Wenkai Ru, Diyuan Li, Zhenyu Han, Hao Gong, Jinyin Ma
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引用次数: 0
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.
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.