The mechanical properties of rock-like materials always attract the interest of many researchers. In this paper, we study the influence of specimen cross-section shape on uniaxial compressive strength as well as their deformation, damage and failure characteristics by uniaxial compression tests. The diameter and height of circular cross-section specimens are 50 and 100 mm, respectively, and the height and cross-sectional area of other specimens are equal to that of circular cross-sectional ones. Simulation and experimental results show that the cross-sectional shape has little effect on uniaxial compressive strength. Moreover, the effect on other mechanical properties is also very limited before the peak strength, such as stress–strain curve, rotation and motion of particles, contact damage and energy evolution of particles; however, it gradually becomes obvious after the peak strength. This is a very important feature, which affects the macroscopic form of failure of specimens and reflects the difference between failure surfaces. The shapes of failure surfaces obtained from numerical simulations are quite similar to the experimental results, which verify the reliability of numerical simulation results. Finally, the achievements can serve as a reference for related engineering issues.

中文翻译：

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从宏观和微观角度看横截面形状对类岩石材料在单轴压缩下变形、破坏和破坏的影响

类岩石材料的力学性能一直吸引着许多研究人员的兴趣。在本文中，我们通过单轴压缩试验研究了试件横截面形状对单轴抗压强度及其变形、损伤和破坏特性的影响。圆形截面试件的直径和高度分别为50和100 mm，其他试件的高度和截面积与圆形截面试件相同。仿真和实验结果表明，截面形状对单轴抗压强度影响不大。此外，在峰值强度之前对其他力学性能的影响也非常有限，如应力-应变曲线、粒子的旋转和运动、粒子的接触损伤和能量演化；然而，强度达到顶峰后逐渐明显。这是一个非常重要的特征，它影响试件破坏的宏观形式，反映破坏面的差异。数值模拟得到的破坏面形状与实验结果十分相似，验证了数值模拟结果的可靠性。最后，这些成果可以作为相关工程问题的参考。