Prof. Georgios Anagnostou's Lecture on Face Stability

50th Lecture day of the 2nd Level Specializing Masters in Tunnelling course and the Last day of  ITACET Training Seminar (28th March '14)  was presented by Prof. Georgios Anagnostou from ETH Zurich, Switzerland. Prof. Anagnostou's lecture was focused on Tunnel face instability in soil and the potential hazards related to it. Professor explained the idealized failure mechanism (wedge in front of face + prismatic body extending upto the surface based on Horm 1961) of face instability using model tests and the derivation of limit equilibrium equations for calculation of support pressure. 

Prof. Anagnostou's Lecture on Face Stability

Professor also gave examples of face stability calculation using Limit Equilibrium equations and based on monograms.

Examples of Support Face Pressure Calculation using LEM Approach

References:

[1] J. Messerli, E. Pimentel, and G. Anagnostou, “Experimental study into tunnel face collapse in sand,” Phys. Model. Geotech., vol. 1, pp. 575–580, 2010.

[2] G. Anagnostou and K. Serafeimidis, “The dimensioning of tunnel face reinforcement,” in World Tunnel Congress 2007, May.

[3] R. Schuerch and G. Anagnostou, “Analysis of the stand-up time of the tunnel face,” in World Tunnel Conference 2013 Geneva, 2013, pp. 709–714.

[4] G. Anagnostou, “Urban tunnelling in water bearing ground – Common problems and soil-mechanical analysis methods,” in 2nd International Conference on Soil Structure Interacton in Urban Civil Engineering, 2002, pp. 233–240.

[5] K. Serafeimidis, M. Ramoni, and G. Anagnostou, “Analysing the stability of reinforced tunnel faces,” in 14th European Conference on Soil Mechanics and Geotechnical Engineering, 2007, pp. 1079–1084.

[6] G. Anagnostou, “Some remarks concerning EPB and slurry shields,” in Development of Urban Areas and Geotechnical Engineering, 2008.

[7] G. Anagnostou and K. Kovari, “Face stability in slurry and EPB shield tunnelling,” in Geotechnical Aspects of Underground Construction in Soft Ground, 1996, pp. 453–458.

[8] P. Perazzelli and G. Anagnostou, “Comparing the limit equilibrium method and the numerical stress analysis method of tunnel face stability assessment,” 7th Int. Symp. „Geotechnical Asp. Undergr. Constr. Soft Gr. “. Rome, 2011.

[9] G. Anagnostou and K. Kovári, “The face stability of slurry-shield-driven tunnels,” Tunn. Undergr. Sp. Technol., vol. 9, no. 2, pp. 165–174, Apr. 1994.

[10] G. Anagnostou and K. Kovári, “Face stability conditions with earth-pressure-balanced shields,” Tunn. Undergr. Sp. Technol., vol. 11, no. 2, pp. 165–173, Apr. 1996.

[11] L. Cantieni and G. Anagnostou, “The interaction between yielding supports and squeezing ground,” Tunn. Undergr. Sp. Technol., vol. 24, no. 3, pp. 309–322, May 2009.

[12] G. Anagnostou and L. Cantieni, “Design and analysis of yielding support in squeezing ground,” in 11th ISRM Congress, 2007, p. 4.