【摘要】 在单轴加压下进行了有预制裂纹的岩石板在裂纹扩展过程中声发射时b值的实验。发现b值的变化与岩石裂纹的扩展过程有密切关系,并且不同岩石介质的相互作用可影响b值的变化。通常裂纹扩展时,b值下降,但扩展受阻时,b值又有所回升,因此,有预制裂纹的岩石板在破裂过程中,b值呈起伏变化。更多还原

【Abstract】 During the crack propagation process of rock plate with preexisting cracks under uniaxial compression, the acoustic emission b-valus are measured. It is found that the variation of b-values has a close relation with the crack propagation of rock plate. Besides, the interactions for the different kinds of rock media also effect the b-values. In general, when cracks are growing, the b-value down has been observed; when the propagation is restrained, and the b-value are increasing. The values of b change in the form of wave during the fracturing process of rock plate with preexisting cracks.更多还原