中南大学学报（自然科学版）2025，Vol.56Issue(4)：1440-1453,14.DOI:10.11817/j.issn.1672-7207.2025.04.016
含倾角岩充组合体动态力学破坏特性数值模拟研究
Numerical investigation on dynamic mechanical failure properties of rock-backfill composite with inclined angle
摘要
Abstract
To investigate the mechanical response characteristics of rock-backfill composite with inclined angle under one-dimensional coupled static-dynamic load,impact compression tests were conducted for composites composed of bonded granite monomers and backfill monomers using the finite element software LS-DYNA.The failure patterns and damage characteristics of rock-backfill composites with different inclined interface angles(0°,15°,30°,45°)at various impact velocities(6,7,8,9 m/s)and under different axial pressures(0,0.58,1.16,1.74 MPa)were analyzed.Additionally,the reflection and transmission laws of stress waves in rock-backfill composites with different inclined interface angles were explored based on the theory of elastic waves.The results indicate that the instability failure of rock-backfill composite primarily occurs in the backfill.Under the same impact velocity and axial pressure,as the inclined interface angle increases,the crack initiation zone gradually shifts from the end of the backfill to the side of the backfill adjacent to the interface.Correspondingly,the dominant failure mode transitions from tensile failure to shear failure.The stress wave propagation is closely related to the inclined interface angle.As the inclined interface angle increases from 0° to 45°,the transmission coefficient of the stress wave tends to decrease.The damage characteristics of the composite are quantitatively assessed by the proportion of failed elements in the backfill.It is found that the damage of the composite is negatively correlated with the inclined interface angle,but positively correlated with the impact velocity and axial pressure.关键词
岩充组合体/动静组合/破坏形态/损伤特征Key words
rock-backfill composite/coupled static-dynamic loading/failure pattern/damage characteristic分类
建筑与水利引用本文复制引用
刘志伟,刘志祥,马泗洲,袁丛祥,郭灿,张双侠..含倾角岩充组合体动态力学破坏特性数值模拟研究[J].中南大学学报（自然科学版）,2025,56(4):1440-1453,14.基金项目
国家重点研发计划项目(2022YFC2904101) （2022YFC2904101）
国家自然科学基金资助项目(52374107) （52374107）
中南大学研究生创新项目(2024ZZTS0651)(Project(2022YFC2904101)supported by the National Key Research and Development Program of China （2024ZZTS0651）
Project(52374107)supported by the National Natural Science Foundation of China （52374107）
Project(2024ZZTS0651)supported by the Innovation Program of Central South University) （2024ZZTS0651）
