Numerical Investigation on the Influence of Rock Block Gradation on the Mechanical Behavior of Bimrocks

IF 3.6 2区工程技术 Q2 ENGINEERING, GEOLOGICAL

International Journal for Numerical and Analytical Methods in Geomechanics Pub Date : 2026-08-06 Epub Date: 2026-06-12 DOI:10.1002/nag.70367

Hu Zheng, Tianming Lu, Kai Li, Minyi Zhu, Shaorui Sun, Jihong Wei, Yu Huang

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引用次数: 0

Abstract

Differences in block gradation are common in bimrocks and exert a significant influence on their mechanical behavior. This study employs the 3D discrete element method to investigate the effects of block gradation in specimens with volumetric block proportions (VBPs) between 30% and 60%. In addition, the roles of block shape and block distribution in modulating the influence of block gradation are examined. Results indicate that at 30% VBP, block gradation primarily affects the peak strength and corresponding strain of specimens. When VBP ranges from 40% to 60%, its influence on peak strength becomes more irregular; however, the elastic modulus is lower in specimens with a higher proportion of small blocks. Such specimens are also more prone to through-going failure, whereas those containing larger blocks tend to exhibit localized failure. Specimens with ellipsoidal blocks are more susceptible to through-going failure, as block shape strongly affects fracturing within the matrix, at matrix–block interfaces, and within the blocks themselves. Block distribution exerts the greatest influence when the proportions of blocks of different sizes are relatively balanced.

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砌块级配对双侧岩力学性能影响的数值研究

块体级配的差异在双相岩中很常见，并对其力学行为产生重大影响。本研究采用三维离散元方法，对体积块比（VBPs）在30% ~ 60%之间的试件进行块级配研究。此外，还研究了块体形状和块体分布对块体级配影响的调节作用。结果表明，在30% VBP时，砌块级配主要影响试件的峰值强度和相应的应变。VBP在40% ~ 60%范围内，对峰值强度的影响更加不规则；而小块体比例越高，试件的弹性模量越低。这样的试件也更容易发生贯通破坏，而那些包含较大块体的试件则倾向于表现出局部破坏。椭球状块体的试样更容易发生贯通破坏，因为块体形状强烈影响基质内部、基质-块体界面以及块体内部的破裂。当不同大小块的比例相对平衡时，块分布的影响最大。

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来源期刊

International Journal for Numerical and Analytical Methods in Geomechanics 工程技术-材料科学：综合

CiteScore

6.40

自引率

12.50%

发文量

160

审稿时长

9 months

期刊介绍： The journal welcomes manuscripts that substantially contribute to the understanding of the complex mechanical behaviour of geomaterials (soils, rocks, concrete, ice, snow, and powders), through innovative experimental techniques, and/or through the development of novel numerical or hybrid experimental/numerical modelling concepts in geomechanics. Topics of interest include instabilities and localization, interface and surface phenomena, fracture and failure, multi-physics and other time-dependent phenomena, micromechanics and multi-scale methods, and inverse analysis and stochastic methods. Papers related to energy and environmental issues are particularly welcome. The illustration of the proposed methods and techniques to engineering problems is encouraged. However, manuscripts dealing with applications of existing methods, or proposing incremental improvements to existing methods – in particular marginal extensions of existing analytical solutions or numerical methods – will not be considered for review.