含不同倾角单裂隙白砂岩单轴压缩试验研究OA

To investigate the mechanical properties and failure characteristics of white sandstone containing single fissures with different inclination angles,white sandstone from deep coal mines and white sandstone containing fissures with angles of 0°,15°,30°,45°,60°,75°,and 90° were selected as research sub-jects.Uniaxial compression tests were conducted using intact white sandstone specimens as the control group.The results indicate that the fissure inclination angle significantly controls the peak stress,elastic modulus,and failure mode of the specimens.As the inclination angle increases,the peak stress exhibits an S-shaped growth pattern,initially slow and then rapid,ranging from 54%to 98%of the control group.The elastic modulus shows a cubic nonlinear variation,reaching its lowest value(4.17 GPa)at an inclination angle of 15°,which is approximately 48%lower than the control group.The failure mode transitions system-atically with the fissure inclination angle:tensile-dominated wing crack propagation occurs at 0°,15°,30°;tensile-shear composite failure occurs at 45°,60°,75°;and finally,shear-dominated through-type failure occurs at 90°.