza, Research Assistant, Department of Structural Engineering, Milan University of
Technology (Politecnico), Piazza Leonardo da Vinci 32, 20133 Milan, Italy |
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Keywords: | : Anhydrite gypsum mine pillar weathering |
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