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Numerical Modeling and Triaxial Shear Testing of Cemented Rockfill Abstract The Triaxial Machine is a machine that can be used to test the stress and strain of a cement, rock, or plaster cylinder. The machine uses a hydraulic ram to put pressure on the specimen, and then the stress and strain on the specimen are measured by the computer that is attached to the machine. UCS testing stands for unconfined compressive strength testing. This means that the cylindrical specimen is tested without any confining pressure. CRF (cemented rock fill) is defined as a combination of aggregate (often waste rock), cement and water. It is used to fill in mine voids that have been left after mining, and thus provides stability for underground mining stopes. Backfill is becoming more useful in the mining industry as mines go deeper underground. Use of this material also allows for higher extraction of intrinsically valuable minerals. The main purpose for this research project was to study the effects of large voids in backfill material on the strength and stiffness characteristics of the material. The purpose of this research is to validate the relationship between cement content and porosity to the unconfined compressive strength of CRF for test specimens. By understanding how much cement should be added to different gradations for desired strengths of CRF, this project will help mines save money on cement, which is rather costly. For the project, I had to choose three different gradations to test with different percentages of cement in them. Once the particle size ranges were validated, the material was mixed with water and cement and then packed into a 6 x 12-inch cylinder. These specimens were cured for 28 days to develop their maximum strength. Then the specimens were tested on the triaxial machine in unconfined compression (UCS). Biography
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