مدلسازی فیزیکی دیوار خاک مسلح ژئوسنتتیکی بعنوان کوله‌ی پل‌

حسینی, سیدمحمدحسین; نورزاد, علی; زمانیان, مصطفی

doi:10.22065/jsce.2020.226452.2118

مدلسازی فیزیکی دیوار خاک مسلح ژئوسنتتیکی بعنوان کوله‌ی پل‌

نوع مقاله : علمی - پژوهشی

نویسندگان

¹ گروه مهندسی ژئوتکنیک / دانشکده مهندسی عمران، آب و محیط زیست/ دانشگاه شهید بهشتی/ تهران / ایران

² دانشکده مهندسی عمران، آب و محیط زیست پردیس شهیدعباسپور دانشگاه شهید بهشتی

³ استادیار گروه عمران دانشگاه شهید بهشتی تهران

10.22065/jsce.2020.226452.2118

چکیده

دیوارهای خاک مسلح ژئوسنتتیکی (GRS) می‌توانند به عنوان یک جایگزین مناسب برای کوله‌ی پل‌های یکپارچه مورد استفاده قرار گیرند که علاوه بر مزایای اقتصادی، تاثیر زیادی بر کاهش نشست‌های نامتقارن بین عرشه و خاک اطراف دارند. با توجه به اهمیت پل‌ها به عنوان یکی از عناصر شریان حیاتی، بررسی رفتار این سازه‌ها تحت بارگذاری استاتیکی و دینامیکی از اهمیت ویژه‌ای برخوردار است. به همین منظور یکسری مدل فیزیکی برای بررسی رفتار پی پل‌های واقع بر دیوار خاک مسلح، مورد آزمایش قرار گرفت. در این تحقیق تاثیر فاصلة پی از لبه‌ی دیوار بر مقادیر تنش و تغییر شکل دیوار مورد ارزیابی قرار گرفته است. مدل فیزیکی ساخته شده دارای مقیاس 1 به 5 بود. برای شبیه سازی اجزای دیوار از بلوک‌های بتنی به ابعاد 50×50×45 میلیمتر برای رویه آن، چهار لایه ژئوسنتتیک به عنوان المان‌های مسلح کننده و ماسه D11 فیروزکوه برای مصالح پرکننده، استفاده شد. بارگذاری استاتیکی بر روی پی نواری با عرض 75 میلیمتر و در فواصل مختلفی از لبه دیوار اعمال شد. نتایج نشان داد که مد غالب گسیختگی دیوار عمیقاً تحت تاثیر محل قرارگیری پی از رویه دیوار است. با نزدیک شدن پی به لبه دیوار، خرابی از نوع گسیختگی موضعی است و با افزایش فاصله از لبه‌ی دیوار، نشست فونداسیون، عامل کنترل کننده ظرفیت باربری پی خواهد بود. نتایج نشان داد که بعد از فاصله‌ی بحرانی 2B (دو برابر عرض پی نواری) از لبه‌ی دیوار می‌توان انتظار داشت که با تامین ظرفیت باربری پی، عملکرد پل دچار اختلال نشود.

کلیدواژه‌ها

موضوعات

مهندسی ژئوتکینک

عنوان مقاله [English]

Physical modelling of geosynthetic reinforced earth wall as a bridge abutment

نویسندگان [English]

seyed mohammad hussein husseini ¹
Ali Noorzad ²
mostafa zamanian ³

² sbu, tehran, iran

³ sbum tehran, iran

چکیده [English]

