【摘要】 采用3D打印技术制备了含有不同倾角和粗糙度节理的类岩石试样，并对其进行真三轴压缩加载力学试验。研究结果表明：节理面粗糙度的增加导致节理岩体轴向强度和峰值应变的增加；随着倾角的增大，轴向强度呈现先降低(30°～60°)后增大(60°～90°)的变化趋势，峰值应变则呈现先增大(30°～45°)后降低(45°～90°)的变化趋势。不同走向下节理所受侧向应力的差异导致了破坏模式的变化。节理走向与中间主应力平行的试样主要表现为基质剪切或基质–节理混合剪切破坏，而节理走向与最小主应力方平行的试样则主要发生基质剪切破坏。声发射信号分析结果表明，裂纹数量和剪切裂纹百分比随粗糙度的增大而增大，随倾角的增大先减小(30°～60°)后增大(60°～90°)。研究结果可为节理围岩地下工程的设计与支护提供指导。更多还原

【Abstract】 Rock-like specimens containing a joint with different inclination angles and roughness were prepared using 3D printing technology. Then, true triaxial compression loading experiments were conducted on those jointed specimens. The increase in roughness leads to an increase in the axial strength and peak strain. With the increasing inclination angle, the axial strength initially decreases from 30° to 60° and then increases from 60° to 90°. While the peak strain first rises from 30° to 45° and then declines from 45° to 90°. The variation in failure mode results from differences in lateral stress on the joints under different strike directions. Specimens with joint strike parallel to the intermediate principal stress predominantly showed matrix or matrix-joint mixed shear failure, whereas those parallel to the minimum principal stress exhibited matrix shear failure. The analysis results of acoustic emission signals indicate the crack number and shear crack percentage increase with the increasing roughness and first decrease(30° to 60°), then increase(60° to 90°) with the increasing inclination angle. The research results can provide some guidance for the design and support of underground engineering with jointed surrounding rock.更多还原