اثر کیفیت شیمیایی مایعات منفذی مختلف بر ارتباط مکش با پتانسیل تورمی یک خاک متورم-شونده

مهندسی عمران فردوسی

مقاله 1، دوره 35، شماره 2 - شماره پیاپی 38، شهریور 1401، صفحه 1-18  

نوع مقاله: مقاله پژوهشی

شناسه دیجیتال (DOI): 10.22067/jfcei.2022.71939.1053

نویسندگان

سهراب خضریان¹؛ علی رییسی استبرق ²؛ محدثه امینی²؛ جمال عبدالهی³

¹گروه آبیاری و آبادانی، دانشکده مهندسی و فناوری، دانشگاه تهران

²گروه آبیاری و آبادانی، دانشکده مهندسی و فناوری، دانشگاه تهران.

³دانشکده مهندسی و فناوری، دانشگاه تهران.

چکیده

در این کار تحقیقاتی، ارتباط مکش­ ماتریک با پتانسیل تورمی و فشار تورمی یک خاک متورم­شونده تهیه‌شده با مایعات منفذی مختلف (آب مقطر، سدیم­کلرید و کلسیم­کلرید) با انجام آزمایش­های لازم، مورد مطالعه قرار گرفت. نمونه­هایی از خاک متورم­شونده که حاوی مایع منفذی آب مقطر و محلول­های سدیم­کلرید و کلسیم­کلرید با غلظت g/l  250 بودند، به­روش تراکم استاتیکی تهیه شدند و منحنی مشخصه آب و خاک با استفاده از روش فیلتر کاغذی برای هر یک از آن‌ها تعیین شد. با انجام آزمایش­های مربوط، میزان تورم آزاد و فشار تورمی در رطوبت­های مختلف برای هر نمونه به­دست آمد. هم‌چنین با استفاده از منحنی مشخصه هر نمونه برای هر رطوبت، مکش معادل آن به­دست آمد. سپس منحنی تغییرات مقادیر تورم و فشار تورمی با مکش تعیین گردید. نتایج نشان داد که کیفیت­های گوناگون مایع منفذی سبب ایجاد منحنی­های مشخصه آب و خاک مختلف می­گردد. از طرفی مقایسه نتایج مشخص نمود که در هر مکش مشخص، پتانسیل تورمی و فشار تورمی نمونه­های با مایع منفذی سدیم­کلرید بیشتر از سایر مایعات منفذی می­باشد. علاوه بر این نتایج SEM نشان داد که ساختار خاک برای مایعات منفذی مختلف یکسان نمی­باشد و برای یک مایع منفذی مشخص نیز، ساختار خاک در ابتدا و انتهای آزمایش متفاوت است. 

