New Simple Method for Calculating Impact Force on Flexible Barrier Considering Partial Muddy Debris Flow Passing Through
Publication: Journal of Geotechnical and Geoenvironmental Engineering
Volume 145, Issue 9
Abstract
Flexible barriers trap large particles and boulders in debris flow but allow slurry and small particles to pass through. Field tests and real cases indicate that a certain amount of slurry and small particles in debris flow passes through a flexible barrier with residual velocities. In the design of flexible barriers for debris flow mitigation, accurate determination of the impact force is the key issue. Nevertheless, a few of the current simple methods have quantified the effect of passing through on the impact force reduction. Without considering the passing through of slurry, impact loading can be tremendously overestimated. In this study, a new simple method considering the passing through of slurry is proposed based on a two-phase flow model. This method is verified by the measured impact forces of two large-scale physical modeling tests. In the tests, debris flows with different water contents in mass (89.4% and 61.1%) were initiated to affect a flexible barrier. The volume of the retained debris and the velocity loss of the passing slurry in the two tests were measured. Furthermore, this proposed simple method is validated by the data from well-documented laboratory tests in the literature. Comparisons and validations lead to the conclusion that the proposed simple method provides an accurate and creative way to predict the dynamic impact force of muddy debris flow on a flexible barrier.
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Acknowledgments
The work in this paper is supported by a CRF project (Grant No. PolyU 12/CRF/13E) from the Research Grants Council (RGC) of the Hong Kong Special Administrative Region Government (HKSARG) of China and two GRF projects (PolyU 152196/14E; PolyU 152796/16E) from the Research Grants Council (RGC) of the Hong Kong Special Administrative Region Government (HKSARG) of China. The authors also acknowledge financial support from the Research Institute for Sustainable Urban Development of Hong Kong Polytechnic University and grants (1-ZVCR, 1-ZVEH, 4-BCAU, 4-BCAW, 5-ZDAF, G-YN97) from Hong Kong Polytechnic University.
References
Armanini, A. 1997. “On the dynamic impact of debris flows.” In Recent developments on debris flows. Berlin: Springer.
Ashwood, W., and O. Hungr. 2016. “Estimating total resisting force in flexible barrier impacted by a granular avalanche using physical and numerical modeling.” Can. Geotech. J. 53 (10): 1700–1717. https://doi.org/10.1139/cgj-2015-0481.
Bagnold, R. A. 1954. “Experiments on a gravity-free dispersion of large solid spheres in a Newtonian fluid under shear.” Proc. R. Soc. Lond. A 225 (1160): 49–63. https://doi.org/10.1098/rspa.1954.0186.
Bugnion, L., B. W. McArdell, P. Bartelt, and C. Wendeler. 2012. “Measurements of hillslope debris flow impact pressure on obstacles.” Landslides 9 (2): 179–187. https://doi.org/10.1007/s10346-011-0294-4.
Canelli, L., A. M. Ferrero, M. Migliazza, and A. Segalini. 2012. “Debris flow risk mitigation by the means of rigid and flexible barriers-experimental tests and impact analysis.” Nat. Hazard. Earth Syst. Sci. 12: 1693–1699. https://doi.org/10.5194/nhess-12-1693-2012.
Chen, C. L. 1988. “Generalized viscoplastic modelling of debris flow.” J. Hydraul. Res. 114 (3): 237–258. https://doi.org/10.1061/(ASCE)0733-9429(1988)114:3(237).
Cui, P., C. Zeng, and Y. Lei. 2015. “Experimental analysis on the impact force of viscous debris flow.” Earth Surf. Processes Landform 40 (12): 1644–1655. https://doi.org/10.1002/esp.3744.
Cui, Y. F., C. E. Choi, H. Liu, and C. W. W. Ng. 2018. “Effects of particle size of monodispersed granular flows impacting a rigid barrier.” Nat. Hazard. 91 (3): 1179–1201. https://doi.org/10.1007/s11069-018-3185-3.
DeNatale, J. S., R. M. Iverson, J. J. Major, R. G. LaHusen, G. L. Fiegel, and J. D. Duffy. 1999. Experimental testing of flexible barriers for containment of debris flows.Washington, DC: USGS.
Geobrugg, A. G. 2012. “Geobrugg: Protection systems for rockfall, debris flow, slope instability, mining, avalanche.” Accessed January 10, 2019. https://www.youtube.com/watch?v=LUUeBRZ-lOg.
Hübl, J., J. Suda, D. Proske, R. Kaitna, and C. Scheidl. 2009. “Debris flow impact estimation.” In Proc., 11th Int. Symp. on Water Management and Hydraulic Engineering, 1–5. London: Taylor & Francis.
Hungr, O., G. C. Morgan, and R. Kellerhals. 1984. “Quantitative analysis of debris torrent hazards for design of remedial measures.” Can. Geotech. J. 21 (4): 663–677. https://doi.org/10.1139/t84-073.
Iverson, R. M. 1997. “The physics of debris flows.” Rev. Geophys. 35 (3): 245–296. https://doi.org/10.1029/97RG00426.
Iverson, R. M., and R. P. Denlinger. 2001. “Flow of variably fluidized granular masses across three-dimensional terrain. 1: Coulomb mixture theory.” J. Geophys. Res.-Solid Earth 106 (B1): 537–552. https://doi.org/10.1029/2000JB900329.
King, J. P. 2013. Tsing Shan debris flow and debris flood. Kowloon, Hong Kong: Geotechnical Engineering Office, HKSAR.
Kwan, J. S. H., S. L. Chan, J. C. Cheuk, and R. C. H. Koo. 2014. “A case study on an open hillside landslide impacting on a flexible rockfall barrier at Jordan Valley, Hong Kong.” Landslides 11 (6): 1037–1050. https://doi.org/10.1007/s10346-013-0461-x.
