مطالعه مروری: خاک‌های متورم شوندة گچ‌دار و روش‌های بهسازی آن‌ها با رویکرد ویژه بر تثبیت بستر راه

نویسندگان

1 مـدیر عـمرانی حـوزه معاونت فنی و عمرانی شـهرداری شـیراز

2 کارشناسی عمران دانشگاه آزاد اسلامی واحد استهبان

3 دانشجوی دکتری عمران دانشگاه بوعلی سینا و کارشناس‌ارشد معاونت فنی و عمرانی شهرداری شیراز

چکیده

 
وجود خاک ­های متورم ­شونده در سراسر دنیا خسارت جبران ناپذیری را به ساختمان ­ها از جمله سازه‌های روسازی وارد می­ نماید. خاک­ های گچی به دلیل خاصیت تورم­ زایی که دارند از دیرباز مشکل‌هایی مانند ایجاد ترک در نمای ساختمان­ ها، شکم دادن دیوارها و برآمدگی کف سازی­ ها را به‌وجود آورده ­اند. از طرفی بهسازی این‌گونه خاک ­ها که در زمره خاک­ های مسأله ­دار هستند همیشه مورد توجه محققان بوده است. در این مطالعه سعی شده تا با بررسی جامع، راهکاری جهت تثبیت خاک­ های متورم شونده گچ­ دار ارائه گردد و هم‌چنین درخصوص تثبیت با آهک بر اساس آزمون pH و بررسی میزان تنش پیش تحکیمی، میزان درصد آهک لازم برای تثبیت خاک­ها تعیین می­ گردد. به گونه ­ای که بر اساس آزمون ­های مکانیکی به ازای افزایش هر درصد آهک، افزایش میزان تنش پیش تحکیمی مدنظر قرار می­ گیرد.

