Dynamic microscopic deformation and mechanical properties of non-penetrating jointed rock masses

The mechanical properties of jointed rock masses are critical to structural stability and durability. Advances in 3D printing and numerical simulations have facilitated innovative studies on their deformation and mechanical behavior. However, the discontinuous and non-penetrating nature of rock joints presents challenges for predictive modeling. This study presents an computed tomography and synthetic rock mass (CT-SRM) integrated analytical approach to investigate the mechanical properties of non-persistent jointed coal measures, with three notable findings contributions: Firstly, a novel digital reconstruction methodology for joint networks was developed using high-precision CT scanning and 3D reconstruction techniques, achieving accuracy of 96.03%. Secondly, the research has identified the critical joint diameter effect (30 mm) causing 30%-50% strength reduction and observed wing-shaped deformation induced by 30° secondary joints, elucidating a new size-controlled mechanism. Thirdly, quantitative correlation models between joint geometric parameters and macroscopic mechanical properties were established, offering insights for engineering stability assessment. The developed analytical framework offers a reliable solution for stability prediction of jointed rock masses in engineering applications.