[1]薛珂,王江涛,张毓颖,等.三轴加载条件下层理煤体的力学特性和破坏机制研究[J].中国安全生产科学技术,2023,19(12):71-78.[doi:10.11731/j.issn.1673-193x.2023.12.009]
XUE Ke,WANG Jiangtao,ZHANG Yuying,et al.Study on mechanical properties and failure mechanism of layered coal under triaxial loading conditions[J].JOURNAL OF SAFETY SCIENCE AND TECHNOLOGY,2023,19(12):71-78.[doi:10.11731/j.issn.1673-193x.2023.12.009]
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三轴加载条件下层理煤体的力学特性和破坏机制研究
XUE Ke,WANG Jiangtao,ZHANG Yuying,et al.Study on mechanical properties and failure mechanism of layered coal under triaxial loading conditions[J].JOURNAL OF SAFETY SCIENCE AND TECHNOLOGY,2023,19(12):71-78.[doi:10.11731/j.issn.1673-193x.2023.12.009]
《中国安全生产科学技术》[ISSN:1673-193X/CN:11-5335/TB]
- 卷:
- 19
- 期数:
- 2023年12期
- 页码:
- 71-78
- 栏目:
- 职业安全卫生管理与技术
- 出版日期:
- 2023-12-31
文章信息/Info
- Title:
- Study on mechanical properties and failure mechanism of layered coal under triaxial loading conditions
- 文章编号:
- 1673-193X(2023)-12-0071-08
- Keywords:
- confining pressure; layer angle; mechanical properties; deformation and failure characteristics; Moir-Coulomb criterion; failure mechanism
- 分类号:
- X936
- 文献标志码:
- A
- 摘要:
- 为了探究围压和层理角度对煤体力学特性、变形破坏特征的影响，对不同层理角度煤样开展不同围压下的三轴加载破坏试验，并利用摩尔-库伦准则对煤体的破坏机制进行研究。研究结果表明：煤样峰值偏应力随围压增大的平均增幅随α的增大呈“V”型分布，0°煤样平均增幅最大为14.51%，45°煤样最小为6.72%；随着围压增大，0°和90°煤样的峰值应变不断增大，45°煤样的峰值应变逐渐减小；围压增大使得煤样由局部破坏向整体性破坏转变，破碎程度显著增加；利用摩尔-库伦准则对煤体的破坏机制进行分析发现：煤样的内摩擦角和黏聚力随层理角度增大先减小后增大；煤体在一定角度范围内沿结构面发生剪切破坏，超出这个范围产生复合破坏形式，逐渐趋向于完整岩石破坏。研究结果可为矿井围岩监测提供一定的参考和依据。
- Abstract:
- To explore the influence of confining pressure and layer angle on the mechanical properties and deformation failure characteristics of coal body,the triaxial loading failure experiments under different confining pressures were carried out on coal samples with different layer angles,and the failure mechanism of coal body was studied by using the Moir-Coulomb criterion.The results show that the average increase of peak bias stress of coal samples with the increase of confining pressure presents a “V” pattern distribution with the increase of α,the average increase of 0° coal samples is 14.51%,and the minimum increase of 45° coal samples is 6.72%.With the increase of confining pressure,the peak strain of 0° and 90° coal samples increase continuously,and the peak strain of 45° coal samples gradually decreases.The increase of confining pressure causes the coal sample to change from local failure to overall failure,and the degree of fragmentation increases significantly.The Moir-Coulomb criterion is used to analyze the failure mechanism of coal body,and it is found that the internal friction angle and cohesion of coal samples decrease first and then increase with the increase of layer angle.The coal body undergoes shear failure along the structural surface within a certain angle range,while the composite failure form is produced beyond this range,and gradually tends to complete rock failure.The research results can provide a certain reference and basis for the mine surrounding rock monitoring.
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备注/Memo
- 备注/Memo:
-
收稿日期： 2023-07-27
作者简介： 薛珂，硕士研究生，主要研究方向为灾害防治理论与技术。
