Examining the Performance of Geogrid- and Geocell-Reinforced Foundations Subjected to Normal Faulting

Document Type : Original Research

Authors
N. Ahmadi
M. fadaee
a Department of Civil Engineering, Science and Research Branch, Islamic Azad University, Tehran, Iran
DOI: 10.22034/22.2.14
Abstract
Abstract

Surface fault rupture is very dangerous for critical buildings and infrastructures located in or near active faults and can cause irreparable damages. These structures must be designed by considering the undesirable effects of surface faulting. In this case, geotechnical measures, especially the construction of reinforced earth foundations are very effective in reducing the adverse effects of surface faults. The ASTM designation primarily recommends avoiding constructions to the adjacent of active faults probable of causing rupture at ground surface during an earthquake, although it is hard to determine the exact location of surface faulting. The increasing growth of population and the need to develop cities, particularly in metropolitan areas with economic limitations or land restrictions, have attracted the attention of the engineering community more than before to carry out feasibility studies on the construction of buildings in active fault zones. Such a consideration does not negate that the primary recommendation to avoid construction of buildings over active fault zones is the most convenient solution; it rather aims at examining and making engineering arrangements for the construction of buildings in zones with surface faulting potential governable by engineering methods. In addition to buildings, linear projects such as roads, highways, and tunnels must cross regions probable of surface faulting. Therefore, geotechnical measures, particularly designing reinforced soil foundations, contribute significantly to the reduction of undesirable effects of surface faulting. This research is conducted based on a series of tests on foundations reinforced with geogrid, geocell, and a combination of both, subject to normal faulting, to reduce surface faulting ruptures. The tests simulate the behavior of a 1.5 m wide strip foundation, placed over 6 m thick alluvium, subjected to a displacement of 60 cm. Seven tests were performed by different types and numbers of reinforcement, which were scaled to 10. The image analysis was carried out to examine the ground settlement profile, angular distortion, and fault propagation path. The results showed that the geotextiles used in the reinforced soil foundation could effectively reduce the angular distortion, cause uniform settlement, and divert fault propagation path, all protecting the structure against faulting. In a foundation reinforced with one layer of geogrid, a uniform settlement occurred at fault-induced displacement. In particular, the geogrid largely affected fault distribution, angular distortion reduction, and uniform ground settlement. Also, the settlement occurred at a wider zone and reduced the angular distortion by 60%. It means that the geocell affected the reduction of angular distortion and creation of uniform settlement by about 30%; however, it did not affect faulting diversion. The results indicate that the foundation reinforced with a combination of geocell and geogrid reduces angular distortion by 70% acted almost the same as the foundation reinforced with one layer of geogrid. Due to the increased stiffness and compressive strength of geocell, the shear band was more diverted toward the left side, compared to the foundation reinforced with one layer of geogrid. The right boundary of the shear band was also moved to the left corner of the structure. Likewise, the foundation reinforced with a combination of two layers of geogrid and three layers of geogrid reduces angular distortion by 80%. The results also reveal that adding more than two layers of geogrid had no effect on angular distortion reduction and the fault propagation path was more diverted as the number of geogrid layers increased.

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1. Mosavi, S., Jafari, M., 2014 Physical modeling to reduce the risk of surface fault using geogrid, 8th National Congress of Civil Engineering-Babol (In Persian)
2. Faccioli, E., Anastasopoulos, I., Callerio, A. and Gazetas, G., 2008 Case histories of fault–foundation interaction. Bulletin of Earthquake Engineering, 6(4), pp.557-583.
3. Anastasopoulos, I. and Gazetas, G., 2007a Foundation–structure systems over a rupturing normal fault: Part I. Observations after the Kocaeli 1999 earthquake. Bulletin of Earthquake Engineering, 5(3), pp.253-275.
4. Yang, K.H., Chiang, J., Lai, C.W., Han, J. and Lin, M.L., 2020 Performance of geosynthetic-reinforced soil foundations across a normal fault. Geotextiles and Geomembranes, 48(3), pp.357-373.
5. Lin, A., Ren, Z., Jia, D. and Wu, X., 2009 Co-seismic thrusting rupture and slip distribution produced by the 2008 Mw 7.9 Wenchuan earthquake, China. Tectonophysics, 471(3-4), pp.203-215.
6. Yu, G., Xu, X., Klinger, Y., Diao, G., Chen, G., Feng, X., Li, C., Zhu, A., Yuan, R., Guo, T. and Sun, X., 2010 Fault-scarp features and cascading-rupture model for the M w 7.9 Wenchuan earthquake, eastern Tibetan plateau, China. Bulletin of the Seismological Society of America, 100(5B), pp.2590-2614.
7. Anastasopoulos, I., Gazetas, G., Bransby, M.F., Davies, M.C.R. and El Nahas, A., 2007 Fault rupture propagation through sand: finite-element analysis and validation through centrifuge experiments. Journal of Geotechnical andGeoenvironmental Engineering, 133(8), pp.943-958.
