液氮冷加载对不同含水饱和度节理煤样损伤的影响  

Effect of cold loading by liquid nitrogen on damage of coal samples with varied joint angles and water saturation levels

作　　者：李和万[1] 刘戬 高熹才 王来贵[1] 孙思洋 朱志洁[3] LI Hewan;LIU Jian;GAO Xicai;WANG Laigui;SUN Siyang;ZHU Zhijie(School of Mechanics and Engineering,Liaoning Technical University,Fuxin,Liaoning 123000,China;Western Coal Green Development State key Laboratory,Xi’an University of Science and Technology,Xian,Shaanxi 710054,China;Mining Institute,Liaoning Technical University,Fuxin,Liaoning 123000,China)

机构地区：[1]辽宁工程技术大学力学与工程学院,辽宁阜新123000 [2]西安科技大学西部煤炭绿色安全开发国家重点实验室,陕西西安710054 [3]辽宁工程技术大学矿业学院,辽宁阜新123000

出　　处：《采矿与安全工程学报》2022年第2期413-420,共8页Journal of Mining & Safety Engineering

基　　金：国家自然科学青年基金项目(51704142);国家重点研发项目(2017YFC1503102);辽宁省博士科研启动基金项目(2019-BS-115);西部煤炭绿色安全开发国家重点实验室开放基金项目(SKLCRKF1913)。

摘　　要：为了研究煤层物理性质(节理角度、含水饱和度)在液氮制冷过程中对煤样原有节理结构的影响,利用物理实验及ABAQUS软件数值模拟的方法建立贯穿型节理模型,以节理角度与不同饱水度作为主要参数:节理角度按照与层理夹角分为15°、45°、60°,含水饱和度分别为0%、50%和100%,对煤样进行循环冷加载交叉实验与模拟。结果表明:(1)随着加载周期的增加,45°夹角煤样节理结构损伤最明显,60°夹角煤样节理结构损伤效果最弱。(2)随着含水饱和度的提高,煤样破碎的冷加载周期减少,单轴抗压强度降低;(3)通过ABAQUS软件建立的煤样损伤物理力学模型,与实验结果吻合度较高,含水饱和度100%、45°节理角度煤样经过4T冷加载发生破裂。In order to investigate the effect of coal seam physical properties(joint angle and water saturation)on original joint structure of coal samples during liquid nitrogen refrigeration,a penetrating joint model was established through physical experiment and numerical simulation with the software of ABAQUS.With different joint angles(15°,45°and 60°)and saturation levels(0%,50%and 100%)as main parameters,coal samples were tested in the crossover experiment and simulation of cyclic cold loading.The results have shown that (1)With the increase of loading cycles,damage extension for samples with 45°joint angle structure is the most obvious,and damage effect for samples with 60°joint angle structure is the weakest;(2)With the increase of water saturation level,the number of cold loading cycles needs to make coal fracture decrease and uniaxial compressive strength of samples decrease;(3)Physical and mechanical model on coal sample damage established with ABAQUS has good agreement with experimental results,and coal samples with 100%water saturation and 45°joint angle are fractured after 4 cycles of cold loading.

关 键 词：液氮 裂隙 增透 疲劳增扩 含水煤样 

分 类 号：TD315[矿业工程—矿井建设]