An experimental investigation of effects of block shape on the mechanical properties of bimrocks

IF 4.2 2区工程技术 Q3 ENGINEERING, ENVIRONMENTAL

Bulletin of Engineering Geology and the Environment Pub Date : 2025-10-10 DOI:10.1007/s10064-025-04518-2

Kai Li, Shaorui Sun, Jihong Wei, Minyi Zhu, Chunlin Jin, Hu Zheng

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Abstract

The shape of rock blocks significantly influences the mechanical properties of bimrocks. To address this gap in research, a new laboratory-based method was proposed to study the effects of block shape, with detailed production techniques for creating rock blocks of various shapes. Uniaxial compression and direct shear test results revealed that block shape markedly affects the stress-strain behavior under uniaxial compression. The elongation index (EI) and flatness index (FI) were found to effectively characterize the influence of block shape on uniaxial compressive strength (UCS), cohesion, and internal friction angle. Interestingly, when the block proportion was 30% versus 60%, the direction of UCS variation on the EI-FI chart reversed, with EI having a greater influence on UCS than FI. Cohesion increased in a counterclockwise direction on the chart, with the minimum cohesion observed in samples with oblate blocks. In contrast, the internal friction angle increased in a clockwise direction, with its minimum value found in samples with blade-shaped blocks. In terms of shear failure, rock cutting along the shear failure surface decreased with decreasing shape factor (SF), with failure more often manifesting as rock bypassing rather than direct cutting.

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块体形状对双棱岩力学性能影响的实验研究

岩石块体的形状对双侧岩的力学性能有显著影响。为了解决这一研究空白，提出了一种新的基于实验室的方法来研究块体形状的影响，并使用详细的生产技术来创建各种形状的岩石块体。单轴压缩和直剪试验结果表明，块体形状对单轴压缩下的应力-应变行为有显著影响。伸长率指数（EI）和平整度指数（FI）可以有效表征块体形状对单轴抗压强度（UCS）、黏聚力和内摩擦角的影响。有趣的是，当阻断比例为30%和60%时，EI-FI图表上UCS变化的方向相反，EI对UCS的影响大于FI。内聚力在图表上呈逆时针方向增加，在扁圆块的样本中观察到最小的内聚力。而内摩擦角则呈顺时针方向增大，其最小值出现在刀刃状砌块的样品中。在剪切破坏方面，岩石沿剪切破坏面切割量随形状因子（SF）的减小而减小，破坏更多表现为岩石绕道而非直接切割。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Bulletin of Engineering Geology and the Environment 工程技术-地球科学综合

CiteScore

7.10

自引率

11.90%

发文量

445

审稿时长

4.1 months

期刊介绍： Engineering geology is defined in the statutes of the IAEG as the science devoted to the investigation, study and solution of engineering and environmental problems which may arise as the result of the interaction between geology and the works or activities of man, as well as of the prediction of and development of measures for the prevention or remediation of geological hazards. Engineering geology embraces: • the applications/implications of the geomorphology, structural geology, and hydrogeological conditions of geological formations; • the characterisation of the mineralogical, physico-geomechanical, chemical and hydraulic properties of all earth materials involved in construction, resource recovery and environmental change; • the assessment of the mechanical and hydrological behaviour of soil and rock masses; • the prediction of changes to the above properties with time; • the determination of the parameters to be considered in the stability analysis of engineering works and earth masses.