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Landslide triggered by small excavation – numerical simulations
DOI:
https://doi.org/10.24425/ace.2023.147660Abstract
The main objective of this work is to present the results of numerical simulations of the landslide triggered by small excavation. In south-eastern Poland in 2019, during excavation for a gas pipeline (relatively small – maximal depth 2.7 m), a landslide was observed. Length of the landslide was about 80 m, width about 50 m, maximal depth 6.5 m. Excavation was partially buried. Observed cracks of the terrain surface were wide, up to 0.8 m. Stability of the landslide was analyzed using the proportional reduction of the soil strength parameters (c-fi reduction) algorithm with the use of ZSoil.PC Finite Element Method (FEM) system. Stability analysis of the slope before and after excavation was performed, together with analysis of the tendency of the landslide to propagate upwards. The obtained stability loss modes were compared with the results of the field observations and a good correlation was noticed. Hypothesis that a landslide was triggered by small excavation was proved (although reasonable margin of safety was obtained for state before excavation, stability factor SF = 1.60). Use of residual soil strength parameters (instead of peak ones) and activation of cut-off (no tension) condition are advised. Presented methodology is open and can be used in engineering practice.References
[1] D.H. Cornforth, Landslides in Practice. John Wiley & Sons, Inc., 2005.
[2] L. Wysokiński, “The methods of landslides prediction and their protection”, in XXV Scientific Conference “Building failures”. 2011, pp. 291-320.
[3] D. Sarah and M. R. Daryono, “Engineering geological investigation of slow moving landslide in Jahiyang Village, Salawu, Tasikmalaya Regency”, Indonesian Journal of Geology, vol. 7, no. 1, pp. 27-38, 2012.
[4] G. Tang, J. Huang, D. Sheng, and S. W. Sloan, “Stability analysis of unsaturated soil slopes under random rainfall patterns”, Engineering Geology, vol. 245, pp. 322-332, 2018, doi: 10.1016/j.enggeo.2018.09.013.
[5] J. Kogut and E. Pilecka, “Application of the terrestrial laser scanner in the monitoring of earth structures”, Open Geosciences, vol. 12, no. 1, pp. 503-517, 2020, doi: 10.1515/geo-2020-0033.
[6] J. Kogut, E. Pilecka, and D. Szwarkowski, “Analysis of landslide effects along a road located in the Carpathian flysch”, Open Geosciences, vol. 10, no.1, pp. 517-531, 2018, doi: 10.1515/geo-2018-0041.
[7] A. Ozbay and F. Cabalar, “FEM and LEM stability analyses of the fatal landslides at Çöllolar open-cast lignite mine in Elbistan, Turkey”, Landslides, vol. 12, pp. 155-163, 2015, doi: 10.1007/s10346-014-0537-2.
[8] B. Pasierb, M. Grodecki, and R. Gwóźdź, “Geophysical and geotechnical approach to a landslide stability assessment: a case study”, Acta Geophisica, vol. 67, no. 6, pp. 1823-1834 2019, doi: 10.1007/s11600-019-00338-7.
[9] E. Pilecka, J. Zięba, and D. Szwarkowski, “Analysis of the behaviour of the high and steep slope of a road made through waste under the influence of rainfall”, Archives of Civil Engineering, vol. 67, no. 2, pp. 293-307, 2021, doi: 10.24425/ace.2021.137169.
[10] A. Truty, A. Urbański, M. Grodecki, and K. Podleś, “Computer aided models of landslides and their protection problems”, Scientific-Technical Papers of Communication Engineers and Technicians of the Republic of Poland in Cracow, vol. 88, pp. 395-419, 2009.
[11] Y. Zheng, X. Tang, S. Zhao, C. Deng, and W. Lei, “Strength reduction and step-loading finite element approaches in geotechnical engineering”, Journal of Rock Mechanics and Geotechnical Engineering, vol. 1, no. 1, pp. 21-30, 2009, doi: 10.3724/SP.J.1235.2009.00021.
[12] S.E. Cho, “Stability analysis of unsaturated soil slopes considering water-air flow caused by rainfall infiltration”, Engineering Geology, vol. 211, pp. 184-197, 2016, doi: 10.1016/j.enggeo.2016.07.008.
[13] J-S. Xu and X-L. Yang, “Three-dimensional stability analysis of slope in unsaturated soils considering strength nonlinearity under water drawdown”, Engineering Geology, vol. 237, pp. 102-115, 2018, doi: 10.1016/ j.enggeo.2018.02.010.
[14] D.V. Griffiths and P.A. Lane, “Slope stability analysis by finite elements”, Geotechnique, vol. 49, no. 3, pp. 387-403, 1999, doi: 10.1680/geot.1999.49.3.387.
[15] T. Matsui and K-C. San, “Finite element slope stability analysis by shear strength reduction technique”, Soils and Foundations, vol. 32, no. 1, pp. 59-70, 1992, doi: 10.3208/sandf1972.32.59.
[16] M. Berti, L. Bertello, A. R. Bernadi, and G. Caputo, “Back analysis of a large lanslide in a flysh rock mass”, Landslides, vol. 14, pp. 2041-2058, 2017, doi: 10.1007/s10346-017-0852-5.
[17] A. Urbański and M. Grodecki, “Protection of a building against landslide. A case study and FEM simulations”, Bulletin of the Polish Academy of Sciences. Technical Sciences, vol. 67, no. 3, pp. 657-664, 2019, doi: 10.24425/bpasts.2019.128545.
[18] A. Urbański and M. Grodecki, “Piles system securing road against landslide. 2D/3D method of numerical modeling and design problems”, Bulletin of the Polish Academy of Sciences. Technical Sciences, vol. 68, no. 6, pp. 1433-1442, 2020, doi: 10.24425/bpasts.2020.135378.
[19] Z. Bestyński, E. Sieinski, and P. Śliwiński, “Geophysical investigation and the use of their results in the evaluation of the stability of slopes of artificial water reservoirs in the flysch Carpathians”, Archives of Civil Engineering, vol. 68, no. 3, pp. 71-85, 2022, doi: 10.24425/ace.2022.141874.
[20] J.B. Peng, Z. Fan, D. Wu, Q.B. Huang, Q.Y. Wang, J. Q. Zhuang, and W.Y. Che, “Landslides triggered by excavation in the loess plateau of China: A case study of Middle Pleistocene loess slopes”, Journal of Asian Earth Sciences, vol. 171, pp. 246-258, 2019, doi: 10.1016/j.jseaes.2018.11.014.
[21] J.J. Wang, Y. Liang, H.P. Zhang, Y. Wu, and X. Lin, “A loess landslide induced by excavation and rainfall”, Landslides, vol. 11, pp. 141-152, 2014, doi: 10.1007/s10346-013-0418-0.
[22] Z.J. Fan, P.H.S.W. Kulatilake, J.B. Peng, W.Y. Che, Y.Z. Li, and Z.J. Meng, “In-flight excavation of a loess slope in a centrifuge model test”, Geotechnical and Geological Engineering, vol. 34, no. 5, pp. 1577-1591, 2016, doi: 10.1007/s10706-016-0067-x.
[23] S. Commend, S. KIvell, R.F. Obrzud, K. Podleś, A. Truty, and T. Zimmermann, Computational geomechanics & applications with ZSOIL.PC. Lauzanne, Switzerland: Rosolis Editions & Zace Services, 2022.
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