围岩–充填体界面粗糙度表征与剪切错动破坏研究

蔡美峰; 冯志楼; 郭奇峰; 殷雄; 马明辉; 席迅

doi:10.1007/s12613-024-2901-0

Volume 31 Issue 6

Jun. 2024

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文章导航 > 矿物冶金与材料学报（英文） > 2024 > 31(6): 1167-1176

Meifeng Cai, Zhilou Feng, Qifeng Guo, Xiong Yin, Minghui Ma, and Xun Xi, Roughness characterization and shearing dislocation failure for rock–backfill interface, Int. J. Miner. Metall. Mater., 31(2024), No. 6, pp. 1167-1176. https://doi.org/10.1007/s12613-024-2901-0

Cite this article as:

Meifeng Cai, Zhilou Feng, Qifeng Guo, Xiong Yin, Minghui Ma, and Xun Xi, Roughness characterization and shearing dislocation failure for rock–backfill interface, Int. J. Miner. Metall. Mater., 31(2024), No. 6, pp. 1167-1176. https://doi.org/10.1007/s12613-024-2901-0

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研究论文

围岩–充填体界面粗糙度表征与剪切错动破坏研究

1)
北京科技大学金属矿山高效开采与安全教育部重点实验室, 北京 100083, 中国
2)
北京科技大学土木与资源工程学院, 北京 100083, 中国
3)
山东黄金集团, 济南 250102, 中国

通讯作者:
郭奇峰 E-mail: guoqifeng@ustb.edu.cn

文章亮点

(1) 设计了考虑节理形貌粗糙系数的围岩-充填体剪切错动试验方法

(2) 得到了围岩–充填体界面的三维分形维数、剖面线二维分形维数和表面曲率

(3) 揭示了围岩–充填体界面剪切错动力学行为和破坏特征

中文摘要

金属矿充填开采过程中，充填体沉降或采掘扰动作用下，围岩与充填体界面存在剪切错动，影响采场稳定性。本文设计了围岩-充填体剪切错动试验方法，结合数字图像技术与三维激光形貌扫描技术，建立了一套粗糙节理面三维建模流程，基于剪切试验探究了基于自由节理面的围岩-充填体组合体剪切错动力学行为及破坏特征。提出的建模分析方法可获得粗糙面的三维分形维数、剖面线JRC均值、剖面线二维分形维数均值和断裂面表面曲率，通过相关性分析能够实现表面粗糙度的关联表征，进而通过JRC测算剪切强度。试验剪切破坏特征显示：组合体剪切错动有3个破坏阈值点，分别位于峰前段位移30%–50%、峰前段位移70%–90%和峰前段位移100%后，可作为围岩充填体错动破坏判别的征兆；通过围岩表面JRC可判断围岩与充填体剪切错动峰后滑移、均匀变化、阶梯变化的类型，对应工程现场的围岩充填体错动破坏过程类型。该研究揭示了基于自由节理面的异构组合体力学损伤机制，弥补了现有含粗糙节理异构组合体剪切理论体系的不足，为防治矿山充填灾害提供了理论依据。

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Research Article

Roughness characterization and shearing dislocation failure for rock–backfill interface

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Abstract

Abstract

Shearing dislocation is a common failure type for rock–backfill interfaces because of backfill sedimentation and rock strata movement in backfill mining goaf. This paper designed a test method for rock–backfill shearing dislocation. Using digital image technology and three-dimensional (3D) laser morphology scanning techniques, a set of 3D models with rough joint surfaces was established. Further, the mechanical behavior of rock–backfill shearing dislocation was investigated using a direct shear test. The effects of interface roughness on the shear–displacement curve and failure characteristics of rock–backfill specimens were considered. The 3D fractal dimension, profile line joint roughness coefficient (JRC), profile line two-dimensional fractal dimension, and the surface curvature of the fractures were obtained. The correlation characterization of surface roughness was then analyzed, and the shear strength could be measured and calculated using JRC. The results showed the following: there were three failure threshold value points in rock–backfill shearing dislocation: 30%–50% displacement before the peak, 70%–90% displacement before the peak, and 100% displacement before the peak to post-peak, which could be a sign for rock–backfill shearing dislocation failure. The surface JRC could be used to judge the rock–backfill shearing dislocation failure, including post-peak sliding, uniform variations, and gradient change, corresponding to rock–backfill dislocation failure on the field site. The research reveals the damage mechanism for rock–backfill complexes based on the free joint surface, fills the gap of existing shearing theoretical systems for isomerism complexes, and provides a theoretical basis for the prevention and control of possible disasters in backfill mining.
- rock–backfill;
- roughness;
- correlation characterization;
- shearing dislocation;
- interface failure

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