زمین شناسی مهندسی

زمین شناسی مهندسی

مطالعه آزمایشگاهی رفتار پی نواری بر شیب های مسلح شده با ژئوسل

نویسندگان
دانشگاه خوارزمی
چکیده
به منظور برآورد ظرفیت باربری پی­‌های نواری بر روی شیب‌­های مسلح شده با ژئوسل، تعدادی آزمایش بارگذاری صفحه انجام شده است. در همین راستا اثر مشخصاتی مانند طول لایه ژئوسل، تعداد و همچنین موقعیت قرارگیری آن‌­ها بر ظرفیت باربری شالوده نواری واقع بر مصالح دانه‌ای که در مجاورت شیب قرارگرفته باشد بررسی‌شده است. نتایج این مطالعه نشان می­‌دهد در حالتی که از یک لایه ژئوسل برای تسلیح استفاده شود عمق بهینه قرارگیری این لایه برابر با 0.1 عرض شالوده نواری است. همچنین افزایش طول مسلح کننده تا میزان 3 برابر عرض می­‌تواند ظرفیت باربری را افزایش دهد و افزایش طول مسلح کننده بیش از این مقدار تأثیر مثبت بیشتری در ظرفیت باربری ندارد و ممکن است باعث کاهش آن نیز شود. از سوی دیگر استفاده از دو لایه ژئوسل می­‌تواند باعث افزایش ظرفیت تا میزان 126 درصد نسبت به حالت غیرمسلح گردد. لازم به ذکر است که شرط این موضوع قرارگیری ژئوسل در فاصله مناسب نسبت به لایه اول است که در این مطالعه برابر با 0.2 عرض شالوده نواری پیشنهاد شده است. در نهایت، نتایج نشان می‌دهد که کارایی تقویت شیب با ژئوسل در کاهش فاصله بین شرایط شیب و صفحه با افزایش نشست پی افزایش می‌یابد که دلیل آن بسیج بیشتر زاویه اتساع مصالح دانه­‌ای شیب و محصور شدن جانبی بهتر سنگدانه‌ها در کرنش‌های بالاتر است.
کلیدواژه‌ها

Alamshahi, S., & Hataf, N. (2009). Bearing capacity of strip footings on sand slopes reinforced with geogrid and grid-anchor. Geotextiles and Geomembranes, 27(3), 217-226. https://doi.org/10.1016/j.geotexmem.2008.11.011
Ardakani, A., & Namaei, A. (2021). Numerical investigation of geocell reinforced slopes behavior by considering geocell geometry effect. Geomechanics and Engineering, 24(6), 589-597. https://doi.org/10.12989/gae.2021.24.6.589
ASTM D1556 (2007), Standard Test Method for Density and Unit Weight of Soil in Place by the Sand-cone Method.
ASTM D2487 (2011), Standard Practice for Classification of Soils for Engineering Purposes (Unified Soil Classification System), ASTM International, West Conshohocken, PA
Bathurst, R. J., Blatz, J. A., & Burger, M. H. (2003). Performance of instrumented large-scale unreinforced and reinforced embankments loaded by a strip footing to failure. Canadian Geotechnical Journal, 40(6), 1067-1083. https://doi.org/10.1139/t03-052
Castelli, F., & Motta, E. (2009). Bearing Capacity of Strip Footings Near Slopes. Geotechnical and Geological Engineering, 28(2), 187-198. https://doi.org/10.1007/s10706-009-9277-9
Chakraborty, D., & Kumar, J. (2013). Bearing capacity of foundations on slopes. Geomechanics and Geoengineering, 8(4), 274-285. https://doi.org/10.1080/17486025.2013.770172
Chen, R.-H., & Chiu, Y. (2008). Model tests of geocell retaining structures. Geotextiles and Geomembranes, 26(1), 56-70. https://doi.org/10.1016/j.geotexmem.2007.03.001
Chen, R.-H., Wu, C.-P., Huang, F.-C., & Shen, C.-W. (2013). Numerical analysis of geocell-reinforced retaining structures. Geotextiles and Geomembranes, 39, 51-62. https://doi.org/10.1016/j.geotexmem.2013.07.003
Chou NNS, Yang KH, Wu HM, Lin JJ, Ho SJ, & Liu CN. (2023). Case study of a reinforced soil slope with marginal backfill as a detention pond in flood control. Journal of GeoEngineering, 18(1), 033-047, http://dx.doi.org/10.6310/jog.202303_18(1).4
Dash, S. K. (2010). Influence of relative density of soil on performance of geocell-reinforced sand foundations. Journal of Materials in Civil Engineering, 22(5), 533-538. https://doi.org/10.1061/(ASCE)MT.1943-5533.0000040
Dash, S. K. (2012). Effect of geocell type on load-carrying mechanisms of geocell-reinforced sand foundations. International Journal of Geomechanics, 12(5), 537-548. https://doi.org/10.1061/(ASCE)GM.1943-5622.0000162
Dash, S. K., Krishnaswamy, N., & Rajagopal, K. (2001). Bearing capacity of strip footings supported on geocell-reinforced sand. Geotextiles and Geomembranes, 19(4), 235-256. https://doi.org/10.1016/S0266-1144(01)00006-1
