EFFECT OF CEMENTATION ON THE SHEAR STRENGTH OF COARSE GRAINED ALLUVIUM OF TEHRAN

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HAERI S.M.; YASROBI S.S.; OUROUMIEHEI ALI; ASGHARI E.

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Paper Information

Journal: AMIRKABIR Year:2004 | Volume:15 | Issue:59-C Page(s): 43-57

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Title

EFFECT OF CEMENTATION ON THE SHEAR STRENGTH OF COARSE GRAINED ALLUVIUM OF TEHRAN

Author(s)

HAERI S.M. | YASROBI S.S. | OUROUMIEHEI ALI | ASGHARI E.

Keywords

CEMENTATIONQ4

COARSE-GRAINED SOILQ3

LIMEQ2

SHEAR STRENGTHQ4

TEHRAN ALLUVIUMQ4

Abstract

Earth slopes and high vertical cuts are frequently observed to be stable for long period in the coarse-grained soils of Tehran. Their stability is often attributed to cementation effects that produce improved shear strength parameters. These soils are heterogeneous not only in gradation and density but also in cementation. Due to this heterogeneity and the extreme difficulty in obtaining undisturbed samples, artificially cemented specimens using lime as the cementing agent are used to understand the effects of cementation on the shear strength parameters. A base soil with 45% gravel, 49% sand and 6% fine material was used, based on gradation curves of the coarse-grained soils of Tehran. Specimens with 100mm diameter and 200mm height are prepared by mixing of the soil with 1.5, 3, and 4.5 percent by weight lime and after curing weretested using drained triaxial compression tests. Samples were also tested in uncemented and destructured conditions. The results of the tests indicate that the cementation increases peak shear strength, suggesting an increase in cohesion. Cemented samples show a brittle failure mode at low confining pressure with a transition to a ductile failure mode at higher confining pressures. The stress-strain curves for cemented samples show a clear peak stress followed by a sudden drop in stress and strain softening. There is no clear peak in shear stress for uncemented and destructured samples. The failure envelope is curved for cemented samples. The influence of cementation on the friction angle of the tested samples is a function of confining pressure, and degree of cementation. The results show that the peak friction angle at low confining pressure increases with increase in cementation. The residualfriction angle is almost equal for cemented, destructured and uncemented samples.

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References

ENGINEERING GEOLOGY ASPECTS OF CEMENTED COARSE GRAINED ALLUVIUM OF TEHRAN

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APA: Copy

HAERI, S.M., YASROBI, S.S., OUROUMIEHEI, ALI, & ASGHARI, E.. (2004). EFFECT OF CEMENTATION ON THE SHEAR STRENGTH OF COARSE GRAINED ALLUVIUM OF TEHRAN. AMIRKABIR, 15(59-C), 43-57. SID. https://sid.ir/paper/891/en

Vancouver: Copy

HAERI S.M., YASROBI S.S., OUROUMIEHEI ALI, ASGHARI E.. EFFECT OF CEMENTATION ON THE SHEAR STRENGTH OF COARSE GRAINED ALLUVIUM OF TEHRAN. AMIRKABIR[Internet]. 2004;15(59-C):43-57. Available from: https://sid.ir/paper/891/en

IEEE: Copy

S.M. HAERI, S.S. YASROBI, ALI OUROUMIEHEI, and E. ASGHARI, “EFFECT OF CEMENTATION ON THE SHEAR STRENGTH OF COARSE GRAINED ALLUVIUM OF TEHRAN,” AMIRKABIR, vol. 15, no. 59-C, pp. 43–57, 2004, [Online]. Available: https://sid.ir/paper/891/en

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