Open AccessNumerical evaluation of rock strength with different sizes of circular opening
Author(s) -
Moataz A. Al-Obaydi,
Yussra H Al-Jobory
Publication year - 2020
Publication title -
iop conference series. materials science and engineering
Language(s) - English
Resource type - Journals
eISSN - 1757-899X
pISSN - 1757-8981
DOI - 10.1088/1757-899x/737/1/012090
Subject(s) - ultimate tensile strength , flexural strength , compressive strength , overburden pressure , materials science , compression (physics) , strength reduction , geotechnical engineering , composite material , geology , structural engineering , engineering , finite element method
The presence of opening in the rock may be natural or artificial. In such circumstances, the stability should be examined through studying the strength of the rock. In the present study, the effect of size of the circular opening on the compressive and flexural strengths of limestone rocks has been studied. Both, the compressive and flexural strengths under confining pressure have been examined numerically. Two types of 2D-rock models have been studied are (200×200 mm 2 ) and (200×700 mm 2 ), respectively, for compression and flexural states with three sizes of openings having diameters of 10, 25, and 40 mm. The results of compression state showed that the strength reduces with existing opening and the reduction increases with the size of opening. The unconfined rock exhibited higher reduction in the strength than that of confined one with exists of opening. In case of flexural state, both compressive and tensile strengths increase with the increasing confining pressure, while they decrease with the opening size. At higher confining pressure, the size of opening has insignificant effect on the tensile strength. The tensile strength of the unconfined rock remains unchanged with increase in the size of opening beyond certain limit.