论文部分内容阅读
针对岩石类材料中压剪裂纹的复合断裂问题,理论上一般将其抽象为没有厚度的Griffith线裂纹,这样就会导致翼裂纹初始起裂角与主裂纹方位角及围压无关的结论。而已开展的压剪裂纹复合断裂试验表明,翼裂纹起裂角与主裂纹方位角和围压明显相关。首先较系统地讨论原生(或预制)裂纹的几何特征(如厚度、裂纹尖端曲率半径等)及围压对翼裂纹起裂角的影响;然后结合含预制裂纹大理岩压剪试验进行翼裂纹起裂角的理论预测和试验结果的对比分析。该分析为压剪复合断裂试验提供了一个理论分析框架,也为进一步研究具有复杂几何形状的裂隙提供了一定的理论基础。
Aiming at the composite fracture problem of compressive-shear cracks in rock-like materials, it is theoretically generally abstracted into a Griffith-type crack without thickness, which leads to the conclusion that the initial crack initiation angle is independent of the main crack azimuth and confining pressure. Compression fracture tests have been carried out composite fracture test shows that the wing crack initiation angle and the main crack azimuth and confining pressure were significantly related. Firstly, the geometrical characteristics (such as the thickness, the radius of curvature at the tip of the crack, etc.) of the original (or prefabricated) crack and the influence of the confining pressure on the cracking angle of the wing crack are systematically discussed. Then the crack initiation is carried out in combination with the prestressed cracked marble piecing test Comparative Analysis of Theoretical Prediction and Experimental Results of Cleave Angle. This analysis provides a theoretical analysis framework for the compression-shear test and provides a theoretical basis for further study of fractures with complex geometries.