Geosynthetic Reinforced Soil (GRS) walls could be used as appropriate substitutes for abutment of integrated bridges, for they not only offer financial advantages but also have an enormous impact on reducing asymmetric settlement between the deck and the surrounding soil. Since the bridges constitute a key element of the lifelines, investigating monotonic and cyclic behavior of these structures is of particular importance. To this aim, a series of physical models of the abutment were tested in order to investigate the behavior of bridge footings on GRS walls. In this study, the effect of footing distance from the wall facing on the stress and deformations of the wall has been investigated. The walls were constructed with a scale factor of 1 to 5. The wall elements were simulated using cubic concrete blocks of 50×50×45mm for facing, four geosynthetic layers as reinforcing elements, and Firoozkouh D11 sand as filling material. Monotonic loading was imposed on a strip footing with a width of 75 mm located at different distances from the facing. Results showed that the distance of footing from the wall facing strongly influence GRS failure mode. The failure mode was local failure of the wall facing for near face footing, whereas enormous footing settlement was controlling factor for the load bearing capacity of the far footing. Results indicated that, if the critical distance (2B) from the wall facing is observed and the bearing capacity of the footing is provided, a proper bridge performance could be expected.

کلیدواژه‌ها [English]

Geosynthetic Reinforced Soil Wall
Physical Model
Abutment
Failure Mode
Bearing Capacity

مراجع

[1] R.J. Lock, Integral Bridge Abutments, 2002.

[2] M.C. M Brown, Abutment : An Overview, in: 2014: pp. 4203–4212.

[3] M.T. Adams, W. Schlatter, T. Stabile, Geosynthetic reinforced soil integrated abutments at the bowman road bridge in Defiance County, Ohio, Geotech. Spec. Publ. (2007) 12. https://doi.org/10.1061/40909(228)12.

[4] M. Adams, J. Nicks, T. Stabile, J. Wu, W. Schlatter, J. Hartmann, Geosynthetic Reinforced Soil Integrated Bridge System, Synthesis Report, (2011) 64. https://www.fhwa.dot.gov/publications/research/infrastructure/structures/11027/11027.pdf.

[5] N. Abu-Hejleh, T. Wang, J.G. Zornberg, Performance of geosynthetic-reinforced walls supporting bridge and approaching roadway structures, in: Proc. Sess. Geo-Denver 2000 - Adv. Transp. Geoenvironmental Syst. Using Geosynth. GSP 103, 2000: pp. 218–243. https://doi.org/10.1061/40515(291)15.

[6] S.H. Mirmoradi, M. Ehrlich, Evaluation of the effect of toe restraint on GRS walls, Transp. Geotech. 8 (2016) 35–44. https://doi.org/10.1016/j.trgeo.2016.03.002.

[7] M. Ehrlich, S.H. Mirmoradi, R.P. Saramago, Evaluation of the effect of compaction on the behavior of geosynthetic-reinforced soil walls, Geotext. Geomembranes. 34 (2012) 108–115. https://doi.org/10.1016/j.geotexmem.2012.05.005.

[8] Y. Zheng, P.J. Fox, J.S. McCartney, Numerical study on maximum reinforcement tensile forces in geosynthetic reinforced soil bridge abutments, Geotext. Geomembranes. 46 (2018) 634–645. https://doi.org/10.1016/j.geotexmem.2018.04.007.

[9] O. Rahmouni, A. Mabrouki, M. Mellas, Numerical study of geogrid-reinforced segmental earth retaining wall, J. Appl. Eng. Sci. Technol. 1 (2015) 43-49–49.

[10] S.M.B. Helwany, G. Reardon, J.T.H. Wu, Effects of backfill on the performance of GRS retaining walls, Geotext. Geomembranes. 17 (1999) 1–16. https://doi.org/10.1016/S0266-1144(98)00021-1.

[11] B. Hatami, Kianoosh, PARAMETRIC ANALYSIS OF REINFORCED SOIL WALLS WITH DIFFERENT BACKFILL MATERIAL PROPERTIES Kianoosh Hatami School of Civil Engineering and Environmental Science Richard J . Bathurst GeoEngineering Centre at Queen ’ s-RMC Royal Military College of Canada , K, (2005) 14–16.

