When a rock mass has undergone a long period of geological structural change, various defects such as pores and cracks. Here, the effects of defects on the mechanical properties of a rock mass were investigated. In this research, the strength, deformation and crack evolution behavior of marble containing double elliptic holes under uniaxial compression were evaluated by experiment and numerical simulation. The experimental results show that the dip angle α affects the strength, ultimate failure mode, crack initiation and propagation of marble specimens. As the dip angle increase, crack initiation loci transfer from the elliptic hole surface to the tip. For the ultimate failure mode, the cracks are mainly tensile when α is low, the cracks are mainly shear cracks when α approaches 75°, at 90°, the marble specimen is subject to tensile failure. ANSYS/LS-DYNA was used to simulate the marble specimens containing double elliptic holes, the numerical simulation results show good agreement with the experimental results. Analysis of tensile stress contours in a marble specimen and the different stress states at measuring points. Showed that tensile cracks initiate in the middle of the elliptic hole surface when the dip angle is small, and then the initial position of the tension crack shifts to the tip with increasing dip angle. This is consistent with the experimental findings in which there is no joint crack between the two elliptical holes in the marble specimens when the dip angle is small. A rock bridge fracture appears between the elliptical holes when α is close to 90°.

当岩体经历了长期的地质结构变化时，就会出现各种缺陷，例如孔隙和裂缝。在这里，研究了缺陷对岩体力学性能的影响。在这项研究中，通过实验和数值模拟评估了含双椭圆孔的大理石在单轴压缩下的强度，变形和裂纹扩展行为。实验结果表明，倾角α会影响大理石试样的强度，极限破坏模式，裂纹萌生和扩展。随着倾角的增加，裂纹萌生位点从椭圆孔表面转移到尖端。对于最终的故障模式，裂纹主要是拉伸时α为低时，裂纹主要是剪切裂缝时α接近75°，在90°时，大理石样品会遭受拉伸破坏。用ANSYS / LS-DYNA模拟了含双椭圆孔的大理石标本，数值模拟结果与实验结果吻合良好。分析大理石试样中的拉伸应力轮廓以及测量点处的不同应力状态。结果表明，当倾角较小时，裂纹在椭圆孔表面的中间产生，然后随着倾角的增大，裂纹的初始位置向尖端转移。这与实验结果一致，在该实验结果中，当倾角较小时，大理石样品中的两个椭圆孔之间没有接头裂纹。当α接近90°时，在椭圆孔之间会出现岩桥断裂。