بررسی کارایی آهک زنده و شکفته جهت بهسازی خاک‌های جنگلی حاوی مواد آلی

نوع مقاله: مقاله پژوهشی

نویسندگان

1 گروه زمین شناسی، دانشکده علوم پایه، دانشگاه بوعلی سینا، همدان، ایران

2 استادیار،‌ گروه زمین‌شناسی مهندسی دانشکده علوم پایه دانشگاه تربیت مدرس nikudelm@yahoo.com

3 کارشناس ارشد زمین‌شناسی مهندسی، دانشگاه بوعلی سینا، دانشکده علوم، همدان

چکیده

از نظر زمین‌شناسی مهندسی، خاک­های آلی به­ویژه خاک­های جنگلی در رده های خاک­های مسأله­دار قرار می­گیرند که به دلیل حضور مواد آلی در آن­ها و شرایط جوی پر­بارش، مشکلات عدیده­ای را در اغلب پروژه­ها ایجاد می­کنند. از جمله این مشکلات می‌توان به ظرفیت باربری پایین، نشست زیاد در محل شالوده سازه­ها و غیره اشاره کرد که در صورت حضور این خاک­ها در محل پروژه­ها باید آنها را بهسازی و تقویت نمود. در این مقاله تأثیر افزودن آهک زنده و شکفته و نیز دوره عمل‌آوری بر پارامتر­های ژئوتکنیکی خاک آلی جنگل شهید زارع ساری بررسی شده و کارایی روش­های به­کاررفته، مطالعه شده است. نتایج آزمایش­ها حاکی از این است که آهک شکفته بر خاصیت متراکم شدن خاک آلی موثرتر از آهک زنده است. همچنین تأثیر آهک زنده در افزایش مقاومت فشاری نمونه­های اصلاح شده مشهود­تر می­باشد. در این بررسی مقادیر بهینه آهک زنده 5 درصد و آهک شکفته 7 درصد تعیین گردید.

کلیدواژه‌ها

موضوعات


عنوان مقاله [English]

The study of efficiency of quicklime and hydrated lime for stabilization of forest soils contains organic materials

نویسندگان [English]

  • Seyed Davoud Mohammadi 1
  • Mohammadreza Nikudel 2
  • Azam Golestani 3
1 Dep. of Geology, Faculty of Sciences, Bu-Ali Sina University, Hamedan, Iran
2 Assistant professor, Department of Engineering Geology, Tarbiat Modares University, nikudelm@modares.ac.ir
3 M.Sc. of Engineering Geology, Bu Ali Sina University, Hamedan, Iran.
چکیده [English]

In engineering geology the organic soils are classified as problematic soils. Because of the organic matter presence in them, are created many problems in most projects. Some of these problems are low bearing capacity, excessive settlement in foundations, swelling, etc. If the organic soils are available on project sites, it should be stabilized. This research describes a study on the effect of quicklime and hydrated lime on geotechnical properties of organic soils in Shahid Zare forest and efficiency of used method. The results show that the hydrated lime more effective than quicklime on the compaction properties of organic soils. The effect of quicklime in increasing of compressive strength is more than of hydrated lime. In this study optimum amount of quicklime and hydrated lime determined 5% and 7% respectively. 

کلیدواژه‌ها [English]

  • Geotechnical parameters
  • Problematic soil
  • Compressive strength
  • CBR
  • Undrained shear strength
ASTM C593, 2001. Standard specification for fly ash and other pozzolans for use with lime. Annual Book of

ASTM Standards, Vol. 04.01, ASTM, Philadelphia, Pa.

ASTM D1556 – 07, 1998. Standard Test Method for Density and Unit Weight of Soil in Place by the Sand-Cone

Method, Annual Book of ASTM Standards.

ASTM D2216, 2000. Standard test method for laboratory determination of water (moisture) content of soil and

rock by mass. Annual Books of ASTM Standards.

ASTM D854, 2000. Standard test methods for specific gravity of soils. Annual Books of ASTM Standards.

ASTM D 2974, 1995. Standard method for moisture, ash and organic matter of peat and other organic soils.

Annual Books of ASTM Standards.

ASTM D698, 2000. Standard test methods for laboratory compaction characteristic. Annual Books of ASTM

Standard.

ASTM D2166, 2000. Standard test method for unconfined compressive strength of cohesive soils. Annual Books

of ASTM Standard.

ASTM D2435, 2000. Standard test method for one dimensional consolidation properties of soils. Annual Books of

ASTM Standard.

ASTM D422, 2000. Standard test methods for particle size analysis of soils. Annual Books of ASTM Standards.

ASTM D3080, 2000. Standard test method for direct shear test of soils. Annual Books of ASTM Standards.

ASTM D4318, 2000. Standard test method for liquid limit, plastic limit and plasticity index of soil. Annual Books

of ASTM Standards.

ASTM D4648 / D4648M – 10, 2000. Standard test method for laboratory miniature vane shear test for saturated

fine-grained clayey soil, . Annual Books of ASTM Standards.

ASTM WK27337, 2003. New test method for pocket penetrometer test, Annual Books of ASTM Standards.

ASTM D2974 - 07a, 1993. Standard test methods for moisture, ash, and organic matter of peat and other organic

soils, Annual Books of ASTM Standards.

Ahnberg, H., Johanson, S., 2005. Increase in strength with time in soils stabilized with different types of binder in

relation to the type and amount of reaction products. Reprinted with permission from the Swedish Deep

Stabilization Research Centre. From Proceedings of the International Conference on Deep Mixing Stockholm.

Vol. 1.1.

Benjet, B.B., 1993. Ground Improvement. John Willey and Sons Publishing Company.

Chikiyala, S.R., 2008. The Effects of calcium-based treatment on organic soil behavior. M.Sc thesis. University of

Texas at Arlington.

Chen, F.H., 1979. Foundations on expansive soils, Elsevier Science. Amsterdam, The Netherlands.

Cheng, X.H., Ngan-Tillard, D.J.M., Den Haan, E.J., 2007. The causes of the high friction angle of Dutch organic

soils. Engineering Geology 93: 31–44.

Hans, F., (1990). Foundation Engineering–Soil Stabilization and Grouting. New York.

Huat, B., Maail, S.H., Mohamed, T.A., 2005. Effect of Chemical Admixtures on the Engineering Properties of

Tropical Peat Soils. American Journal of Applied Sciences, 2 (7): 1113-1120.

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.

Muntohar, A.S., Hamtoro. G., 2000. Influence of rice hack ash and lime on engineering properties of a clayey

subgrades. Electronic Journal of Geotechnical Engineering, paper 094, Oklahoma state university, USA.

Myslinska, E., 2003. Classification of organic soil for engineering geology. Geological Quarterly, 47 (1): 39 - 42.

Naji, S.A., 2002. The use of lime to stabilize granular volcanic ash material for road construction. Journal of

Sciences and Technology, Vol. 7, No. 2, 115-123.

Oates, J.A.H., 1998. Lime and Limestone. John Willey and Sons Publishing Company.

Sakr, A., Shahin, M.A., Metwally, Y.M., 2009. Utilization of lime for stabilizing soft clay soil. Geotechnical and

Geolgical Engineering, 27:105–113.

Thompson, M.R., 1970. Suggested Methods of Mixture Design Procedure for Lime-Treated Soils, American

Society for Testing and Materials. ASTM, Special Technical Publication, 479, Special Procedures for Testing

Soil and Rock for Engineering Purposes.

Wilson, S.D., 1950. Small Soil Compaction Apparatus Duplicates Field Results Closely. Engineering News

Record.

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