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Dynamic Mechanical Properties and Damage Constitutive Model of Copper-bearing Garnet-biotite Schist
- Acta Armamentarii Vol. 44, Issue 12, Pages: 3805-3814(2023)
- 作者机构：
昆明理工大学 国土资源工程学院, 云南 昆明 650093
- 作者简介：
- 基金信息：
DOI：10.12382/bgxb.2023.0690
CLC：Received：25 July 2023，
Published Online：12 January 2024，
Published：30 December 2023
- 稿件说明：
移动端阅览
Zehu ZHAO, Xianglong LI, Qiwen HU, et al. Dynamic Mechanical Properties and Damage Constitutive Model of Copper-bearing Garnet-biotite Schist[J]. Acta Armamentarii, 2023, 44(12): 3805-3814.
Zehu ZHAO, Xianglong LI, Qiwen HU, et al. Dynamic Mechanical Properties and Damage Constitutive Model of Copper-bearing Garnet-biotite Schist[J]. Acta Armamentarii, 2023, 44(12): 3805-3814. DOI： 10.12382/bgxb.2023.0690.
摘要
为探究深部矿岩在不同加载条件下的动态力学特性及损伤规律
以深部回采的含铜石榴黑云片岩为对象
开展6种轴压
σ
ap
(0MPa、6MPa、12MPa、18MPa、24MPa、30MPa)、6种围压
σ
p
(0MPa、4MPa、8MPa、12MPa、16MPa、20MPa)及6种冲击速度
v
(18.68m/s、20.9m/s、23.54m/s、26.63m/s、29.26m/s、31.95m/s)条件下的动静组合冲击试验
并考虑冲击速度、轴压、围压及应变率因素
基于统计损伤理论和Drucker-Prager破坏准则建立动静组合加载下含铜石榴黑云片岩的动态损伤本构模型。研究结果表明:矿岩试件的应力-应变曲线几乎无压密阶段
当应力增加至峰值应力的
65%~80%时
该阶段的应力-应变曲线出现阶跃现象;不同埋深矿岩的受力状态和冲击速度显著影响了深部围岩的动态破坏模式
当
σ
p
=12MPa、
v
=31.95m/s时
随着轴压
σ
ap
的增加
动态抗压强度先增加、后降低
而峰值应变线性递减
当
σ
p
=12MPa、
σ
ap
=24MPa时
动态抗压强度随应变率的增大线性增加
而峰值应变随应变率的增加呈二次多项式增长;模型理论曲线与试验曲线吻合度均较高
验证了该动态本构模型的可靠性
可为深埋岩体动态本构模型研究及工程应用提供一定的参考。
Abstract
The dynamic mechanical properties and damage law of deep ore rock under different loading conditions are explored by taking the copper-bearing garnet biotite schist in deep mining as an object of study. A combined dynamic and static impact test is performed under the conditions of six kinds of axial pressure
σ
ap
(0MPa
6MPa
12MPa
18MPa
24MPa
30MPa)
six kinds of confining pressure
σ
p
(0MPa
4MPa
8MPa
12MPa
16MPa
20MPa) and six kinds of impact velocity
v
(18.68m/s
20.93m/s
23.54m/s
26.63m/s
29.26m/s
31.95m/s)
and the factors of impact velocity
axial pressure
confining pressure and strain rate are considered. Based on the statistical damage theory and Drucker-Prager failure criterion
a dynamic damage constitutive model of copper-bearing garnet-biotite schist under combined static and dynamic loading is established. The results show that there is almost no compaction stage in the stress-strain curve of ore rock specimen. When the stress increases to 65%-80% of peak stress
the stress-strain curve of this stage shows a step phenomenon. The dynamic failure mode of deep surrounding rock is significantly affected by the stress state and impact velocity of ore rock at different buried depths.When
σ
p
=12MPa and
v
=31.95m/s
the dynamic compressive strength increases first and then decreases with the increase of axial compression
σ
ap
while the peak strain decreases linearly. When
σ
p
=12MPa and
σ
ap
=24MPa
the dynamic compressive strength increases linearly with the increase of strain rate
while the peak strain increases as quadratic polynomial with the increase of strain rate. The theoretical curve of the model is in good agreement with the experimental curve
which verifies the reliability of the dynamic constitutive model
and can provide some reference for the research and engineering application of the dynamic constitutive model of deep buried rock mass.
关键词
Keywords
references
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