Article(id=1273953323335061906, tenantId=1146029695717560320, journalId=1272209045839646724, issueId=1273953231114887613, articleNumber=null, orderNo=null, doi=10.20174/j.JUSE.2026.02.20, pmid=null, cstr=null, oa=null, hot=null, price=null, onlineType=0, articleFormat=0, articleType=null, articleTypeStr=null, receivedDate=1746633600000, receivedDateStr=2025-05-08, revisedDate=null, revisedDateStr=null, acceptedDate=null, acceptedDateStr=null, onlineDate=1781663741190, onlineDateStr=2026-06-17, pubDate=1776614400000, pubDateStr=2026-04-20, doiRegisterDate=null, doiRegisterDateStr=null, onlineIssueDate=1781663741190, onlineIssueDateStr=2026-06-17, onlineJustAcceptDate=null, onlineJustAcceptDateStr=null, onlineFirstDate=null, onlineFirstDateStr=null, sourceXml=null, magXml=null, createTime=1781663741190, creator=13701087609, updateTime=1781663741190, updator=13701087609, issue=Issue{id=1273953231114887613, tenantId=1146029695717560320, journalId=1272209045839646724, year='2026', volume='22', issue='2', pageStart='377', pageEnd='752', issueExtLink='null', onlineDate='null', pubDate='null', beforeIssueId=null, nextIssueId=null, price=null, status=1, issueComplete=1, articleOrder=1, issueType=1, specialIssue=null, createTime=1781663719203, creator=13701087609, updateTime=1781663760928, updator=13701087609, preIssue=null, nextIssue=null, ext={EN=IssueExt(id=1273953406235467954, tenantId=1146029695717560320, journalId=1272209045839646724, issueId=1273953231114887613, language=EN, specialIssueTitle=, coverIllustrator=null, specialIssueEditor=, specialIssueAbout=), CN=IssueExt(id=1273953406235467955, tenantId=1146029695717560320, journalId=1272209045839646724, issueId=1273953231114887613, language=CN, specialIssueTitle=, coverIllustrator=null, specialIssueEditor=, specialIssueAbout=)}, issueFiles=null}, startPage=583, endPage=591, ext={EN=ArticleExt(id=1273953323565748628, articleId=1273953323335061906, tenantId=1146029695717560320, journalId=1272209045839646724, language=EN, title=Bedding Effect of the Mechanical Properties of Coal Based on Nanoindentation Test, columnId=null, journalTitle=Chinese Journal of Underground Space and Engineering, columnName=null, runingTitle=null, highlight=null, articleAbstract=

To explore the influence of coal and rock bedding plane effects on mechanical properties, the micro-mechanical properties of coal and rock with different bedding directions are studied based on nanoindentation tests. By plotting the load-displacement curves of each group of samples, the micro-mechanical parameters of coal and rock with different bedding orientations are obtained and the failure modes of coal and rock are analyzed. Furthermore, the propagation laws of hydraulic fracturing fractures in coal and rock are discussed. The research shows that the microstructure of coal and rock is dense, the bedding structure is clear, and the bedding planes are filled with hard minerals such as quartz, accompanied by a certain amount of natural micro-cracks and developed self-generated pores. Through nanoindentation tests, it is found that the coal and rock samples have obvious anisotropy. The elastic modulus of coal and rock perpendicular to the bedding plane, parallel to the bedding plane, and at an oblique angle to the bedding plane are 5.02 GPa, 4.58 GPa, and 4.92 GPa, respectively, and the hardness is 0.38 GPa, 0.35 GPa, and 0.37 GPa, respectively. The elastic modulus and hardness of coal and rock are consistent with their macroscopic mechanical laws. In terms of the energy dissipation characteristics of failure in different directions, the coal and rock perpendicular to the bedding plane require the largest fracture energy, while the coal and rock parallel to the bedding plane have the smallest fracture energy dissipation. In addition, the fracture toughness is 0.25, 0.22, and 0.23 MPa·m^0.5, respectively. The brittleness coefficient of coal and rock varies with the differences in failure forms in different directions. Based on the nanoindentation test data, the propagation characteristics of fractures under different bedding directions are revealed. Fractures in the direction perpendicular to the bedding plane extend along natural fissures, fractures parallel to the bedding plane mainly develop along the weak bedding plane, and fractures at an oblique angle to the bedding plane are more prone to branching during the deep extension process. The research results provide scientific data support for the engineering application of coal and rock, offer important references for engineering design, construction, monitoring and optimization, and have the potential to improve the safety and economy of engineering, contributing to sustainable development.

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为探究层理效应对煤岩力学性能的影响，基于纳米压痕试验对煤岩不同层理方向的微观力学性能展开研究。通过绘制各组试样的荷载-位移曲线，获取不同层理方位煤岩的微观力学参数并分析煤岩破坏模式，进一步探讨煤岩水力压裂裂缝延展规律。研究表明：煤岩的微观结构致密，层理结构清晰，层理间填充有石英等坚硬矿物，伴随一定量的天然微裂缝和自生孔隙发育；通过纳米压痕试验，发现煤岩试样具有明显的各向异性，垂直层理、平行层理、斜交层理煤岩的弹性模量依次为5.02 GPa、4.58 GPa、4.92 GPa，硬度分别为0.38 GPa、0.35 GPa、0.37 GPa；煤岩的弹性模量和硬度大小符合其宏观力学规律；在不同方向上的破坏能量耗散特征方面，垂直层理煤岩所需的断裂能量最大，平行层理煤岩断裂能量耗散最小，断裂韧度依次为0.25、0.22、0.23 MPa·m^0.5；煤岩的脆性系数随着不同方向破坏形式的差异而变化；基于纳米压痕试验数据，揭示了不同层理方向下裂缝的扩展特征，垂直层理方向裂缝沿天然缝隙扩展，平行层理裂缝主要沿层理弱面发展，而斜交层理则表现出裂缝在向深部延伸过程中更易产生分支。研究结果可为煤岩的工程应用提供数据支持。

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张超鹏（2000—），男，吉林白山人，硕士，主要从事储层岩石力学研究。E-mail: 1049298745@qq.com

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张超鹏（2000—），男，吉林白山人，硕士，主要从事储层岩石力学研究。E-mail: 1049298745@qq.com

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