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选用砂岩作为试验材料,进行不同倾斜角度单预制裂纹的单轴压缩试验研究,透过裂纹扩展量测技术以及配合相关断裂准则,得到:(1)理论与实验的裂纹起裂角随裂纹倾斜角增加而增大;(2)透过相关断裂准则,砂岩试件在裂纹尖端产生反翼裂纹是因为剪力破坏;(3)在单轴压缩作用下砂岩试件裂纹扩展受单裂纹的倾斜角影响,当裂纹倾斜角较小时,裂纹不易起裂;当裂纹倾斜角较大时,裂纹起裂比较容易;(4)在单轴压缩作用下砂岩试件则受单预制裂纹的倾斜角影响,当裂纹倾斜角较小时,裂纹扩展属于非稳定扩展;当裂纹倾斜角较大时,裂纹扩展属于稳定扩展;(5)在单轴压缩作用下砂岩试件裂纹尖端A侧与裂纹尖端B侧的裂纹扩展平均速度随裂纹倾斜角增加而降低。
Sandstone was chosen as the test material to study the uniaxial compression test of single prefabricated cracks with different tilting angles. Through the crack growth measuring technique and the relevant fracture criterion, we get: (1) Theoretical and experimental crack initiation angles vary with crack inclination angle (2) Through the relevant fracture criterion, the anti-wing crack at the crack tip of the sandstone specimen is caused by shear failure; (3) The crack propagation of the sandstone specimen under the uniaxial compression is affected by the inclination angle of the single crack The cracks are not easy to crack when the inclination angle is small; the crack initiation is easier when the crack angle is larger; (4) Under the uniaxial compression, the sandstone specimen is affected by the tilt angle of single prefabricated cracks, When the crack angle is small, the crack propagation is unstable. When the crack angle is large, the crack propagation is stable. (5) Under uniaxial compression, the crack tip side A and the crack tip B side The average crack growth rate decreases with the increase of the crack angle.