破坏程度不同煤体失稳过程红外辐射及裂隙演化特征研究  

Characterization of infrared radiation and fracture evolution during destabilization of coal bodies with different degrees of damage

作　　者：唐一举 郝天轩[2,3] 刘静 李帆 赵立桢 王泽华 王浩昌 刘迅 TANG Yi-ju;HAO Tian-xuan;LIU Jing;LI Fan;ZHAO Li-zhen;WANG Ze-hua;WANG Hao-chang;LIU Xun(College of Municipal and Environmental Engineering,Henan University of Urban Construction,Pingdingshan,Henan 467036,China;College of Safety Science and Engineering,Henan Polytechnic University,Jiaozuo,Henan 454000,China;State Collaborative Innovation Center of Coal Work Safety and Clean-efficiency Utilization,Henan Polytechnic University,Jiaozuo,Henan 454000,China;Zhaogu No.2 Mine,Jiaozuo Coal Industry(Group)Xinxiang Energy Co.,Ltd.,Xinxiang,Henan 453633,China;No.11 Mine of China Pingmei Shenma Group,Pingdingshan,Henan 467000,China)

机构地区：[1]河南城建学院市政与环境工程学院,河南平顶山467036 [2]河南理工大学安全科学与工程学院,河南焦作454000 [3]河南理工大学煤炭安全生产与清洁高效利用省部共建协同创新中心,河南焦作454000 [4]焦作煤业(集团)新乡能源有限公司赵固二矿,河南新乡453633 [5]中国平煤神马集团十一矿,河南平顶山467000

出　　处：《岩土力学》2023年第10期2907-2920,共14页Rock and Soil Mechanics

基　　金：国家自然科学基金(No.51774117);河南省高等学校重点科研项目(No.22B620001,No.22B880005);河南省科技攻关(No.222102320413)。

摘　　要：为了探讨破坏程度不同煤体的力学行为、红外辐射及裂隙演化特征,进行了单轴压缩过程中同步红外辐射检测试验,分析了不同试样受载后力学行为及红外辐射响应特征。在试样宏观力学特性的基础上,采用颗粒流PFC2D对试样单轴压缩进行模拟,从细观尺度上分析了试样裂隙的演化特征。研究结果表明:破坏程度影响了试样的强度、变形特征,随着破坏程度的增强,试样表现出弱脆性、强塑性特征;破坏程度不同试样均表现出增温的时变特征,Ⅰ类、Ⅱ类试样临破裂前温度出现骤增的前兆特征,温度突增可达1.7℃左右,而Ⅲ类试样则表现为先骤降后快速上升的变化特征,温度增加0.93℃;加载过程中红外热像出现分异特征,高温或低温异常区域对应着煤岩试样破坏的空间位置;试样破坏区域与红外辐射异常区域大致相同,内部损伤(裂隙发育)与表面损伤(红外辐射)有着密切的关联性。该研究结果可为破坏程度不同煤体采掘过程中的动力灾害预警提供参考。To investigate the mechanical behavior,infrared radiation,and fracture evolution characteristics of coal with different degrees of damage,simultaneous infrared radiation detection tests were carried out during uniaxial compression to analyze the mechanical behavior and infrared radiation response characteristics of different specimens after loading.And then based on the macroscopic mechanical properties of the specimens,particle flow software PFC2D was used to simulate the uniaxial compression of the specimens to analyze the fracture evolution characteristics of the specimens on a meso-scale.The results show that the degree of damage affects the strength and deformation characteristics of the specimens.With the increase of the degree of damage,the specimens show weak brittleness and strong plasticity characteristics;the specimens with different degrees of damage all show time-varying characteristics of temperature increase;the temperature of Class I and Class II specimens show a precursor of a sudden increase before rupture,with a sudden increase of temperature up to about 1.7℃,while Class III specimens show the characteristics of a sudden drop followed by a rapid increase,with a temperature increase of 0.93℃.The thermal infrared images show divergent characteristics during the loading process,with the high or low-temperature anomalies corresponding to the spatial location of the damage to the coal rock specimens.The damaged area of the specimens is approximately the same as the anomalous area of the infrared radiation,and there is a close correlation between the internal damage(fracture development)and the surface damage(infrared radiation).The results of the study can provide a reference for the early warning of dynamic hazards during the mining process of coal bodies with different degrees of damage.

关 键 词：破坏程度 变形破裂 红外辐射 裂隙演化 

分 类 号：TD823[矿业工程—煤矿开采]