单轴压缩下含双圆孔类岩石材料破坏机理研究

打开文本图片集

中图分类号：TU45 文献标志码：A 文章编号：1000-4939（2025）06-1364-11

Abstract：To study the effct of double circular holes on the mechanical properties of rocks and the crack extension process，a uniaxial compresson model for rock specimens containing double circular holes was constructed，and the correctness and rationality of the numerical model were verified based on the comparison of the macroscopic mechanical parameters obtained from experiments and simulations.In addition，the crack extension process of specimens containing double circular holes and the evolution of the stress field around the circular holes were analyzed.The results show that the numerical simulation results are in good agreement with the experimental results；the initial tensile crack first sprouts at the upper and lower ends of the circular hole，and with the increase of axial stress，structural weak zones are usually formed at the leftand right sides of the holewall.The sprouting direction of the initial tensile crack is in the axial loading direction，independent of the orientation angle α ，but the damage pattern of the specimen is influenced by the orientation angle α . The initial tensile crack is generated in the tensile stress concentration area; the tensile stress concentration area at the upper and lower ends of the circular hole moves and disipates accordingly with the expansion of the initial tensile crack.The compressive stress concentration area of the stress component σyy is located on the left and right sides of the circular hole，while a shielding area of compressive stress is formed at the upper and lower ends of the circular hole，and the smaler the distance from the vertical center line of the circular hole，the stronger the shielding effct and the weaker the compressive stress.

Key words：rock mechanics ; bicircular hole； single-axis compression ; granular flow procedure; crack extension；stress field

自然界中广泛存在的岩石是隧道、地下空间和水利水电等工程的重要媒介。（剩余18176字）