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在连续体内引入预制裂纹的数学描述,运用近场动力学方法对含有预制裂隙(不同倾角的单裂缝和不同岩桥倾角的三裂缝)的岩石类材料试件的单轴压缩试验进行数值模拟。结果表明,随着裂缝倾角的增加,翼型裂纹出现的位置逐渐向预制裂隙的两端移动,次生共面剪切裂纹与次生倾斜裂纹出现的时间与形态也随之改变;不同倾角的岩桥呈现的断裂贯通形式有着明显的差异,但裂纹均是在预制裂缝尖端首先产生,随后逐渐扩展贯通,最终导致试件的整体失稳破坏。数值模拟与室内试验结果的对比分析表明近场动力学方法可以很好地模拟岩石类材料的裂纹扩展贯通形态,反映裂隙扩展的基本力学机制;作为一种新的非局部数值模型,其在岩石材料与岩体工程数值研究领域具有广阔的应用前景。
The mathematical description of prefabricated cracks was introduced into the continuum. The uniaxial compressive tests of rock specimens with prefabricated fractures (single fractures with different inclinations and three fractures with different rock inclination) were carried out by using near-field dynamic method. The results show that with the increase of the dip angle, the location of the airfoil crack gradually moves toward the two ends of the prefabricated fracture, and the time and shape of secondary coplanar shear cracks and secondary oblique cracks also change. There is a clear difference between the forms of rock breaking through the rock bridge, but the cracks are first produced at the tip of the prefabricated crack, and then gradually expand through, eventually leading to the overall failure of the specimen. Comparative analysis of numerical simulation and laboratory test results show that the near-field dynamic method can well simulate the crack propagation through-rock morphology of rock-like materials and reflect the basic mechanical mechanism of crack propagation. As a new non-local numerical model, Materials and rock engineering numerical research has broad application prospects.