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<正>Chair for Rock Mechanics and Director of Geotechnical Institute of TU Bergakademie Freiberg&Senior Consultant,Itasca,Germany E-mail:heinz.konietzky@ifgt.tu-freiberg.deProfessor Heinz Konietzky is a graduate(Dipl.-Ing.1987;Dr.-Ing.1989;Dr.-Ing