含铜石榴黑云片岩动态力学特性及损伤本构模型

赵泽虎; 李祥龙; 胡启文; 王建国

doi:10.12382/bgxb.2023.0690

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含铜石榴黑云片岩动态力学特性及损伤本构模型

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- 含铜石榴黑云片岩动态力学特性及损伤本构模型
- Dynamic Mechanical Properties and Damage Constitutive Model of Copper-bearing Garnet-biotite Schist
- 兵工学报 2023年44卷第12期页码：3805-3814
- 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：
  
  *邮箱: lxl00014002@163.com
- 基金信息：
  
  国家自然科学基金项目(52274083)
- DOI：10.12382/bgxb.2023.0690
  中图分类号：
- 收稿：2023-07-25，
  
  网络出版：2024-01-12，
  
  纸质出版：2023-12-30
- 稿件说明：
移动端阅览
赵泽虎, 李祥龙, 胡启文, 等. 含铜石榴黑云片岩动态力学特性及损伤本构模型[J]. 兵工学报, 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.
赵泽虎, 李祥龙, 胡启文, 等. 含铜石榴黑云片岩动态力学特性及损伤本构模型[J]. 兵工学报, 2023,44(12):3805-3814. DOI： 10.12382/bgxb.2023.0690.

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

(0MPa、6MPa、12MPa、18MPa、24MPa、30MPa)、6种围压

(0MPa、4MPa、8MPa、12MPa、16MPa、20MPa)及6种冲击速度

(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

=12MPa、

=31.95m/s时

随着轴压

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

=12MPa、

=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

(0MPa

6MPa

12MPa

18MPa

24MPa

30MPa)

six kinds of confining pressure

(0MPa

4MPa

8MPa

12MPa

16MPa

20MPa) and six kinds of impact velocity

(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

=12MPa and

=31.95m/s

the dynamic compressive strength increases first and then decreases with the increase of axial compression

while the peak strain decreases linearly. When

=12MPa and

=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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