瓦斯气体劣化-荷载作用下煤岩损伤本构模型*

doi:10.16265/j.cnki.issn 1003-3033.2021.07.011

中国安全科学学报 ›› 2021, Vol. 31 ›› Issue (7): 76-81.doi: 10.16265/j.cnki.issn 1003-3033.2021.07.011

瓦斯气体劣化-荷载作用下煤岩损伤本构模型^*

李波波^1,2,3 教授, 吴学海¹, 任崇鸿¹, 许江⁴ 教授, 张尧¹, 高政¹

1 贵州大学矿业学院,贵州贵阳 550025;
2 贵州大学喀斯特地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:2021-04-20 修回日期:2021-06-10 出版日期:2021-07-28 发布日期:2022-01-28
作者简介:李波波 (1985—),男,贵州修文人,博士,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(52064007,51804085,51911530203);贵州省科技计划项目(黔科合基础-ZK[2021]重点052)。

Constitutive model of coal damage under gas degradation and load

LI Bobo^1,2,3, WU Xuehai¹, REN Chonghong¹, XU Jiang⁴, ZHANG Yao¹, GAO Zheng¹

1 College of Mining, Guizhou University, Guiyang Guizhou 550025, China;
2 National Joint Engineering Laboratory for Utilization of Dominant Mineral Resources in Karst Area, Guizhou University, Guiyang Guizhou 550025, China;
3 Guizhou Key Laboratory of Comprehensive Utilization of Non-metallic Mineral Resources, Guiyang Guizhou 550025, China;
4 State Key Laboratory of Coal Mine Disaster Dynamics and Control, Chongqing University,Chongqing 400044, China

Received:2021-04-20 Revised:2021-06-10 Online:2021-07-28 Published:2022-01-28

摘要/Abstract

摘要： 为有效预防煤矿瓦斯动力灾害,研究瓦斯气体对煤岩力学性质的劣化机制及煤岩损伤演化特征,以原煤试样为研究对象,利用含瓦斯煤热-流-固耦合三轴伺服渗流试验装置,开展不同瓦斯压力下煤岩三轴压缩试验;建立瓦斯气体劣化-荷载作用下煤岩损伤本构模型,通过试验结果验证该模型的合理性。结果表明:煤岩在塑性变形阶段前累计损伤几乎为0,峰后损伤程度迅速增大;随着瓦斯压力升高,煤岩峰值强度与弹性模量均降低,瓦斯气体作用后煤岩初始损伤量显著增加;煤岩黏聚力随瓦斯压力升高而呈线性降低,通过黏聚力与瓦斯压力的关系修正Mohr-Coulomb准则,可量化考虑瓦斯气体劣化后的煤岩应力应变关系;所建模型与试验结果吻合度较高,可反映不同瓦斯压力作用下煤岩损伤演化过程。

关键词: 瓦斯气体, 劣化-荷载, 煤岩损伤, 本构模型, 黏聚力, Mohr-Coulomb准则

Abstract: In order to effectively prevent coal mine gas power disaster, it is necessary to study mechanism of gas degradation of coal and evolution characteristic of coal damage. Raw coal sample was taked as research object, triaxial compression test of coal under different gas pressures was carried out by using triaxial servo-controlled seepage equipment for thermo-fluid-solid coupling of coal containing methane. Damage constitutive model of coal under action of gas degradation and load was established, and rationality of model was verified by test results. The results show that cumulative damage of coal is almost 0 before plastic deformation stage, and damage degree increases rapidly after peak.With the increase of gas pressure, peak strength and elastic modulus of coal are both decrease, initial damage of coal increases significantly after gas action. Cohesiveness of coal decreases linearly with the increase of gas pressure. Mohr-Coulomb criterion is modified through relationship between cohesion and gas pressure, and stress-strain relationship of coal considering gas deterioration is quantified. It has a high degree of agreement with test results, which can well reflect damage evolution process of coal under different gas pressures.

Key words: gas, degradation-load, coal damage, constitutive model, cohesion, Mohr-Coulomb criterion

中图分类号:

X936

李波波, 吴学海, 任崇鸿, 许江, 张尧, 高政. 瓦斯气体劣化-荷载作用下煤岩损伤本构模型^*[J]. 中国安全科学学报, 2021, 31(7): 76-81.

LI Bobo, WU Xuehai, REN Chonghong, XU Jiang, ZHANG Yao, GAO Zheng. Constitutive model of coal damage under gas degradation and load[J]. China Safety Science Journal, 2021, 31(7): 76-81.

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瓦斯气体劣化-荷载作用下煤岩损伤本构模型^*

Constitutive model of coal damage under gas degradation and load

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