Shearing behavior of Carbonate Sand of Khark Island Cemented by a Pseudo-natural Method

Document Type : Research Article

Authors

1 Civil Engineering Department, Faculty of Engineering, Fasa University, Fasa, Iran.

2 Civil Engineering Department, Fasa University

Abstract

In the present study, the effect of natural cementation on the shearing behavior of carbonate sand of Khark Island, south of Iran, has been investigated. To do so, a pseudo-natural cementation method was employed. The importance of this technique lies in its suitability as a substitute for undisturbed samples of cemented carbonate soil that are hard and costly to prepare. Uncemented and cemented samples provided by this method were tested using direct shear apparatus and the results were analyzed and compared to one another. Furthermore, the effects of factors such as curing time and relative compaction on the shearing behavior of the Khark sand were studied. It was observed that cementation results in the rise of the shearing resistance, in particular at high vertical stresses, and leads to a decline in the tendency of soil to dilation. While cementation led to growth in the internal friction angle of soil, it may cause an increase, a decrease, or no change in the cohesion of the Khark sand.  The increase in curing time led to a considerable rise in the cohesion and a minor change in the internal friction angle of the cemented soil. Furthermore, results showed that as the relative compaction of the investigated cemented carbonate soil goes up, the cohesion of the soil might increase, decline, or stay unchanged while the internal friction angle always increases. Factors that are likely to contribute to the development of the behavior stated earlier were introduced and their effects were discussed thoroughly.

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References

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Amirkabir Journal of Civil Engineering
Volume 53, Issue 6
September 2021
Pages 2415-2434

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