|本期目录/Table of Contents|

[1]苏伟伟.界面倾角与构造煤厚度作用下复合煤体失稳机制研究*[J].中国安全生产科学技术,2026,22(5):22-30.[doi:10.11731/j.issn.1673-193x.2026.05.003]
　Su Weiwei.Study on instability mechanism of composite coal body under the action of interface dip angle and tectonic coal thickness[J].Journal of Safety Science and Technology,2026,22(5):22-30.[doi:10.11731/j.issn.1673-193x.2026.05.003]
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界面倾角与构造煤厚度作用下复合煤体失稳机制研究*

《中国安全生产科学技术》[ISSN:1673-193X/CN:11-5335/TB]

卷:
22
期数:
2026年5期
页码:
22-30
栏目:
安全工程技术
出版日期:
2026-05-30

文章信息/Info

Title:
Study on instability mechanism of composite coal body under the action of interface dip angle and tectonic coal thickness
文章编号:
1673-193X(2026)-05-0022-09
作者:
苏伟伟
（1.煤炭科学研究总院有限公司，北京 100013；
2.河南省瓦斯地质与瓦斯治理重点实验室——省部共建国家重点实验室培育基地，河南 焦作 454000）
Author(s):
Su Weiwei
(1.Chinese Institute of Coal Science,Beijing 100013,China;
2.State Key Laboratory Cultivation Base fore Gas Geology and Gas Control,Henan Polytechnic University,Jiaozuo Henan 454000,China)
关键词:
原生煤; 构造煤; 复合煤体; 力学失稳; 煤与瓦斯突出
Keywords:
primary coal;  tectonic coal;  composite coal body;  instability mechanism;  coal and gas outburst
分类号:
X936
DOI:
10.11731/j.issn.1673-193x.2026.05.003
文献标志码:
A
摘要:
为探究原生煤与构造煤复合煤体的力学不平衡特征，揭示复合煤体界面效应，系统阐释复合煤体力学失稳演化过程及致灾机制。采用实验测试方法获取原生煤和构造煤不同围压加载下力学特征参数，探究煤体在内摩擦角和黏聚力呈现的差异性；运用PFC颗粒流软件构建不同界面倾角及构造煤厚度占比的数值模型，探究不同倾角与不同构造煤厚度对复合煤体失稳破坏的影响机制，定量表征复合煤体破坏过程与裂纹数量。研究结果表明：原生煤与构造煤力学参数差异显著，其内摩擦角分别为47.69°和34.04°，黏聚力分别为3.79 MPa和0.44 MPa，单轴条件下峰值强度相差达15.2倍。当原生煤与构造煤的倾角从0°增至30°时，应力沿界面集中，导致强力链更早形成并富集于构造煤区域，倾角越大构造煤中的位移越大，整体强度进一步弱化；随着构造煤厚度占比从20%增至60%，破坏主体由原生煤转向构造煤，位移更集中于构造煤区域。结合能量分析结果，发现峰后阶段耗散能增量与应变能释放量分别由29.1 kJ和21.6 kJ降至11.4 kJ和4.8 kJ，应变能释放量降幅更大，导致耗散能占比相对提高并主导破坏过程。研究结果可为复合煤体力学失稳致灾的防治提供理论支撑。
Abstract:
In order to explore the mechanical imbalance characteristics of composite coal body of primary coal and tectonic coal,reveal the interface effect of composite coal body,and systematically explain the mechanical instability evolution process and disaster-causing mechanism of composite coal body,the mechanical characteristic parameters of primary coal and tectonic coal under different confining pressure loading were obtained by experimental test method.The difference of internal friction angle and cohesion of coal was explored.PFC particle flow software was used to construct a numerical model of different interface dip angles and the proportion of tectonic coal thickness.The influence mechanism of different dip angles and different tectonic coal thickness on the instability and failure of composite coal body was explored,and the failure process and crack number of composite coal body were quantitatively characterized.The results show that the mechanical parameters of primary coal and tectonic coal are significantly different.The internal friction angles are 47.69° and 34.04°,and the cohesions are 3.79 MPa and 0.44 MPa,respectively.The difference of peak strength under uniaxial condition is 15.2 times.When the dip angle of primary coal and tectonic coal increases from 0 ° to 30 °,the stress concentrates along the interface,resulting in the formation of strong chain earlier and enrichment in the tectonic coal area.The larger the dip angle is,the larger the displacement in the tectonic coal is,and the overall strength is further weakened.As the proportion of tectonic coal thickness increases from 20 % to 60 %,the main body of destruction changes from primary coal to tectonic coal,and the displacement is more concentrated in the tectonic coal area.Combined with the results of energy analysis,it is found that the increment of dissipated energy and the release of strain energy in the post-peak stage decrease from 29.1 kJ and 21.6 kJ to 11.4 kJ and 4.8 kJ,respectively,and the decrease of strain energy release is greater,resulting in a relatively increase in the proportion of dissipated energy and leading the failure process.The research results can provide theoretical support for the prevention and control of mechanical instability of composite coal.

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备注/Memo

备注/Memo:
收稿日期： 2026-01-22；修回日期：2026-04-15
* 基金项目： 国家自然科学基金联合基金项目（U23B2094）；河南省瓦斯地质与瓦斯治理重点实验室—省部共建国家重点实验室培育基地开放基金项目（WS2024A03）
作者简介： 苏伟伟，硕士，副研究员，主要研究方向为煤矿瓦斯灾害预测及防治。
更新日期/Last Update: 2026-06-03