کلیدواژه‌ها

خاک متورم‌شونده؛ تورم آزاد؛ منحنی مشخصه؛ سدیم‌کلرید و کلسیم‌کلرید

مراجع

1. Jones, D.E. and Jones, K.A., "Treating expansive soils", Civil Engineering—ASCE, Vol. 57, No. 8, pp. 62-65, (1987).
2. Puppala, A.J. and Cerato, A., "Heave distress problems in chemically-treated sulfate-laden materials", Geo-Strata, Vol. 10, No. 2, pp. 28-32, (2009).
3. Driscoll, R. and Crilly, M., "Subsidence damage to domestic buildings. Lessons learned and questions remaining", BRE Press, London, (2000).
4. Richards, B. G., "Footings for small and domestic structures", Linn Education and Training Services, Brisbane, Australia, (1990).
5. McManus, K. J., Lopes, D. and Osman, N. Y., "The effect of Thornthwaite Moisture Index Changes in ground movement predictions in Australian soils. To the ENZ of the Earth", Proceedings of the 9th Australia New Zealand Conference on Geomechanics, Centre for Continuing Education, The University of Auckland, Auckland, New Zealand, pp. 675-680, (2004).
6. Chen, Y.G., Zhu, C.M., Ye, W.M., Cui, Y.J. and Chen, B., "Effects of solution concentration and vertical stress on the swelling behavior of compacted GMZ01 bentonite", Applied Clay Science, Vol. (124-125), pp. 11-20, (2016).
7. Al-Yaqoub, T.H., Parol, J. and Znidarcic, D., "Experimental investigation of volume change behavior of swelling soil", Applied Clay Science, Vol. 137, pp. 22-29, (2017).
8. Siddiqua, S., Blatz, J. and Siemens, G., "Evaluation of the impact of pore fluid chemistry on the hydromechanical behaviour of clay–based sealing materials", Canadian Geotechnical Journal, Vol. 48, No. 2, pp. 199–213, (2011).
9. Castellanos, E., Villar, M.V., Romero, E., Lloret, A. and Gens, A., "Chemical impact on the hydro-mechanical behaviour of high-density FEBEX bentonite", Physics and Chemistry of the Earth, Parts A/B/C, Vol. 33, Suppl. 1, pp. S516-S526, (2008).
10. Estabragh, A.R., Moghadas, M. and Javadi, A.A., "Effect of different types of wetting fluids on the behaviour of expansive soil during wetting and drying", Soils and Foundations, Vol. 53, No. 5, pp. 617-627, (2013).
11. Pusch, R., "Experimental study of the effect of high porewater salinity on the physical properties of a natural smectite clay", Technical Report No. TR01–07 (35 p.), Swedish Nuclear Fuel and Waste Management Co., Stockholm, Sweden, (2001).
12. Di Maio, C., Santoli, L. and Schiavone, P., "Volume change behaviour of clays: The influence of mineral composition, pore fluid composition and stress", Mechanics of Materials, Vol. 36, No. (5–6), pp. 435–451, (2004).
13. Rao, S. M. and Shivananda, P., "Role of osmotic suction in swelling of salt–amended clays", Canadian Geotechnical Journal, Vol. 42, No. 1, pp. 307–315, (2005).
14. Laird, D.A., "Influence of layer charge on swelling of smectites", Applied clay science, Vol. 34, No. (1-4), pp. 74-87, (2006).
15. Zhang, F., Ye, W. M., Wang, Q., Chen, Y. G. and Chen, B., "An insight into the swelling pressure of GMZ01 bentonite with consideration of salt solution effects", Engineering Geology, Vol. 251, pp. 190–196, (2019).
16. Cui, Y.J., Nguyen, X.P., Tang, A.M. and Li, X.L., "An insight into the unloading/reloading loops on the compression curve of natural stiff clays", Applied Clay Science. Vol. (83-84), pp. 343-348, (2013).
17. He, Y., Ye, W.M., Chen, Y.G., Zhang, K.N. and Wu, D.Y., "Effects of NaCl solution on the swelling and shrinkage behavior of compacted bentonite under one-dimensional conditions", Bulletin of Engineering Geology and the Environment, Vol. 79, No.1, pp. 399–410, (2019).
18. Liang, W.Y., Yan, R.T., Xu, Y.F., Zhang, Q., Tian, H.H. and Wei, C.F., "Swelling pressure of compacted expansive soil over a wide suction range", Applied Clay Science, Vol. 203, pp. 106018, (2021).
19. Sun, H., Scaringi, G., Mašín, D. and Najser, J., "An experimental investigation on the swelling behavior of compacted B75 bentonite", Engineering Geology, Vol. 296, pp. 106452, (2022).
