A ventilation shaft in Germany is part of a former colliery and was put into operation in the late 19th century with a depth of approx. 600 m. Since the colliery was closed down, it has been part of the central water drainage system at the site, together with further shafts in the near distance. In the course of technical reconstruction measures, the shaft is to be converted from a ventilation shaft to a well shaft. For this purpose, the current diameter has to be expanded to a clearance of 3.3 m. The shaft, which was previously constructed with approx. 50 cm thick brick masonry, will be secured with a concrete shell after expansion. To evaluate the predimensioning of the shell, a numerical modeling of the secondary stress field is necessary.
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Dr. Ghazvinian specializes in geomechanics of brittle rocks. He offers expertise in continuum and discontinuum modeling of underground excavations prone to brittle fracturing and spalling. He has experience in application of numerical models to sequencing life of mine simulations and predicting potential seismic hazards in deep underground excavations.
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