ABSTRACT
This study examined the fracture morphology properties of rock cores and studied the mechanical characteristics of jointed rock at depths of 2400 m, with inclinations of 15°, 30°, and 60°. The results showed that jointed rock is significantly controlled by joint weak areas, particularly when the joint inclination exceeds 30°. Additionally, rock damage increases with joint inclination during engineering disturbance, however, its pre-peak plastic characteristics weaken with joint inclination. The damage stress level is higher with a larger joint inclination, decreasing the bearing capacity. Further, a strength criterion for jointed rock considering engineering disturbance was established. It is found that strength exhibits a V-shaped distribution with joint inclination, and 30° to 75° jointed rock is significantly lower than before the disturbance.
KEYWORDS
PAPER SUBMITTED: 2023-03-07
PAPER REVISED: 2023-05-12
PAPER ACCEPTED: 2023-05-17
PUBLISHED ONLINE: 2023-11-05
THERMAL SCIENCE YEAR
2023, VOLUME
27, ISSUE
Issue 5, PAGES [3829 - 3836]
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