کلیدواژه‌ها


الف. فارسی
غیاثیان، حسین و ابراهیمی، مهدی. (۱۳۸۱). تاثیراختلاط آهک و نوع خاک بر مقاومت وتورم. خاک­های سولفاته. نشریه ژئوتکنیک و مقاومت مصالح، 89: ۱-13.
فاخر، علی و عسگری، فرج­الله. (1372). تورم و واگرایی خاک­ها از دید مهندسی ژئوتکنیک، تهران: انتشارات جهاد دانشگاهی دانشگاه تهران.
ب. انگلیسی
Azam, S., Abduljauwad, S. N., Al-Shayea, N.A., Al-Amoudi, O.S.B. (2000). Expansive characteristics of gypsiferous/ anhydritic soil formations. Eng. Geol. 51: 89–107.
Afès, M., Didier, G. (2000). Stabilization of expansive soils: The case of clay in the area of Mila (Algeria). Bulletin of Engineering Geological Environment, 59(1): 75-83.
Al-Rawas, A. A., Hago, A. W., Al-Sarmi, H. (2005). Effect of lime, cement and Sarooj (artificial pozzolan) on the swelling potential of an expansive soil from Oman Building and Environment, 40 (5): 681–687.
Bugge W. A. and Bartelsmeyer R. R. (1961). Soil Stabilization with Portland Cement. National Research Council, Washington, DC, Highway Research Board Bulletin, 292: 1–15.
Bandyopadhyay, S. S. (1981). Prediction of Swelling Potential for Natural Solis. Journal of Geotechnical Engineering Division, ASCE, 107. GTS.
Basma, A. A. (1993). Prediction of Expansion Degree for Natural Compacted Clays, Geotechnical Testing Journal, GTJODY, 16 (4).
Basma A. A., Tuncer E. R. (1991). Effect of lime on volume change and compressibility of expansive clays, Transportation research record, 1295: 52-61.
Bell, F. G. (1996). Lime stabilization of clay minerals and soil. Engineering Geology, 42(4), 223–237.
Chen F. H. (1988). In Developments in Geotechnical Engineering, Vol. 12. Foundations on expansive soils. Elsevier, Amsterdam.
Das, B. M. (1990). Principle of foundation engineering, PWS-KENT publishing company, Boston.
Donaldson, G. W. (1969). The Occurrence of Problems of Heave and the Factors Affecting its Nature. Second International Research and Engineering Conference on Expansive Clay Soils, Texas A & M Press.
Eades, J. L., Grim, R. E. (1966). A quick test to determine lime requirements for soil stabilization. Highway Research Record, 139: 61–72.
Einstein H. H. (1996). Tunneling In Difficult Ground. Swelling Behavior and Identification of Swelling Rocks، Rock Mech. Rock Engineering, 29 (3), 113-124.
Ferris, G. A., J. L. Eades, R. E. Graves and G.H. Mclellan. (1991). Improved characteristics in sulfate soils treated with barium compounds before lime stabilization. Transportation Res. Rec. 1295 TRR.
Hausmann M. R. (1990). Engineering Principles of Ground Modification. McGraw-Hill, New York.
Hunter D. (1988). Lime-induced heave in sulfate-bearing clay soils. Journal of Geotechnical Engineering, ASCE, 114 (2): 150-167.
Ingles, O. G., Metcalf, J. B. (1987). Soil Stabilization Principles and Practice. Butterworths, Melbourne.
Jahanshahi, M. (2005). An Improvement Method for Swell Problem in Sulfate Soils that Stabilized by Lime, American Journal of Applied Sciences, 2(7): 1121-1128.
Khattab S. A. A. (2002). Etude multi-échelles d'un sol argileux plastique traité à la chaux. PhD thesis, University of Orléans, France, 249.
Little N. D. (1987). Fundamentals of the Stabilization of Soil with Lime. National Lime Association Bulletin, 332.
Mallela, J., Quintus, H. V. and Smith, K. (2004). Consideration of lime-stabilized layers in mechanistic-empirical pavement design. The National Lime Association.
Mehta, P. K. (1973). Effect of Lime on Hydration of Pastes Containing Gypsum and Calcium Aluminates or Calcium Sulfoaluminate. Journal of the American Ceramic Society, 56(6): 315–319.
Mitchell J. K. (1984). Practical problems from surprising soil behavior. Journal of Geotechnical Engineering, 112(3): 259-289.
Nicholson P. G. and Kashyap V. (1993). Fly Ash Stabilization of Tropical Hawaiian Soils. ASCE Geotechnical Special Publication, 36, 15–19.
Nalbantoglu, Z., Tuncer, E. R. (2001). Compressibility and hydraulic conductivity of a chemically treated expansive clay. Canadian Geotechnical Journal, 38, 154–160.
Ozyildirim H. C. (1990). Admixtures and Ground Slag for Concrete. National Research Council, Washington, DC, Transportation Research Board, 365: 33-43.
Ouhadi, V. R., Yong, R. N., Amiri, M., Ouhadi, M. H. (2014). Pozzolanic consolidation of stabilized soft clays. Appl. Clay Sci. 95: 111–118.
Perrin, L. (1992). Expansion of lime-treated clays containing sulphates. Proceedings of the Seventh International Conference on Expansive Soils, ASCE Expansive Soils Research Council, New York, 1, 409–414.
Puppala A. J. and Musenda C. (2000). Effects of Fiber Reinforcement on Strength and Volume Change Behavior of Expansive Soils. National Research Council, Washington, DC, Transportation Research Board TRR, 1721.
Puppala, A. J., Wattanasanticharoen, E. and Punthutaecha, K. (2003). Experimental Evaluations of Stabilization Methods for Sulphaterich Expansive Soils. Ground Improvement, 7 (1), 2003. 25-35.
Puppala, A. J., Naga S. Talluri., Bhaskar S. Chittoori and Ahmed Gaily. (2012). Lessons Learned from Sulfate Induced Heaving Studies in Chemically Treated Soils. Proceedings of the International Conference on Ground Improvement and Ground Control. Research Publishing, 1(November): 85-98.
Prakash B. S. Kota, Darren Hazlett and Les Perin. (1996). Sulfate-bearing soils: Problems with calcium-based stabilizers. Transportation Res. Rec. 1546 TRR.
Rajasekaran, G. (2005). Sulphate attack and ettringite formation in the lime and cement stabilized marine clays. Ocean Engineering, 32 (8–9): 1133-1159.
Schoute, E. J. (1999). Chemical Stabilization of Soft Clay. MS thesis, Delft University. Memoirs of the Centre of Engineering Geology in the Netherlands, No. 188.
Terzaghi, K., Peck, R. B., Mesri, G. (1996). Soil Mechanics in Engineering Practice. John Wiley & Sons. Inc.
Thompson, M. R. (1966). Shear strength and elastic properties of lime-soil mixtures. Highway Research Record, Washington, D.C., 139, 1-14.
Twinhofel, W.H. (1950). Principles of Sedimentation. 2nd Ed, Mc Graw-Hill Book Co., Inc.
Viswanadham, B.V.S., Phanikumar, B.R., Mukherjee, Rahul V. (2009). Swelling behaviour of a geofiber-reinforced expansive soil. Geotextiles and Geomembranes. 27 (1): 73–76.
Wang, L. (2002). Cementitious Stabilization of Soils in the Presence of Sulfate. Ph.D. dissertation. Louisiana State University, Baton Rouge.
Yaujun Du, Shenglin Li, Shigenori Hayashi. (1999). Swelling-Shrinkage Properties and Soil Improvement of Compacted Expansive Soil, Ning-Liang Highway, China. Engineering Geology 53: 351-358
Yong, R. N., Ouhadi, V. R. (2007). Experimental study on instability of bases on natural and lime/cement-stabilized clayey soils. Appl. Clay Sci. 35(3–4): 238–249.