Kwan, J. S. H., and R. W. M. Cheung. 2012. Suggestion on design approaches for flexible debris resisting barriers. Kowloon, Hong Kong: Geotechnical Engineering Office, HKSAR.
Li, X., and J. Zhao. 2018. “A unified CFD-DEM approach for modeling of debris flow impacts on flexible barriers.” Int. J. Numer. Anal. Methods Geomech. 42 (14): 1643–1670. https://doi.org/10.1002/nag.2806.
Lichtenhan, C. 1973. “Die Berechnung von Sperren in Beton und Eisenbeton, Kolloquium on Torrent Dams ODC 384.3.” [In German.] In Proc., Mitteilungen der Forstlichen Bundes-Versuchsanstalt, 91–127. Wien: Mitteilungender Forstlichen Bundensanstalt.
Lo, D. O. K. 2000. Review of natural terrain landslide debris-resisting barrier design. Kowloon, Hong Kong: Geotechnical Engineering Office, HKSAR.
Ng, C. W. W., D. Song, C. E. Choi, L. H. D. Liu, J. S. H. Kwan, R. C. H. Koo, and W. K. Pun. 2016. “Impact mechanisms of granular and viscous flows on rigid and flexible barriers.” Can. Geotech. J. 54 (2): 188–206.
O’brien, J. S., P. Y. Julien, and W. T. Fullerton. 1993. “Two-dimensional water flood and mudflow simulation.” J. Hydraul. Eng. 119 (2): 244–261. https://doi.org/10.1061/(ASCE)0733-9429(1993)119:2(244).
Pudasaini, S. P., Y. Wang, and K. Hutter. 2005. “Modelling debris flows down general channels.” Nat. Hazard. Earth Syst. Sci. 5 (6): 799–819. https://doi.org/10.5194/nhess-5-799-2005.
Scotten, P., and F. Trivellato. 1995. “Dynamic pressure on check-dam due to debris-flow collision.” In Proc., 20th Australian Fluid Mechanics Conf., 187–190. Sydney, Australia: Univ. of Sydney.
Song, D., C. E. Choi, C. W. W. Ng, and G. G. D. Zhou. 2018. “Geophysical flows impacting a flexible barrier: Effects of solid-fluid interaction.” Landslides 15 (1): 99–110. https://doi.org/10.1007/s10346-017-0856-1.
Thakur, A. K. 1991. “Model: Mechanistic vs empirical.” In New trends in pharmacokinetics. Boston: Springer.
Tiberghien, D., D. Laigle, M. Naaim, E. Thibert, and F. Ousset. 2007. “Experimental investigations of interaction between mudflow and an obstacle.” In Proc., 4th Int. Conf. on Debris-Flow Hazards Mitigation: Mechanics, Prediction, and Assessment, 281–292. Rotterdam: Millpress.
Vagnon, F., and A. Segalini. 2016. “Debris flow impact estimation on a rigid barrier.” Nat. Hazard. Earth Syst. Sci. 16 (7): 1691–1697. https://doi.org/10.5194/nhess-16-1691-2016.
Volkwein, A. 2014. Flexible debris flow barriers. Design and application (WSL Berichte. Issue 18, 29). Birmensdorf: Swiss Federal Institute for Forest, Snow and Landscape Research WSL.
Volkwein, A., A. Roth, W. Gerber, and A. Vogel. 2009. “Flexible rockfall barriers subjected to extreme loads.” Struct. Eng. Int. 19 (3): 327–332. https://doi.org/10.2749/101686609788957900.
Volkwein, A., C. Wendeler, and G. Guasti. 2011. “Design of flexible debris flow barriers.” In Proc., 5th Int. Conf. Debris-Flow Hazard Mitigation. Mechanics, Prediction and Assessment, 1093–1100. Padua, Italy.
Wendeler, C. 2016. Debris-flow protection systems for mountain torrents. Basic principles for planning and calculation of flexible barriers. Birmensdorf: Swiss Federal Institute for Forest, Snow and Landscape Research WSL.
Wendeler, C., and A. Volkwein. 2015. “Laboratory tests for the optimization of mesh size for flexible debris-flow barriers.” Nat. Hazard. Earth Syst. Sci. 15: 2597–2604. https://doi.org/10.5194/nhess-15-2597-2015.
Wendeler, C., A. Volkwein, B. W. McArdell, and P. Bartelt. 2019. “Load model for designing flexible steel barriers for debris flow mitigation.” Can. Geotech. J. 56 (6): 893–910. https://doi.org/10.1139/cgj-2016-0157.
Wendeler, C., A. Volkwein, A. Roth, M. Denk, and S. Wartmann. 2007. “Field measurements and numerical modelling of flexible debris flow barriers.” In Proc., Debris-Flow Hazards Mitigation: Mechanics, Prediction, and Assessment, 681–687. Rotterdam, Netherlands: Millpress.
Zanuttigh, B., and A. Lamberti. 2006. “Experimental analysis of the impact of dry avalanches on structures and implication for debris flows.” J Hydraul. Res. 44 (4): 522–534. https://doi.org/10.1080/00221686.2006.9521703.
Zhao, H., L. Yao, Y. You, B. Wang, and C. Zhang. 2018. “Experimental study of the debris flow slurry impact and distribution.” Shock Vib. 2018. https://doi.org/10.1155/2018/5460362.
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©2019 American Society of Civil Engineers.
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Received: Sep 24, 2018
Accepted: Apr 25, 2019
Published online: Jul 4, 2019
Published in print: Sep 1, 2019
Discussion open until: Dec 4, 2019
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