蒋庄煤矿正断层影响下煤岩微观力学性质及其对孔隙结构的影响  

Microscopic Mechanical Properties of Coal and Rock and Their Effects on Pore Structure under Normal Faults in Jiangzhuang Coal Mine

作　　者：王印 杨廷军 宁树正 王自国 朱利岗 黄佳威 薛欣宇 王安民[4] WANG Yin;YANG Tingjun;NING Shuzheng;WANG Ziguo;ZHU Ligang;HUANG Jiawei;XUE Xinyu;WANG Anmin(Jiangzhuang Coal Mine of Zaozhuang Mining Group Co.,Ltd.,Zaozhuang,Shandong 277000;General Prospecting Institute,CNACG,Beijing 100038;Key Laboratory of Transparent Mine Geology and Digital Twin Technology,National Mine Safety Administration,Beijing 100039;College of Geoscience and Surveying,China University of Mining and Technology(Beijing),Beijing 100083)

机构地区：[1]枣庄矿业(集团)有限责任公司蒋庄煤矿,山东枣庄277000 [2]中国煤炭地质总局勘查研究总院,北京100038 [3]矿山透明地质与数字孪生技术国家矿山安监局重点实验室,北京100039 [4]中国矿业大学(北京)地球科学与测绘工程学院,北京100083

出　　处：《中国煤炭地质》2025年第2期9-15,共7页Coal Geology of China

基　　金：枣庄矿业(集团)有限责任公司科技项目(SNZB-ZKJTD20226-0300);中国矿业大学(北京)大学生创新训练项目(202302026)。

摘　　要：蒋庄煤矿广泛发育正断层,断裂带内煤层变形严重,导致其力学性质和孔隙结构发生改变,影响着煤矿的安全高效开采。在蒋庄煤矿北十采区工作面揭露的正断层破碎带及其上、下盘采取煤及顶板岩石样品,运用纳米压痕实验准确测定其力学性质,通过二氧化碳及氮气吸附实验求得煤中孔隙特征,在此基础上探讨力学性质对煤中孔隙结构的影响。结果显示,蒋庄煤矿断层上、下盘的煤的平均弹性模量分别为5.96GPa和5.99 GPa,平均硬度分别为0.52 GPa和0.49 GPa,相差不大,而断层带内煤的平均弹性模量和平均硬度分别为5.40 GPa和0.43 GPa,明显低于断层上、下盘煤样。同样的,断层带内煤的顶板砂岩硬度急剧降低,其平均值为0.52 GPa,远低于断层上、下盘煤的顶板砂岩硬度。正断层使得煤中微孔体积增大、介孔体积减少,煤中微孔孔径主要分布在0.5~0.8 nm的范围中,而介孔孔径主要分布在3~5 nm的范围内。煤的弹性模量、硬度与煤的总孔体积和介孔体积均成正比,而平均硬度与微孔体积呈现出负相关关系。同时,平均弹性模量、平均硬度均与比表面积呈正相关、与微孔比表面积呈负相关。说明煤的弹性模量、硬度等力学性质越强,煤中微孔含量越低,介孔含量越高。Jiangzhuang coal mine is characterized by widespread development of normal faults.Severe deformation of coal seams within the fault zones alters their mechanical properties and pore structures,impacting safe and efficient mining.Therefore,this article takes the Jiangzhuang coal mine in the southwestern region of Shandong province as an example,using nanoindentation experiments,and carbon dioxide and nitrogen adsorption experiments to accurately determine the mechanical properties of the same coal seam in the hanging wall,footwall,and fault zones,and to explore its influence on the pore structure of coal.The results showed that the average elastic modulus of coal in the hanging wall and footwall of the fault in Jiangzhuang coal mine was 5.96 GPa and 5.99 GPa,respectively,and the average hardness was 0.52 GPa and 0.49 GPa,with little difference.However,the average elastic modulus and average hardness of coal in the fault zone were 5.40 GPa and 0.43 GPa,respectively,which were significantly lower than the coal samples in the hanging wall and footwall of the fault.Similarly,the hardness of the roof sandstone of coal in the fault zone sharply decreases,with an average value of 0.52 GPa,which was much lower than the hardness of the roof sandstone of coal in the hanging wall and footwall.The extensional fracture zone causes an increase in the volume of micropores and a decrease in the volume of mesopores in coal.The micropores in coal are mainly distributed in the range of 0.5~0.8 nm in diameter,while mesopores are mainly distributed in the range of 3~5 nm in diameter.The elastic modulus and hardness of coal are directly proportional to the total pore volume and mesoporous volume of coal,while the average hardness is negatively correlated with the micropore volume.Meanwhile,the average elastic modulus and average hardness are positively correlated with the specific surface area and negatively correlated with the microporous specific surface area.The stronger the mechanical properties such as elastic modulus and hardness

关 键 词：正断层 破碎带 煤的力学性质 孔隙结构 

分 类 号：P618.11[天文地球—矿床学]