发表机构
University of Alberta（阿尔伯塔大学）
机构由 AI 辅助整理，请以论文原文为准。AI 中文总结
本研究用离散元法模拟不规则岩石碎片，发现静载下破坏力受表面积体积比控制，动载下几何敏感性增强，为无标准岩芯时的力学测量解释提供定量框架。
AI 中文摘要
地下岩层的力学表征通常需要标准圆柱形岩芯样本，而这些样本在裂缝性或非常规储层序列中往往无法获取。本研究采用校准自硫磺山组粉砂岩的离散元方法（DEM）框架，探究碎片几何形状如何控制不规则岩石颗粒（可直接类比于钻屑）的力学响应。对19个样本（18个程序生成的不规则几何体及1个参考巴西圆盘），归一化至10毫米外接球半径，在准静态（巴西型）和动态（短冲击载荷单元）加载模式下进行测试。将四个力学输出量——破坏力（Ff）、表观强度（σf）、表观刚度（Ka）和刚度（E）——与七个保留的形状描述符进行回归分析。结果表明，在静态加载下，基于力的量受表面积与体积比（SA/V）强烈控制（调整后R²=0.69），而面积归一化量（σf和E）对几何形状不敏感。动态加载增强了破坏力的几何敏感性，并引入了表面凹度深度的独立作用。这些发现为在缺乏标准岩芯时解释不规则岩石碎片的力学测量结果建立了初步的定量框架。
英文摘要
Mechanical characterization of subsurface rock formations typically requires standardized cylindrical core specimens, which are often unavailable from fractured or unconventional reservoir sequences. This study uses a Discrete Element Method (DEM) framework calibrated to Sulphur Mountain Formation siltstone to investigate how fragment geometry governs mechanical response in irregular rock particles, which are direct analogues of drill cuttings. Nineteen specimens (18 procedurally generated irregular geometries and one reference Brazilian disk), normalized to a 10 mm bounding sphere radius, were tested under quasi-static (Brazilian-type) and dynamic (Short Impact Load Cell) loading modes. Four mechanical outputs of failure force (Ff), apparent strength (σf), apparent stiffness (Ka), and stiffness (E) were regressed against seven retained shape descriptors. Results show that force-based quantities are strongly controlled by the surface-area-to-volume (SA/V) ratio under static loading (Adj. R2 = 0.69), while area-normalized quantities (σf and E) are geometrically insensitive. Dynamic loading amplifies geometric sensitivity for failure force and introduces an independent role for surface concavity depth. These findings establish a preliminary quantitative framework for interpreting mechanical measurements from irregular rock fragments when a standardized core is unavailable.
Comments8 pages, 7 Figures, 2 Tables, submitted and presented at GeoQuebec2026
