Mechanical properties of marble with different joint inclinations under engineering disturbance

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 degrees, 30 degrees, and 60 degrees. The results showed that jointed rock is significantly controlled by joint weak areas, particularly when the joint inclination exceeds 30 degrees. 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 degrees to 75 degrees jointed rock is significantly lower than before the disturbance.