Geomechanics and Engineering

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Effect of particle size and saturation conditions on the breakage factor of weak rockfill materials under one-dimensional compression testing

  • Rahmani, Hamidreza (Faculty of Civil and Environmental Engineering, Tarbiat Modares University) ;
  • Panah, Ali Komak (Faculty of Civil and Environmental Engineering, Tarbiat Modares University)
  • Received : 2019.07.16
  • Accepted : 2020.03.20
  • Published : 2020.05.25
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Abstract

The long-term behavior of rockfill material used in the construction of infrastructures such as dams is of great significance. Because of concerns about the application of weak rockfill material in dam construction, further experimental studies on the behavior of these materials are required. In this study, laboratory experiments were performed to investigate the one-dimensional deformation and particle breakage of the weak rockfill material under stress. A one-dimensional compression apparatus was designed and developed for testing of rockfill materials of different maximum particle sizes (MPSs). The compression tests were performed under dry, wet and saturated conditions on samples of rockfill material obtained from a dam construction site in Iran. The results of the experiments conducted at the specimen preparation stage and the 1D compression tests are presented. In weak rockfill, the effect of the addition of water on the behavior of the material was uncertain as there were both an increases and decreases observed in particle breakage. Increasing the MPS of the weak rockfill materials increased particle breakage, which was similar to the behavior of strong rockfill material. In all of the MPSs examined, the settlement of specimens under wet conditions was higher than that observed under dry conditions. Also, the greatest deformation occurred during the first hour of loading.

Keywords

Acknowledgement

The authors would like to thank Mr. Mousavi and Mr. Keshavarz of the Qazvin Regional Water Company for their kind support and cooperation during the material sampling in this study

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