充填体–围岩组合体三轴力学行为数值模拟试验分析

卢宏建; 王奕仁; 甘德清; 武婕; 武晓军

doi:10.1007/s12613-022-2554-9

Volume 30 Issue 5

May 2023

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文章导航 > 矿物冶金与材料学报（英文） > 2023 > 30(5): 802-812

Hongjian Lu, Yiren Wang, Deqing Gan, Jie Wu, and Xiaojun Wu, Numerical investigation of the mechanical behavior of the backfill–rock composite structure under triaxial compression, Int. J. Miner. Metall. Mater., 30(2023), No. 5, pp. 802-812. https://doi.org/10.1007/s12613-022-2554-9

Cite this article as:

Hongjian Lu, Yiren Wang, Deqing Gan, Jie Wu, and Xiaojun Wu, Numerical investigation of the mechanical behavior of the backfill–rock composite structure under triaxial compression, Int. J. Miner. Metall. Mater., 30(2023), No. 5, pp. 802-812. https://doi.org/10.1007/s12613-022-2554-9

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研究论文

充填体–围岩组合体三轴力学行为数值模拟试验分析

华北理工大学矿业工程学院，唐山 063210，中国

通讯作者:
卢宏建 E-mail: luhongjian@ncst.edu.cn

文章亮点

（1）构建了基于RFPA^3D的充填体–围岩组合体三轴力学行为数值分析模型。

（2）分析了充填体–围岩组合体三轴应力应变曲线、强度和破坏模式。

（3）揭示了充填体–围岩组合体三轴破坏过程与声发射演化规律。

中文摘要

分析充填体与围岩相互作用机理是地下矿山充填采场稳定性评价关键。以空场嗣后充填采场为物理原型，将充填体与围岩协同考虑，概化出了充填体-围岩组合体实验室尺度模型，基于RFPA^3D构建了具有一个粗糙接触面、两种灰砂配比、四个接触面倾角和三种围压的充填体-围岩组合体三轴压缩试验数值分析模型，系统分析了组合体的三轴应力应变曲线、强度、破坏模式、破坏过程与声发射演化规律，并通过组合体静力学分析模型和文献对比方法验证了结果的可靠性。研究结果表明，充填体-围岩组合体在三轴压缩下的变形、强度特征和破坏模式与接触面倾角、围岩和灰砂配比有关联关系；应力-应变曲线可分为压实、弹性、屈服、应变软化和残余应力五个阶段，不同阶段的声发射特征变化明显；充填体-围岩组合体三轴抗压强度随围压的增加呈线性增加；当接触面倾角为45°和60°时，组合体破坏发生在接触面和充填体区域。当接触面倾角为75°和90°时，充填体、接触面和围岩区域均有破坏。研究结论可为地下充填采场的稳定性分析提供理论依据。

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Research Article

Numerical investigation of the mechanical behavior of the backfill–rock composite structure under triaxial compression

+ Author Affiliations

Abstract

Abstract

To ensure safe and economical backfill mining, the mechanical response of the backfill–rock interaction system needs to be understood. The numerical investigation of the mechanical behavior of backfill–rock composite structure (BRCS) under triaxial compression, which includes deformation, failure patterns, strength characteristics, and acoustic emission (AE) evolution, was proposed. The models used in the tests have one rough interface, two cement–iron tailings ratios (CTRs), four interface angles (IAs), and three confining pressures (CPs). Results showed that the deformation, strength characteristics, and failure patterns of BRCS under triaxial compression depend on IA, CP, and CTR. The stress–strain curves of BRCS under triaxial compression could be divided into five stages, namely, compaction, elasticity, yield, strain softening, and residual stress. The relevant AE counts have corresponding relationships with different stages. The triaxial compressive strengths of composites increase linearly with the increase of the CP. Furthermore, the CP stress strengthening effect occurs. When the IAs are 45° and 60°, the failure areas of composites appear in the interface and backfill. When the IAs are 75° and 90°, the failure areas of composites appear in the backfill, interface, and rock. Moreover, the corresponding failure modes yield the combined shear failure. The research results provide the basis for further understanding of the stability of the BRCS.
- backfill–rock composite structure;
- triaxial compression;
- mechanical behavior;
- acoustic emission;
- numerical simulation

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References(46)

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充填体–围岩组合体三轴力学行为数值模拟试验分析

文章亮点

中文摘要

Numerical investigation of the mechanical behavior of the backfill–rock composite structure under triaxial compression

Abstract

References

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