Evaluation of Granite Deformation Through Non-compliant Versus Compliant Indirect Tensile Strength Application

Abugharara, Abdelsalam N. A. and Butt, Stephen (2023) Evaluation of Granite Deformation Through Non-compliant Versus Compliant Indirect Tensile Strength Application. In: ASME 2023 42nd International Conference on Ocean, Offshore and Arctic Engineering, June 11–16, 2023, Melbourne, Australia.

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Abstract

Rock deformation evaluation as an essential approach for rock characterization and property determination has been examined via several methods through experimental and simulation studies. Such methods are reported to be conventional techniques applied to define the rock stress-strain relationship that consists of several regions including elastic and plastic regions. The load-displacement relationship also determines the yield and the breakage limits and shows the overall rock deformation behavior. The focus of this research is to evaluate the rock deformation behaviour through the implementation of compliant loading versus non-compliant. In this new approach and unconventional testing technique, the ultimate rock strength through rigid compression and the trend of the load displacement curve were firstly determined. Secondly, Belleville springs were utilized in various stacks as per their full compression loads to determine the compression levels of 50% and 100% compression ranges of the non-compliant loading application. Results of testing about 150 samples of granite as high strength formation by indirect tensile tests, the compliant loading using Belleville conical disc springs compared with the non-compliant “rigid” loading was observed to influence the load-displacement curve to shift and the ultimate rock main failure to delay in the favor of compliant loading. Results also showed changes in granite fracture mode from pure and clean tensile in the case of non-compliant to a combination of tensile with rupture fractures in the 50% and the 100 compliant application. Such curve shift, rock failure delay, fracture modes, and overall deformation behaviour allow providing valuable data for controlling and predicting rock failure. This could also be used in optimally applying drilling parameters to evaluate rock fragmentation, improve the rate of penetration, and for safely designing civil structures.

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