8. Bray, J.D., 2001, January. Developing mitigation measures for the hazards associated with earthquake surface fault rupture. In Workshop on seismic fault-induced failures—possible remedies for damage to urban facilities. University of Tokyo Press (pp. 55-79).
9. Lazarte, C.A., Bray, J.D., Johnson, A.M. and Lemmer, R.E., 1994 Surface breakage of the 1992 Landers earthquake and its effects on structures. Bulletin of the Seismological Society of America, 84(3), pp.547-561.
10. Bray, J.D., Ashmawy, A., Mukhopadhyay, G. and Gath, E.M., 1993 Use of geosynthetics to mitigate earthquake fault rupture propagation through compacted fill. In Proceedings of the Geosynthetics' 93 Conference (Vol. 1, pp. 379-392).
11. Argyrou, C., O’Rourke, T.D., Stewart, H.E. and Wham, B.P., 2019 Large-scale fault rupture tests on pipelines reinforced with cured-in-place linings. Journal of Geotechnical and Geoenvironmental Engineering, 145(3), p.04019004.
12. Garcia, F.E. and Bray, J.D., 2019a Discrete element analysis of earthquake fault rupture-soil-foundation interaction. Journal of Geotechnical and Geoenvironmental Engineering, 145(9), p.04019046.
13. Garcia, F.E. and Bray, J.D., 2019b Discrete-element analysis of influence of granular soil density on earthquake surface fault rupture interaction with rigid foundations. Journal of Geotechnical and Geoenvironmental Engineering, 145(11), p.04019093.
14. Ashtiani, M., Ghalandarzadeh, A., Mahdavi, M. and Hedayati, M., 2018 Centrifuge modeling of geotechnical mitigation measures for shallow foundations subjected to reverse faulting. Canadian Geotechnical Journal, 55(8), pp.1130-1143.
15. Loli, M., Kourkoulis, R. and Gazetas, G., 2018 Physical and numerical modeling of hybrid foundations to mitigate seismic fault rupture effects. Journal of Geotechnical and Geoenvironmental Engineering, 144(11), p.04018083.
16. Fadaee, M., Ezzatyazdi, P., Anastasopoulos, I. and Gazetas, G., 2016 Mitigation of reverse faulting deformation using a soil bentonite wall: Dimensional analysis, parametric study, design implications. Soil Dynamics and Earthquake Engineering, 89, pp.248-261.
17. Oettle, N.K. and Bray, J.D., 2013 Geotechnical mitigation strategies for earthquake surface fault rupture. Journal of Geotechnical and Geoenvironmental Engineering, 139(11), pp.1864-1874.
18. Anastasopoulos, I., Gazetas, G., Bransby, M.F., Davies, M.C. and El Nahas, A., 2009 Normal fault rupture interaction with strip foundations. Journal of Geotechnical and Geoenvironmental Engineering, 135(3), pp.359-370.
19. Anastasopoulos, I. and Gazetas, G., 2007b Foundation–structure systems over a rupturing normal fault: Part II. Analysis of the Kocaeli case histories. Bulletin of Earthquake Engineering, 5(3), pp.277-301.
20. Moosavi, S.M., Jafari, M.K., Kamalian M., and Shafiee, A. 2010 Experimental Investigation of Reverse Faul Rupture-Rigid Shallow Foundation Interaction, International Journal of Civil Engineering, 8(2), 85-98.
21. ULUSAY, R., AYDAN, Ö. and HAMADA, M., 2002 The behaviour of structures built on active fault zones: examples from the recent earthquakes of Turkey. Structural Engineering/Earthquake Engineering, 19(2), pp.149s-167s.
22. Lee, J.W. and Hamada, M., 2005 An experimental study on earthquake fault rupture propagation through a sandy soil deposit. Structural Engineering/Earthquake Engineering, 22(1), pp.1s-13s.
23. Bransby, M.F., Davies, M.C.R., El Nahas, A. and Nagaoka, S., 2008 Centrifuge modelling of reverse fault–foundation interaction. Bulletin of Earthquake Engineering, 6(4), pp.607-628.
24. Bransby, M.F., Davies, M.C.R. and Nahas, A.E., 2008 Centrifuge modelling of normal fault–foundation interaction. Bulletin of Earthquake Engineering, 6(4), pp.585-605.
25. Lade, P.V., Cole Jr, D.A. and Cummings, D., 1984 Multiple failure surfaces over dip-slip faults. Journal of Geotechnical Engineering, 110(5), pp.616-627.
26. Lin, M.L., Chung, C.F., Jeng, F.S. and Yao, T.C., 2007 The deformation of overburden soil induced by thrust faulting and its impact on underground tunnels. Engineering Geology, 92(3-4), pp.110-132.
27. Anastasopoulos, I., Gazetas, G., Drosos, V., Georgarakos, T. and Kourkoulis, R., 2008 Design of bridges against large tectonic deformation. Earthquake Engineering and Engineering Vibration, 7(4), pp.345-368.28. Anastasopoulos, I., Antonakos, G. and Gazetas, G., 2010 Slab foundation subjected to thrust faulting in dry sand: Parametric analysis and simplified design method. Soil Dynamics and Earthquake Engineering, 30(10), pp.912-924.