[12] S.M.B. Helwany, J.T.H. Wu, A. Kitsabunnarat, Simulating the behavior of GRS bridge abutments, J. Geotech. Geoenvironmental Eng. 133 (2007) 1229–1240. https://doi.org/10.1061/(ASCE)1090-0241(2007)133:10(1229).

[13] S.H. Mirmoradi, M. Ehrlich, Experimental evaluation of the effects of surcharge width and location on geosynthetic-reinforced soil walls, Int. J. Phys. Model. Geotech. 19 (2019) 27–36. https://doi.org/10.1680/jphmg.16.00074.

[14] C. Xiao, J. Han, Z. Zhang, Experimental study on performance of geosynthetic-reinforced soil model walls on rigid foundations subjected to static footing loading, Geotext. Geomembranes. 44 (2016) 81–94. https://doi.org/10.1016/j.geotexmem.2015.06.001.

[15] Y. Zheng, P.J. Fox, Numerical investigation of the geosynthetic reinforced soil-integrated bridge system under static loading, J. Geotech. Geoenvironmental Eng. 143 (2017) 1–14. https://doi.org/10.1061/(ASCE)GT.1943-5606.0001665.

[16] Y. Zheng, P.J. Fox, Numerical investigation of geosynthetic-reinforced soil bridge abutments under static loading, J. Geotech. Geoenvironmental Eng. 142 (2016) 1–13. https://doi.org/10.1061/(ASCE)GT.1943-5606.0001452.

[17] M. Abu-Farsakh, A. Ardah, G. Voyiadjis, Numerical Investigation of the Performance of a Geosynthetic Reinforced Soil-Integrated Bridge System (GRS-IBS) under Working Stress Conditions, Geotech. Spec. Publ. 2018-March (2018) 76–87. https://doi.org/10.1061/9780784481608.008.

[18] M.Y. Abu-Farsakh, A. Ardah, G.Z. Voyiadjis, Numerical parametric study to evaluate the performance of a Geosynthetic Reinforced Soil–Integrated Bridge System (GRS-IBS) under service loading, Transp. Geotech. 20 (2019). https://doi.org/10.1016/j.trgeo.2019.04.001.

[19] H. Ahmadi, A. Bezuijen, Full-scale mechanically stabilized earth (MSE) walls under strip footing load, Geotext. Geomembranes. 46 (2018) 297–311. https://doi.org/10.1016/j.geotexmem.2017.12.002.

[20] Y. Zheng, A.M. Asce, P.J. Fox, F. Asce, P.B. Shing, M. Asce, J.S. Mccartney, F. Asce, Physical Model Tests of Half-Scale Geosynthetic Reinforced Soil Bridge Abutments . I : Static Loading, 145 (2019) 1–14. https://doi.org/10.1061/(ASCE)GT.1943-5606.0002152.

[21] Standard Test Method for Particle-Size Analysis of Soils, 2007. https://doi.org/10.1520/D0422-63R07E01.2.

[22] Standard Test Methods for Maximum Index Density and Unit Weight of Soils Using a, 2006. https://doi.org/10.1520/D4253-00R06.

[23] Standard Test Method for Determining Tensile Properties of Geogrids by the Single or, 2010. https://doi.org/10.1520/D6637-10.2.

[24] J. Nicks, M. Adams, P.S.. Ooi, T. Stabile, Geosynthetic Reinforced Soil Performance Testing — Axial Load Deformation Relationships, Fed. High W. Adm. (2013).

[25] R.J. Bathurst, Challenges and recent progress in the analysis, design and modelling of geosynthetic reinforced soil walls, 10th Int. Conf. Geosynth. ICG 2014. (2014).

[26] J.E. Nicks, D. Esmaili, M.T. Adams, Geotextiles and Geomembranes Deformations of geosynthetic reinforced soil under bridge service loads, Geotext. Geomembranes. 44 (2016) 641–653. https://doi.org/10.1016/j.geotexmem.2016.03.005.