三轴应力下煤岩损伤-能量演化特征研究

doi:10.16265/j.cnki.issn1003-3033.2019.10.015

中国安全科学学报 ›› 2019, Vol. 29 ›› Issue (10): 98-104.doi: 10.16265/j.cnki.issn1003-3033.2019.10.015

三轴应力下煤岩损伤-能量演化特征研究

李波波^1,2,3 副教授, 张尧¹, 任崇鸿¹, 杨康¹, 李建华¹, 许江⁴ 教授

1 贵州大学矿业学院,贵州贵阳 550025;
2 贵州大学喀斯特山区优势矿产资源高效利用国家地方联合工程实验室,贵州贵阳 550025;
3 山东科技大学矿山灾害预防控制省部共建国家重点实验室培育基地,山东青岛 266590;
4 重庆大学煤矿灾害动力学与控制国家重点实验室,重庆 400044

收稿日期:2019-07-12 修回日期:2019-09-13 出版日期:2019-10-28 发布日期:2020-10-27
作者简介:李波波 (1985—),男,贵州修文人,博士,副教授,主要从事岩石力学与工程、矿井灾害防治等方面的教学与研究工作。E-mail: bbli@gzu.edu.cn。
基金资助:
国家自然科学基金资助(51804085,51911530203);贵州省科技计划项目(黔科合平台人才[2018]5781号)。

Study on damage-energy evolution characteristics of coal under triaxial stress

LI Bobo^1,2,3, ZHANG Yao¹, REN Chonghong¹, YANG Kang¹, LI Jianhua¹, XU Jiang⁴

1 College of Mining, Guizhou University, Guiyang Guizhou 550025, China;
2 National Local Joint Engineering Laboratory for Efficient Utilization of Dominant Mineral Resources in Karst Mountain Area, Guizhou University, Guiyang Guizhou 550025, China;
3 State Key Laboratory of Mining Disaster Prevention and Control Co-founded by Shandong Province and the Ministry of Science and Technology, Shandong University of Science and Technology, Qingdao Shandong 266590, China;
4 State Key Laboratory of Coal Mine Disaster Dynamics and Control, Chongqing University, Chongqing 400044, China

Received:2019-07-12 Revised:2019-09-13 Online:2019-10-28 Published:2020-10-27

摘要/Abstract

摘要： 为有效预防煤岩动力灾害,利用含瓦斯煤热-流-固耦合三轴伺服渗流试验装置对煤岩进行三轴压缩试验,研究三轴应力下煤岩的变形破坏特征及损伤过程中的能量演化机制;建立煤岩损伤本构模型;构建损伤-能量耦合数学表达式。结果表明:不同围压下煤岩偏应力-应变曲线的变化趋势基本一致;煤岩在变形破坏过程中,能量转换形式随变形破坏规律呈现阶段性变化;围压对煤岩的能耗特征有较大的影响,煤岩吸收的总能量、弹性能、耗散能的增长速率均随围压的增大而增大,且在峰值偏应力点处,随着围压的增大,临界破坏点总能量、储能极限、临界破坏点耗散能线性增大;能量耗散是造成煤岩内部结构产生损伤的主要原因,耗散能随损伤变量的增大总体上呈S型变化。

关键词: 三轴应力, 煤岩损伤, 力学特性, 本构模型, 能量特征

Abstract: In order to prevent coal dynamic disasters effectively, triaxial servo-controlled seepage equipment of thermo-fluid-solid coupling was used for a triaxial compression test of coal to study its deformation and failure characteristics under triaxial stress and mechanism of energy evolution in process of damage. Then, a constitutive model of coal damage was established and mathematical expression of damage-energy coupling was constructed. The experimental results show that change trend of partial stress-strain curve of coal under different confining pressure is basically consistent. Its energy conversion form shows a periodic change in accordance with deformation and failure rules. Confining pressure has a great influence on energy consumption characteristics, since as it increases, the growth rate of total energy absorbed by coal, elastic performance and dissipation energy will also increase, and at peak partial stress point, with its increase, total energy, storage limit and dissipation energy of critical failure point would increase linearly. Energy dissipation is the main cause of damage to internal structure of coal, and it will change in an S type with an increase of damage variables.

Key words: triaxial stress, coal damage, mechanical characteristics, constitutive model, energy characteristics

中图分类号:

X936

李波波, 张尧, 任崇鸿, 杨康, 李建华, 许江. 三轴应力下煤岩损伤-能量演化特征研究[J]. 中国安全科学学报, 2019, 29(10): 98-104.

LI Bobo, ZHANG Yao, REN Chonghong, YANG Kang, LI Jianhua, XU Jiang. Study on damage-energy evolution characteristics of coal under triaxial stress[J]. China Safety Science Journal, 2019, 29(10): 98-104.

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三轴应力下煤岩损伤-能量演化特征研究

Study on damage-energy evolution characteristics of coal under triaxial stress

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