热冲击对煤岩细观损伤及力学特性影响研究

doi:10.16265/j.cnki.issn 1003-3033.2020.12.012

中国安全科学学报 ›› 2020, Vol. 30 ›› Issue (12): 85-92.doi: 10.16265/j.cnki.issn 1003-3033.2020.12.012

热冲击对煤岩细观损伤及力学特性影响研究

齐消寒^1,2,3 讲师, 马恒^1,2 教授, 王晓琪^1,2, 张遵国^1,2, 吕有厂³

1 辽宁工程技术大学安全科学与工程学院,辽宁葫芦岛 125105;
2 矿山热动力灾害与防治教育部重点实验室,辽宁葫芦岛 125105;
3 中国平煤神马能源化工集团有限责任公司,河南平顶山 467000

收稿日期:2020-09-02 修回日期:2020-11-12 出版日期:2020-12-28
作者简介:齐消寒 (1987—),男,河北石家庄人,博士,讲师,主要从事矿山岩石力学、矿井灾害防治方面的研究。E-mail:qxh871225@126.com。
基金资助:
国家自然科学基金资助(51704147); 辽宁省教育厅青年基金资助 (LJ2017QL002)。

Impacts of thermal shocks on meso-damage and mechanical properties of coal

QI Xiaohan^1,2,3, MA Heng^1,2, WANG Xiaoqi^1,2, ZHANG Zunguo^1,2, LYU Youchang³

1 College of Safety Science and Engineering, Liaoning Technical University, Huludao Liaoning 125105, China;
2 Key Laboratory of Mine Thermo-motive Disaster & Prevention, Ministry of Education, Huludao Liaoning 125105, China;
3 China Pingmei Shenma Energy and Chemical Industry Group Co., Ltd., Pingdingshan Henan 467000, China

Received:2020-09-02 Revised:2020-11-12 Published:2020-12-28

摘要/Abstract

摘要： 为探究不同温度冲击后煤的热损伤与力学性能变化的相关性,以平煤股份十矿深部煤岩为研究对象,利用伺服万能试验系统、高温恒温箱、非金属超声检测仪和4 K科研级测量相机,开展试验,研究不同温度热冲击作用下的煤岩细观损伤演化及力学特征。结果表明:随热冲击温度增加,煤体产生大量细观可见的损伤,煤岩强度随温度升高呈减弱趋势;煤岩端面裂隙网络盒维数D_B可作为定量表征煤岩损伤程度的指标;热冲击温度超过200 ℃,煤样的破坏由弹脆性向延-塑性转变。热冲击冷却后煤岩损伤具有不可恢复性,因此,工程实践中煤层自然发火熄灭后,仍需关注煤层热损伤造成的力学性质的变化。

关键词: 热冲击, 深部煤岩, 细观损伤, 力学特性, 盒维数, 超声波

Abstract: In order to study correlation between thermal damage and mechanical performance of coal after thermal shocks at different temperature, with deep coal of Pingmei No. 10 Mine as a research object, experiment was conducted by using universal testing machine, constant temperature box, ultrasonic detector and 4 K measuring camera. Meso-damage evolution and mechanical characteristics of coal after thermal shock were studied. The results show that as temperature rises, coal body produces a lot of meso-visible damage, and coal strength weakens. Box dimension D_B of fracture network can be used as an index to quantitatively characterize degree of coal damage. When thermal shock temperature exceeds 200 ℃, destruction of coal samples changes from elastic brittleness to ductile-plastic state, and such destruction after thermal shock cooling is irrecoverable. Therefore, attention still needs to be paid to changes in mechanical properties caused by thermal damage after coal seam spontaneously extinguishes in engineering practice.

Key words: thermal shocks, deep coal, meso-damage, mechanical characteristics, box dimension, ultrasonic

中图分类号:

X936

齐消寒, 马恒, 王晓琪, 张遵国, 吕有厂. 热冲击对煤岩细观损伤及力学特性影响研究[J]. 中国安全科学学报, 2020, 30(12): 85-92.

QI Xiaohan, MA Heng, WANG Xiaoqi, ZHANG Zunguo, LYU Youchang. Impacts of thermal shocks on meso-damage and mechanical properties of coal[J]. China Safety Science Journal, 2020, 30(12): 85-92.

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热冲击对煤岩细观损伤及力学特性影响研究

Impacts of thermal shocks on meso-damage and mechanical properties of coal

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