LEACHING BEHAVIOR OF GYPSEOUS SOILS
محتوى المقالة الرئيسي
الملخص
A series of laboratory tests were carried out on disturbed soil samples containing different gypsum contents. The soil samples were obtained from al-Jazeera south-west of Iraq. Tests were performed to obtain the physical and mechanical properties of the soil. In addition; permeability-leaching tests were conducted by using oedometer and large-scale Rowe cell apparatus to obtain the variation of the coefficient of permeability, dissolved gypsum and leaching strain with time. All samples were tested under similar conditions, e.g. the hydraulic gradient, vertical stress and leaching period. The soil samples designated N1, N2, and N3 are obtained from depths (0.5-0.75), (1.0-1.25), and (3.25-3.5) m and having gypsum content (31.43), (51.37), and (4.86) percentage respectively. Results of experimental work show that the coefficient of permeability, the percentages of dissolved gypsum and leaching strain measured from the oedometer test are higher than that measured from large-scale Rowe cell test for the same soil sample. The gypseous soil with higher gypsum content exhibited significant amount of leaching strain.
تفاصيل المقالة
القسم
كيفية الاقتباس
المراجع
* Al-Ani, M.M., and Seleam, S.N. (1993),"Effect of Initial Water Content and Soaking Pressure on the Properties of Gypseous Soils”, Al-Muhandis J., Iraqi Eng. Union, Vol.116, pp.3-12.
* Al-Busoda, B.S.Z. (1999),"Studies on the Behavior of Gypseous Soil and its Treatment during Loading", M.Sc. Thesis, Civil Eng. Dept., University of Baghdad.
* Al-Kaabi, F.S. (2007),"Distribution of the Gypsiferous Soil in Iraq", State Company of Geological Survey and Mining, Report No.3044, Iraq, Baghdad, (in Arabic).
* Al-Khuzaie, H.M.A. (1985),"The Effect of Leaching on the Engineering Properties of Al-Jazirah Soil", M.Sc. Thesis, Civil Eng. Dept., University of Mosul, Iraq.
* Al-Mufty, A.A. and Nashat, I.H. (2000),"Gypsum Content Determination in Gypseous Soils and Rocks", Third International Jordanian Conference on Mining, Amman, pp.500-506.
* Al-Obaidi, A.L.M. (2007),"Gypseferrous Soil Behaviour by Finite Element Method", Ph.D. Thesis, Civil Eng. Dept., University of Baghdad.
* Al-Qaisee, G.S.H. (2001),"Leaching Collapse of Gypseous Soils", M.Sc. Thesis, Civil Eng. Dept., University of Baghdad.
* Al-Rawi, M.K. (2003),"Effect of Long-Term Soaking on the Engineering Properties of Gypseous Soils", M.Sc. Thesis, Civil Eng. Dept., University of Mosul, Iraq.
* Annual Book of ASTM Standards (1977 & 1979),"Soil and Rock; Building; Stone; Peats", Vol.04.08, Part1.
* Annual Book of ASTM Standards (2003),"Soil and Rock; Building; Stone; Peats", Part1.
* Bowles, J.E. (1986), "Engineering Properties of Soil and their Measurement", McGraw-Hill Book Co., Fifth Edition, New York.
* BS 1377 (1976),"Methods of Testing for Civil Engineering Purpose", British Standards Institution, London.
* Head, K.H. (1984; 1988; 1986),"Manual of Soil Laboratory Testing", Vol.1; Vol.2 & Vol.3 Pentech Press, London.
* Ismeal, N.F. (1993),"Laboratory and Field Leaching Tests on Coastal Salts-Bearing Soils", Journal of Geotechnical Engineering, Vol.119, No.3, pp.453-470.
* Ismeal, N.F. and Mollah, M.A. (1998),"Leaching Effects on Properties of Cemented Sands in Kuwait", J. of Geotechnical and Geoenvironmental Eng., Vol.124, No.10, pp.997-1004.
* Karkush, M.O. (2008),"Theoretical Modeling and Experimental Investigation of the Leaching Behavior of Gypseous Soil", Ph.D. Thesis, Civil Eng. Dept., University of Baghdad.
* Lambe, T.W. and Whitman, R.V. (1995),"Soil Mechanics", John Wiley and Sons, New York.
* Mahdi, B.O. (2004),"Some Aspects of Gypseous Soil of the Middle Part of Iraq", Ph.D. Thesis, Civil Eng. Dept., University of Baghdad.
* Nashat, I.H. (1990),"Engineering Characteristics of Some Gypseous Soils in Iraq", Ph.D. Thesis, Civil Eng. Dept., University of Baghdad.