Safety and environmental issues in rock engineering : proceedings/comptes-rendus/sitzungsberichte/ISRM International Symposium, EUROCK '93, Lisbon, 21-24 June 1993.: proceedings/comptes-rendus/sitzungsberichte/ISRM International Symposium, EUROCK '93, Lisbon, 21-24 June 1993. Volume 2 (2022)