20. Ferber, V., Auriol, J.C., Cui, Y.J. and Magnan, J.P., "On the swelling potential of compacted high plasticity clays", Engineering Geology, Vol. 104, No. (3-4), pp. 200-210, (2009).
21. McKeen, R.G., "A model for predicting expansive soil behavior", In Proceedings of the 7th International Conference on Expansive Soils, Dallas, Tex. pp. 1–6., (1992).
22. Alonso, E.E., Romero, E., Hoffmann, C. and Carcỉa-Escudero, E., "Expansive bentonite-and mixtures in cyclic controlled-suction drying and wetting", Engineering Geology, Vol. 81, No. 3, pp. 213-226, (2005).
23. Nowamooz, H. and Masrouri, F., "Hydromechanical behaviour of an expansive bentonite/silt mixture in cyclic suction-controlled drying and wetting tests", Engineering Geology, Vol. 101, No. (3–4), pp. 154–164, (2008).
24. Eimanifar, A. and Mohebbi, F., "Urmia Lake (Northwest Iran): a brief review", Saline Systems, Vol. 3, No.5, pp. 1-8, (2007).
25. Soltani, A. and Estabragh, A.R., "Laboratory study of expansive soil treatment using consecutive wetting and drying cycles", Journal of Water and Soil Resources Conservation, Vol. 4, No. 1, 49-62, (2014). (In Persian)
26. Estabragh, A.R., Javadi, A.A. and Boot, J.C., "Effect of compaction pressure on consolidation behaviour of unsaturated silty soil", Canadian Geotechnical Journal, Vol. 41, No. 3, pp. 540-550, (2004).
27. Wheeler, S.J. and Sivakumar, V., "An elasto-plastic critical state framework for unsaturated soil", Géotechnique, Vol. 45, No. 1, pp. 35-53, (1995).
28. Fredlund, D.G. and Rahardjo, H., "Soil mechanics for unsaturated soils", John Wiley & Sons, (1993).
29. Ridley, A.M., Dineen, K., Burland, J.B. and Vaughan, P.R., "Soil matrix suction: some examples of its measurement and application in geotechnical engineering", Géotechnique, Vol. 53, No. 2, pp. 241-253, (2003).
30. Leong, E.C., He, L. and Rahardjo, H., "Factors affecting the filter paper method for total and matric suction measurements", Geotechnical Testing Journal, Vol. 25, No. 3, pp. 322-333, (2002).
31. Seed, H.B. and Chan, C.K., "Structure and strength characteristics of compacted clays", Journal of the Soil Mechanics and Foundations Division, Vol. 85, No. 5, pp. 87-128, (1959).
32. Barden, L. and Sides, G.R., "Engineering behavior and structure of compacted clay", Journal of the Soil Mechanics and Foundations Division, Vol. 96, No. 4, pp. 1171-1200, (1970).
33. Barbour, S.L. and Fredlund, D.G., "Mechanisms of osmotic flow and volume change in clay soils", Canadian Geotechnical Journal, Vol. 26, No. 4, pp. 551-562, (1989).
34. Pulat, H. F., Yukselen-Aksoy, Y. and Egeli, İ., "The effect of soil mineralogy and pore fluid chemistry on the suction and swelling behavior of soils", Bulletin of Engineering Geology and the Environment, Vol. 73, No. 1, pp. 37–42, (2014).
35. Delage P., Howat M.D. and Cui Y.J., "The relationship between suction and swelling properties in a heavily compacted unsaturated clay", Engineering Geology, Vol. 50, No. (1-2), pp. 31–48, (1998).
36. Bouazza, A., Jefferis, S. and Vangpaisal, T., "Investigation of the effects and degree of calcium exchange on the Atterberg limits and swelling of geosynthetic clay liners when subjected to wet–dry cycles", Geotextiles and Geomembranes, Vol. 3, No. 25, pp. 170–185, (2007).
37. Bayrak MC, "Zemin Suyu O¨ zelliklerinin Emme Basıncı U¨ zerindeki Etkileri", MSc. thesis, University of Su¨leyman Demirel, Fen Bilimleri Enstitu¨su¨, Turkey (in Turkish), (2008).
38. Pandya, S. and Sachan, A., "Matric suction, swelling and collapsible characteristics of unsaturated expansive soils", Journalof Geotechnical and Transportation Engineering, Vol. 4, No. 1, pp. 1-9, (2018).
39. Tan, L. and Kong, L., "Study of swelling-shrinkage regularity of montmorillonite crystal and its relation with matric suction", Science in China (Series D: Earth Sciences), Vol. 44, No. 6, pp. 498-507, (2001).
40. Fredlund, D.G. and Xing, A., "Equations for the soil-water characteristic curve", Canadian Geotechnical Journal, Vol. 31, No. 4, pp. 521-532, (1994).