Dash, S. K., Rajagopal, K., & Krishnaswamy, N. R. (2004). Performance of different geosynthetic reinforcement materials in sand foundations. Geosynthetics International, 11(1), 35-42. https://doi.org/10.1680/gein.2004.11.1.35
Dash, S. K., Rajagopal, K., & Krishnaswamy, N. R. (2007). Behavior of geocell-reinforced sand beds under strip loading. Canadian Geotechnical Journal, 44(7), 905-916. https://doi.org/10.1139/t07-035
Dash, S. K., Reddy, P. D. T., & Raghukanth, S. (2008). Subgrade modulus of geocell-reinforced sand foundations. Proceedings of the Institution of Civil Engineers-Ground Improvement, 161(2), 79-87. https://doi.org/10.1680/grim.2008.161.2.79
El Sawwaf, M. A. (2007). Behavior of strip footing on geogrid-reinforced sand over a soft clay slope. Geotextiles and Geomembranes, 25(1), 50-60. https://doi.org/10.1016/j.geotexmem.2006.06.001
Fahliani, H. K., Arvin, M. R., Hataf, N., & Khademhosseini, A. (2021). Experimental Model Studies on Strip Footings Resting on Geocell-Reinforced Sand Slopes. International Journal of Geosynthetics and Ground Engineering, 7(2), 1-15. https://doi.org/10.1007/s40891-021-00270-1
Halder, K., & Chakraborty, D. (2018). Bearing Capacity of Strip Footing Placed on the Reinforced Soil Slope. International Journal of Geomechanics, 18(11), 06018025. https://doi.org/10.1061/(ASCE)GM.1943-5622.0001278
Halder, K., & Chakraborty, D. (2020). Probabilistic bearing capacity of strip footing on reinforced anisotropic soil slope. Geomechanics and Engineering, 23(1), 15-30. https://doi.org/10.12989/gae.2020.23.1.015
Isik, A., & Gurbuz, A. (2020). Pullout behavior of geocell reinforcement in cohesionless soils. Geotextiles and Geomembranes, 48(1), 71-81. https://doi.org/10.1016/j.geotexmem.2019.103506
Javankhoshdel, S., & Bathurst, R. J. (2015). Influence of cross correlation between soil parameters on probability of failure of simple cohesive and c-ϕ slopes. Canadian Geotechnical Journal, 53(5), 839-853. https://doi.org/10.1080/17486025.2013.770172
Kakrasul, J. I., Han, J., & Rahmaninezhad, S. M. (2020). Load-Deformation Behavior of Geosynthetic-Reinforced Retaining Walls with Limited Fill Space Under Static Footing Loading. Transportation Infrastructure Geotechnology, 7(3), 309-331. https://doi.org/10.1007/s40515-020-00132-9
Keskin, M. S., & Laman, M. (2014). Experimental study of bearing capacity of strip footing on sand slope reinforced with tire chips. Geomechanics & engineering, 6(3), 249-262. https://doi.org/10.12989/gae.2014.6.3.249
Khorsandiardebili, N., & Ghazavi, M. (2021). Static stability analysis of geocell-reinforced slopes. Geotextiles and Geomembranes, 49(3), 852-863. https://doi.org/10.1016/j.geotexmem.2020.12.012
Langhaar, J.L., )1951(. Dimensional Analysis And Theory of Models. Wiley, New York, NY, USA.
Liu CN, Lin BH, Huang WW, & Ho YH. (2021). Finite element analyses of geosynthetic-reinforced soil ground under surcharge and probabilistic estimation of the bearing capacity. Journal of GeoEngineering, 16(3), 099-109. http://dx.doi.org/10.6310/jog.202109_16(3).3
Madhavi Latha, G., & Rajagopal, K. (2007). Parametric finite element analyses of geocell-supported embankments. Canadian Geotechnical Journal, 44(8), 917-927. https://doi.org/10.1139/T07-039
Madhavi Latha, G., Dash, S. K., & Rajagopal, K. (2008). Equivalent continuum simulations of geocell reinforced sand beds supporting strip footings. Geotechnical and Geological Engineering, 26(4), 387-398. https://doi.org/10.1007/s10706-008-9176-5
Manju, G.S., & Madhavi Latha, G. )2013(. Interfacial friction properties of Geocell reinforced sand. International Journal of Innovative Research in Science, Engineering and Technology 2 (1), 25–31.
