循环荷载下煤岩弹塑性损伤的能量机制分析

doi:10.16265/j.cnki.issn1003-3033.2020.05.014

中国安全科学学报 ›› 2020, Vol. 30 ›› Issue (5): 88-94.doi: 10.16265/j.cnki.issn1003-3033.2020.05.014

循环荷载下煤岩弹塑性损伤的能量机制分析

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

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.贵州省非金属矿产资源综合利用重点实验室,贵州贵阳 550025;
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:2020-02-13 修回日期:2020-04-14 出版日期:2020-05-28 发布日期:2021-01-28
通讯作者: **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。
作者简介:张尧(1995—),男,贵州惠水人,硕士研究生,研究方向为岩石损伤力学与瓦斯渗流。E-mail:15180794590@163.com。
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)。

Energy mechanism analysis on elastoplastic damage of coal under cyclic loading

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

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. Key Laboratory of Nonmetallic Minerals Utilization of Guizhou Province, Guiyang Guizhou 550025,China;
4. State Key Laboratory of Coal Mine Disaster Dynamics and Control, Chongqing University, Chongqing 400044, China

Received:2020-02-13 Revised:2020-04-14 Online:2020-05-28 Published:2021-01-28

摘要/Abstract

摘要： 为探究采动应力周期性扰动下煤岩的损伤变形及能量演化机制,利用含瓦斯煤热-流-固耦合三轴伺服渗流试验装置,开展不同稳定时间下煤岩三轴循环荷载试验;基于能量参数分析,推导出循环荷载作用下煤岩弹塑性损伤变量计算公式,分析煤岩弹塑性损伤演化行为。研究结果表明:不同稳定时间下煤岩主应力差-轴向应变曲线呈现周期性滞回环演化趋势,在稳定时间和外部荷载下弹性模量并没有随循环次数的增大而减小,煤岩损伤机制发生变化;煤岩吸收的总能量U与耗散能U^d随循环次数的增加总体变化趋势为L型,弹性能U^e逐渐减小而后趋于稳定;基于能量计算的煤岩弹塑性损伤变量值在30次循环荷载过程中,均在一稳定值附近呈波动性稳定变化趋势。

关键词: 煤岩, 循环荷载, 能量, 不可逆塑性应变, 弹塑性损伤

Abstract: In order to explore damage deformation and energy evolution mechanism of coal under periodic disturbance of stress, cyclic loading tests with different time lengths of stabilization were carried out by using servo-controlled triaxial seepage device for thermo-fluid-solid coupling of coal containing methane. Then, based on analyses of energy parameters, a calculation formula of damage variables of coal under cyclic loading was derived, and evolution behaviors of its elastoplastic damage were analyzed. The experimental results show that the principal stress difference-axial strain curves of coal under different stability time conditions present a periodic hysteresis loop trend, elastic modulus do not decrease with the increase of cycle numbers under stability time and external load, and damage mechanism changes. The total energy absorbed U and dissipative energy U^d change with the increase of cycle numbers in an overall trend of L, and elastic strain U^e is gradually reduced and tends to be stable. In the process of 30 cyclic loads, elastoplastic damage variables of coal based on energy calculation show a tendency of fluctuating and stable changes around a stable value.

Key words: coal, cyclic loading, energy, irreversible plastic strain, elastoplastic damage

中图分类号:

X936

张尧, 李波波, 任崇鸿, 许江, 李建华. 循环荷载下煤岩弹塑性损伤的能量机制分析[J]. 中国安全科学学报, 2020, 30(5): 88-94.

ZHANG Yao, LI Bobo, REN Chonghong, XU Jiang, LI Jianhua. Energy mechanism analysis on elastoplastic damage of coal under cyclic loading[J]. China Safety Science Journal, 2020, 30(5): 88-94.

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循环荷载下煤岩弹塑性损伤的能量机制分析

Energy mechanism analysis on elastoplastic damage of coal under cyclic loading

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