Effect of multiscale interface roughness on shear behavior of backfill-rock specimen

IF 7.5 1区 工程技术 Q1 ENGINEERING, GEOLOGICAL
Wenkai Ru, Diyuan Li, Zhenyu Han, Hao Gong, Jinyin Ma
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Abstract

This research explores how the multiscale morphological features of stope-surrounding rock influence the stability of backfill materials. A laboratory-scale rough interface was generated from morphological data and analysed using wavelet decomposition to extract its multiscale characteristics. Statistical analyses were conducted to quantify the correlation between interface roughness and scale under direct shear conditions. 3D carving technology was employed to construct a backfill-rock specimen containing the initial rough surface, which was subjected to direct shear tests. Additionally, a calibrated numerical model based on the Discrete Element Method (DEM) was developed to simulate the shear behavior under varying conditions. The results indicated that the alteration in the scale of the rough surface did not influence its waviness. However, it modified the higher-order irregularities. Removing high-order unevenness reduced the roughness and effective contact area of the surface, leading to a decrease in both peak and residual shear stresses of the backfill-rock specimen. The reduction in shear stress corresponded to a reduction in the contact force of the shear force chain and a decrease in backfill attachment to the shear fracture surface. This study is the first to demonstrate the critical role of rough surface scale characteristics in determining the shear strength of backfill-rock interfaces. The findings provide valuable insights into the shear behavior of the backfill-surrounding rock interface in backfill mining, contributing to the long-term stability of the backfill.
多尺度界面粗糙度对回填岩体试件剪切特性的影响
研究了采场围岩多尺度形态特征对充填体稳定性的影响。利用形态学数据生成实验室尺度的粗糙界面,利用小波分解提取其多尺度特征。通过统计分析,量化了直接剪切条件下界面粗糙度与尺度之间的相关性。采用三维雕刻技术构建含初始粗糙面回填岩样,进行直剪试验。此外,建立了基于离散元法(DEM)的校准数值模型,模拟了不同条件下的剪切行为。结果表明,粗糙表面的尺度变化对其波纹度没有影响。然而,它修正了高阶不规则性。消除高阶不均匀降低了表面粗糙度和有效接触面积,从而降低了回填岩样的峰值剪应力和残余剪应力。剪切应力的减小对应着剪切力链接触力的减小和充填体对剪切断裂面附着的减小。该研究首次证明了粗糙表面尺度特征在决定回填-岩石界面抗剪强度方面的关键作用。研究结果为研究充填采矿中充填体-围岩界面剪切特性提供了有价值的见解,有助于充填体的长期稳定性。
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来源期刊
CiteScore
14.00
自引率
5.60%
发文量
196
审稿时长
18 weeks
期刊介绍: The International Journal of Rock Mechanics and Mining Sciences focuses on original research, new developments, site measurements, and case studies within the fields of rock mechanics and rock engineering. Serving as an international platform, it showcases high-quality papers addressing rock mechanics and the application of its principles and techniques in mining and civil engineering projects situated on or within rock masses. These projects encompass a wide range, including slopes, open-pit mines, quarries, shafts, tunnels, caverns, underground mines, metro systems, dams, hydro-electric stations, geothermal energy, petroleum engineering, and radioactive waste disposal. The journal welcomes submissions on various topics, with particular interest in theoretical advancements, analytical and numerical methods, rock testing, site investigation, and case studies.
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