He remained at the Technical University of Graz as a research assistant in the field of hydraulic engineering until 1945. From 1946 to 1952, he worked as a design engineer and site manager on power plant construction sites. During this period he had his first encounters with rock mechanics and tunneling. In 1952 he went to work for
Leopold Müller’s firm, the Engineering Office for Geotechnics and Tunnel Construction. In 1957 he became Müller’s partner, and in 1966 he became sole manager of the business. During their years together, Pacher and Müller made major advances in rock engineering and helped usher in the era of modern tunneling in the mid-1960s. In the years prior to 1975, his collaboration with Professor
Ladislaus von Rabcewicz was crucial to the development of tunneling construction and design. In 1983, Franz Pacher converted his rock mechanics and tunneling firm into the Ingenieurgemeinschaft für Geotechnik und Tunnelbau (IGT), or Engineering Group for Geotechnics and Tunneling Construction. He finally retired in 1988.
Projects Pacher worked on the
Schwaikheim Tunnel on the
Waiblingen-
Schwäbisch Hall-Hessental railway line, the first tunnel in Germany to be built according to the principles of
shotcrete construction. He was also involved in the planning of the Munich and Vienna subways, and served as a consultant during their construction. Between 1968 and 1975, he worked on the Tauern Road Tunnel and the nearby Katschberg Tunnel in the state of
Salzburg. From 1981 to 1985, he was in charge of tunnel construction of the new German railway line between
Hannover and
Würzburg. This included work on the Landrücken Tunnel. He was also involved in such projects as the construction of the Hirzmannsperre power plant in
Styria, the Dürrach dam in
Tyrol, and the turbine plant for the textile works in
Reutte. While in the employ of Leopold Müller, Pacher also helped monitor the anchoring of the
Vajont dam.
Contributions Pacher was responsible for major advances in fundamental research, such as the definition of planar and volumetric proportions of discontinuities and the ground reaction curve. In a 1964 publication, he introduced the Pacher-Fenner curve, a method for prediction and graphical representation of the interaction between ground pressure and tunnel support loading. This led in turn to the development of the convergence-confinement method. In 2009 Pacher created a diagram showing the time-dependency of both ground pressure and deformation.
Teaching From 1966 to 1987, Pacher lectured on rock mechanics at the
Technical University of Munich. From 1979 to 1983, he was a lecturer in Applied
Rock mechanics at the
Vienna University of Technology.
Other professional activities From 1975 to 1987, Pacher headed the Working Committee on Tunneling at the Research Association for Transport and Roads. Pacher delivered many lectures and wrote numerous papers for professional journals. ==Memberships==