Structural Evaluation of Masonry Sewer Pipes Under Transverse Settlement Due to Tunneling
The intention of this research is to perform structural evaluation on masonry sanitary sewer pipes impacted by tunnel excavation. Until about 1900, it was common to use several layers of brick to construct municipal sanitary sewer lines, and currently thousands of miles of brick sewer lines are still in service. The construction of new underground facilities inevitably disturbs the soil above and will have an impact on the existing masonry sanitary sewer pipes within the zone of influence of the excavation. Masonry pipes are typically susceptible to the longitudinal interaction failure mechanism at the hogging zone of the settlement trough due to their low tensile capacity. In this research standard egg-shaped section for brick sewer were subjected to ground settlements obtained using Attewell method. The greenfield condition is assumed to be applicable with homogeneous ground conditions. The impact of the depth to the tunnel axis and trough width parameter on the settlement trough and associated strains developed in the pipes are subjected to investigation. Tensile strain developed due to axial strain and bending moment are calculated for five different section sizes. Mitigation measures and recommendations are provided
Y. Wang, Q. Wang, and K. Y. Zhang, “An analytical model for pipe-soil-tunneling interaction,” Procedia Eng., vol. 14, pp. 3127–3135, 2011.
A. Klar, A. M. Marshall, K. Soga, and R. J. Mair, “Tunneling effects on jointed pipelines,” Can. Geotech. J., vol. 45, no. 1, pp. 131–139, 2008.
L. Metcalf and H. Prescott Eddy, American Sewerage Practice: Construction of sewers, 1st ed. .
J. N. Franzius, “Behaviour of buildings due to tunnel induced subsidence A,” Imperial College of Science, Technology and Medicine, 2003.
A. M. Marshall, “Tunnelling in sand and its effect on pipelines and piles,” Univ. Cambridge, no. March, 2009.
P. F. Silva, P. Heydarpour, and R. Burgueño, “Stability Index Evaluation of Slender RC Bridge Columns under Seismic and Gravity Loads,” J. Bridg. Eng., vol. 24, no. 5, p. 04019029, 2019.
E. Leca, B. New, and G. Reporter, “Settlements induced by tunneling in Soft Ground,” Tunn. Undergr. Sp. Technol., vol. 22, no. 2, pp. 119–149, 2007.
T. E. . Vorster, “The Effects of Tunneling on Buried Pipes,” 2005.
M. S. J. Committee, Building Code Requirements and Specification for Masonry Structures. 2013 Building Code Requirements and Specification for Masonry Structures – MSJC, 2013.
ASCE/SEI 7 Minimum Design Loads For Buildings and Other Structures. Structural Engineering Institute, 2016.
P. B. Attewell and J. P. Woodman, “Predicting the dynamic of ground settlement and its derivatives caused by tunnelling in soil,” Gr. Eng., vol. 15, no. 7, pp. 13–22, 1982.
R. B. Peck, “Deep Excavations and Tunnelling in Soft Ground,” in 7th International Conference on Soil Mechanics and Foundation Engineering, 1969, pp. 266–290.
E. J. Cording and W. . Hansmire, “Displacement around soft ground tunnels,” in 5th Pan American Conf. on Soil Mech. & Foundation Eng., 1975, pp. 571–633.
M. P. O’Reilly and B. M. New, “Settlements above Tunnels in the United Kingdom - Their Magnitude and Prediction,” Tunnelling, pp. 173–181, 1982.