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对含45°预制裂纹的花岗岩板进行单轴压缩实验,对比分析翼形裂纹和二次裂纹的表面电位,从而分析研究不同受力状态裂纹开裂扩展过程中表面电位的差异性。研究结果表明:当压剪作用产生的二次裂纹呈现为1条破碎带时,压剪作用产生的二次裂纹的表面电位比张拉应力产生的翼形裂纹的表面电位更加复杂;当压剪作用产生的二次裂纹也呈现为单一裂纹时,2种受力状态产生的裂纹的表面电位在变化趋势上没有明显的差异性;裂纹开裂扩展过程中表面电位的复杂程度与裂纹产生时的受力状态没有直接关系,而是与裂纹形态有直接关系。
The uniaxial compression tests were carried out on the granite slabs containing 45 ° prefabricated cracks to compare the surface potentials of the airfoils and the secondary cracks. The differences of surface potentials during crack propagation were analyzed. The results show that the surface potential of the secondary cracks produced by the compression-shear effect is more complicated than the surface potential of the wing-shaped cracks generated by the tensile stress when the secondary cracks produced by the compression-shear effect appear as a single broken belt. When the secondary cracks also appear as a single crack, the surface potentials of the cracks produced by the two kinds of stress states have no significant difference in the trend of change. The complexity of the surface potential during the crack propagation and the influence Force status is not directly related, but has a direct relationship with the crack morphology.