Static examination of the interface behavior of the filter soil material-the asphaltic concrete core using direct shear apparatus- Case study: Mijran dam

Document Type : Research Article

Authors

1 Department of Civil Engineering, Najafabad Branch, Islamic Azad University, Najafabad, Iran

2 Department of Geology, University of Isfahan, Isfahan, Iran

Abstract

 Recently, the advantages of using asphalt concrete in the core compared to the clayey core have increased the application of core asphalt concrete in embankment dams. Due to the importance of the interfacial behavior of the asphaltic core and soil filter in the stability of these dams and the need for a more detailed investigation of the complex behavior of materials in the core-­filter interface, in the present research, interfacial behavior of soil filter and asphalt core in the Mijran embankment dam (Mazandaran province) was investigated. For this purpose, a direct shear apparatus on a large scale is used. Soil materials­, including clayey gravel (GC) and poorly graded gravel (GP), are according to the grain size distribution used in Mijran dam construction­. In this research, the influence of factors such as compaction percentage of filter material and shear rate were investigated on shear strength and interlocking parameters (­dilatancy angle and shear stiffness)­, as well as interaction ratio in the soil of filter and the core asphalt concrete interface. In this investigation, the ratio of the interfacial friction angle of soil material- asphalt concrete to the soil materials friction angle was defined as the interaction ratio. According to the findings, upon increasing the compaction level, the increasing amount in the interaction ratio in the interface GP material was higher compared to the GC material in the interface. On the other hand, the influence of the shear rate on the interaction ratio was similar in both the GC and GP materials in the interface.

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Main Subjects

References

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Amirkabir Journal of Civil Engineering
Volume 55, Issue 2
May 2023
Pages 407-430

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