29. Paolucci, R. and Yilmaz, M.T., 2008 Simplified theoretical approaches to earthquake fault rupture–shallow foundation interaction. Bulletin of Earthquake Engineering, 6(4), pp.629-644.
30. Tolga Yilmaz, M. and Paolucci, R., 2007 Earthquake fault rupture—shallow foundation interaction in undrained soils: a simplified analytical approach. Earthquake engineering & structural dynamics, 36(1), pp.101-118.
31. Bray, J.D., 1990 The effects of tectonic movements on stresses and deformations in earth embankments (Doctoral dissertation, University of California, Berkeley).
32. Bransby, M.F., Davies, M.C.R., El Nahas, A. and Nagaoka, S., 2008 Centrifuge modelling of reverse fault–foundation interaction. Bulletin of Earthquake Engineering, 6(4), pp.607-628.
33. Ahmed, W. and Bransby, M.F., 2009 Interaction of shallow foundations with reverse faults. Journal of geotechnical and geoenvironmental engineering, 135(7), pp.914-924.
34. Ardah, A., Abu-Farsakh, M.Y. and Voyiadjis, G.Z., 2018 Numerical evaluation of the effect of differential settlement on the performance of GRS-IBS. Geosynthetics International, 25(4), pp.427-441.
35. Sadat, M.R., Huang, J., Bin-Shafique, S. and Rezaeimalek, S., 2018 Study of the behavior of mechanically stabilized earth (MSE) walls subjected to differential settlements. Geotextiles and Geomembranes, 46(1), pp.77-90.
36. Huang, C.C., 2017 Failure mechanisms of steep-faced geosynthetic-reinforced retaining walls subjected to toe scouring. Marine Georesources & Geotechnology, 35(8), pp.1099-1110.
37. Talebi, M., Meehan, C.L. and Leshchinsky, D., 2017 Applied bearing pressure beneath a reinforced soil foundation used in a geosynthetic reinforced soil integrated bridge system. Geotextiles and Geomembranes, 45(6), pp.580-591.
38. Chen, J.F., Tolooiyan, A., Xue, J.F. and Shi, Z.M., 2016 Performance of a geogrid reinforced soil wall on PVD drained multilayer soft soils. Geotextiles and Geomembranes, 44(3), pp.219-229.39. Kost, A.D., Filz, G.M., Cousins, T. and Brown, M.C., 2014 Full-Scale Investigation of Differential Settlements beneath a GRS Bridge Abutment: An Overview. In Geo-Congress 2014: Geo-characterization and Modeling for Sustainability (pp. 4203-4212).
40. King, L., Bouazza, A., Gaudin, C., O’Loughlin, C.D. and Bui, H.H., 2019 Behavior of geosynthetic-reinforced piled embankments with defective piles. Journal of Geotechnical and Geoenvironmental Engineering, 145(11), p.04019090.
41. Holz, R.D., Christopher, B.R. and Berg, R.R., 1998 Geosynthetic design and construction guidelines (No. FHWA HI-95-038).
42. Giroud, J.P., Bonaparte, R., Beech, J.F. and Gross, B.A., 1990 Design of soil layer-geosynthetic systems overlying voids. Geotextiles and Geomembranes, 9(1), pp.11-50.
43. GHALANDARZADEH, A. and ASHTIANI, M., 2017 Geotechnical mitigation measures for interaction of reverse faulting and shallow foundations: centrifuge modeling. In The 19th International Conference on Soil Mechanics and Geotechnical Engineering.
44. Moosavi, S.M. and Jafari, M.K., 2012 Investigation of the surface fault rupture hazard mitigation by geosynthetics. In Proceedings of the 15th World Conference on Earthquake Engineering, Lisbon, Portugal.
45. Ohta, H., Ishigaki, T. and Tatta, N., 2013 Retrofit technique for asphalt concrete pavements after seismic damage. In Proceedings of the 18th International Conference on Soil Mechanics and Geotechnical Engineering, Paris (pp. 1333-1336).
46. Chen, Y.G., Chen, W.S., Lee, J.C., Lee, Y.H., Lee, C.T., Chang, H.C. and Lo, C.H., 2001 Surface rupture of 1999 Chi-Chi earthquake yields insights on active tectonics of central Taiwan. Bulletin of the Seismological Society of America, 91(5), pp.977-985.
47. Viswanadham, B.V.S. and König, D., 2004 Studies on scaling and instrumentation of a geogrid. Geotextiles and Geomembranes, 22(5), pp.307-328.
48. Wood, D.M., 2017 Geotechnical modelling. CRC press.
49. Bray, J.D., Seed, R.B., Cluff, L.S. and Seed, H.B., 1994 Earthquake fault rupture propagation through soil. Journal of Geotechnical Engineering, 120(3), pp.543-561.
Modares Civil Engineering journal
Volume 22, Issue 2
May and June 2022
Pages 211-229