不同硬度煤样微观表面力学性质差异性研究  

Research on the Differences in Micro-surface Mechanical Properties of Coal Samples with Different Hardness

作　　者：宋大钊 赵丹 纪润清 康忠全 王孟霞 罗思宇 何生全 Song Dazhao;Zhao Dan;Ji Runqing;Kang Zhongquan;Wang Mengxia;Luo Siyu;He Shengquan(School of Civil and Resources Engineering,University of Science and Technology Beijing,Beijing 100083;State Key Lab of Coal Resources and Safety Mining,China University of Mining and Technology(Beijing),Beijing 100083;School of Emergency Management and Safety Engineering,China University of Mining and Technology(Beijing),Beijing 100083;Technical Center of Jinneng Holding Coal Industry Group,Datong Shanxi 037003)

机构地区：[1]北京科技大学土木与资源工程学院,北京100083 [2]中国矿业大学(北京)煤炭资源与安全开采全国重点实验室,北京100083 [3]中国矿业大学(北京)应急管理与安全工程学院,北京100083 [4]晋能控股煤业集团有限公司技术中心,山西大同037003

出　　处：《晋控科学技术》2024年第2期1-7,共7页Jinneng Holding Science and Technology

摘　　要：煤体自身力学性质对瓦斯动力灾害的发生具有重要的影响,为进一步研究软煤和硬煤微观差异性,采用原子力显微镜(AFM)内置PF-QNM模式对两种不同硬度煤样表面进行扫描,结果表明:软煤和硬煤微观形貌及力学性质存在较大差异,软煤表面粗糙度明显大于硬煤,微观表面起伏较小,但波峰数量较多,可为气体吸附提供较多吸附点位。不同煤样扫描区域内表面弹性模量和粘附力均符合正态分布。受构造作用和变质程度的影响,其微观结构排列较为紧密,弹性模量整体表现为大于硬煤。不同煤样微观力学性质均表现出明显的非均质性,煤体表面具有一定的粘附力,具有突出倾向的软煤表面粘附力大多集中在0~100 nN,硬煤表面粘附力大多集中在100~400 n N,软煤的最大引力作用距离d0要明显小于硬煤。在应力扰动或压力梯度作用下,气体容易发生快速解吸,容易导致煤与瓦斯突出事故。The mechanical properties of coal itself have a significant impact on the occurrence of gas dynamic disasters.To further investigate the microscopic differences between soft and hard coal,we employed Atomic Force Microscopy(AFM)with the PF-QNM mode to scan the surfaces of two coal samples with different hardness.The results indicate substantial differences in the microscopic morphology and mechanical properties between soft and hard coal.The surface roughness of soft coal is notably greater than that of hard coal.While the microscopic surface undulations are smaller,there are more peak structures on soft coal,providing more adsorption sites for gases.The surface elastic modulus and adhesion force in different scanning areas of various coal samples both conform to a normal distribution.Influenced by structural and metamorphic factors,its microscopic structure is more closely arranged,and the overall elastic modulus is greater than that of hard coal.The microscopic mechanical properties of different coal samples manifest significant heterogeneity,with coal surfaces demonstrating a certain degree of adhesion force.The prominent soft coal shows adhesion forces concentrated mostly between 0~100 nN,while hard coal adhesion forces are concentrated mostly between 100~400 nN.The maximum attractive force distance d0 of soft coal is notably smaller than that of hard coal.Under stress perturbations or pressure gradients,gases are prone to rapid desorption,leading to potential accidents involving coal and gas outbursts.

关 键 词：原子力显微镜 表面形貌 弹性模量 粘附力 微观 

分 类 号：TD313[矿业工程—矿井建设]