Mehdipour, I., Ghazavi, M., & Ziaie Moayed, R. (2017). Stability analysis of geocell-reinforced slopes using the limit equilibrium horizontal slice method. International Journal of Geomechanics, 17(9), 06017007. https://doi.org/10.1061/(ASCE)GM.1943-5622.0000935
Moghaddas Tafreshi, S.N., & Dawson, A. R. (2010a). Behaviour of footings on reinforced sand subjected to repeated loading–Comparing use of 3D and planar geotextile. Geotextiles and Geomembranes, 28(5), 434-447. https://doi.org/10.1016/j.geotexmem.2009.12.007
Moghaddas Tafreshi, S.N., & Dawson, A. R. (2010b). Comparison of bearing capacity of a strip footing on a sand with geocell and with planar forms of geotextile reinforcement. Geotextiles and Geomembranes, 28(1), 72-84. https://doi.org/10.1016/j.geotexmem.2009.09.003
Moghaddas Tafreshi, S.N., Khalaj, O., & Dawson, A. (2013). Pilot-scale load tests of a combined multilayered geocell and rubber-reinforced foundation. Geosynthetics International, 20(3), 143-161. https://doi.org/10.1680/gein.13.00008
Moradi, G., Abdolmaleki, A., & Soltani, P. (2019). Small-and large-scale analysis of bearing capacity and load-settlement behavior of rock-soil slopes reinforced with geogrid-box method. Geomechanics and Engineering, 18(3), 315-328. https://doi.org/10.12989/gae.2019.18.3.315
Nazari, R.A., Ghanbari, A. & Sharafi, H. (2025). An Earthquake-Induced Reinforced Slope Sliding Displacement Estimation Model Using a Probabilistic Procedure. Transp. Infrastruct. Geotech. 12, 72. https://doi.org/10.1007/s40515-024-00490-8
Neto, J. A. (2019). Application of the two-layer system theory to calculate the settlements and vertical stress propagation in soil reinforcement with geocell. Geotextiles and Geomembranes, 47(1), 32-41. https://doi.org/10.1016/j.geotexmem.2018.09.003
Neto, J.A., Bueno, B., & Futai, M. (2013). A bearing capacity calculation method for soil reinforced with a geocell. Geosynthetics International, 20(3), 129-142. https://doi.org/10.1680/gein.13.00007
Sireesh, S., Sitharam, T.G., & Dash, S.K., (2009). Bearing capacity of circular footing on geocell–sand mattress overlying clay bed with void. Geotextiles and Geomembranes. 27 (2), 89–98. https://doi.org/10.1016/j.geotexmem.2008.09.005
Song, F., Liu, H., Ma, L., & Hu, H. (2018). Numerical analysis of geocell-reinforced retaining wall failure modes. Geotextiles and Geomembranes, 46(3), 284-296. https://doi.org/10.1016/j.geotexmem.2018.01.004
Tabatabai Aghda, S. T., Ghanbari, A., & Tavakoli Mehrjardi, Gh. (2019). Evaluating the Applicability of Geocell-Reinforced Dredged Sand Using Plate and Wheel Load Testing. Transportation Infrastructure Geotechnology, 6(1), 21-38. https://doi.org/10.1007/s40515-018-00067-2
Tavakoli Mehrjardi, G. T., & Motarjemi, F. (2018). Interfacial properties of geocell- reinforced granular soils. Geotextiles and Geomembranes, 46(4), 384-395. https://doi.org/10.1016/j.geotexmem.2018.03.002
Tavakoli Mehrjardi, Gh., Behrad, R., & Tafreshi, S. M. (2019). Scale effect on the behavior of geocell-reinforced soil. Geotextiles and Geomembranes, 47(2), 154-163. https://doi.org/10.1016/j.geotexmem.2018.12.003
Tavakoli Mehrjardi, Gh., Ghanbari, A., & Mehdizadeh, H. (2016). Experimental study on the behaviour of geogrid-reinforced slopes with respect to aggregate size. Geotextiles and Geomembranes, 44(6), 862-871. https://doi.org/10.1016/j.geotexmem.2016.06.006
Yoon, Y. W., Heo, S. B., & Kim, K. S. (2008). Geotechnical performance of waste tires for soil reinforcement from chamber tests. Geotextiles and Geomembranes, 26(1), 100-107. https://doi.org/10.1016/j.geotexmem.2006.10.004