忻州窑烟煤I型和II型断裂特性的半圆弯曲试验对比研究

doi:10.13722/j.cnki.jrme.2019.0306

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摘要为研究切缝深度和层理角度对煤样I，II型断裂特性的影响差异，采用半圆弯曲测试法对SCB煤样开展3种切缝深度和5种层理角度下的I，II型断裂测试，分析切缝深度与层理角度对煤样I，II型断裂峰值载荷、断裂韧度及裂纹扩展路径的影响规律；并对煤样加载过程中的声发射信号进行实时监测，获取煤样变形破坏过程中的微裂纹损伤演化及宏观破坏特征。研究表明：测试煤样的II型断裂峰值载荷与断裂韧度均大于I型断裂峰值载荷与断裂韧度，且KIIC/KIC = 1.02；煤样I，II型断裂峰值载荷随无量纲切缝深度?的增加逐级降低，断裂韧度KIC和KIIC均随?的增加先增大后减小。II型断裂峰值载荷与断裂韧度随层理角度的增加均先减小后增大，呈“对勾”型分布；煤的I型断裂裂纹扩展路径近似为直线，而II型断裂裂纹扩展路径为曲线。层理对II型断裂裂纹扩展路径影响较大，层理角度为22.5°，45°和90°时，裂纹出现沿层理面扩展的现象；煤样的I，II型断裂破坏过程分为压密、裂纹稳定扩展和裂纹非稳定扩展3个阶段。总体表现为拉伸裂纹主导的拉剪复合型断裂，拉伸微裂纹最先发育，之后拉剪复合型微裂纹急剧扩展，并最终造成试样的宏观失稳破坏。

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	赵毅鑫1
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	孙荘2
	刘斌2

关键词 ：采矿工程, 煤样, II型断裂, 半圆弯曲, 切缝深度, 层理角度, 声发射

Abstract：In order to study the influence of the crack length and the bedding angle on the characteristics of modes I and II fracture of coal，the specimens with three kinds of crack lengths and five kinds of bedding angles were tested by using the semi-circular bending test method. The influence of the crack length and the bedding angle on the peak load，the fracture toughness and the crack propagation path of modes I and II fracture were analyzed. The acoustic emission signals were monitored and the microcrack damage evolution and macroscopic failure characteristics were obtained. The experimental results indicate that the peak load and the fracture toughness of model II fracture of bituminous coal are respectively greater than those of mode I fracture and KIIC/KIC equals to 1.02. With increasing the dimensionless crack length α，the peak loads of both modes I and II of coal decrease gradually while both KIC and KIIC increase first and then decrease. Both the peak load and the fracture toughness of model II decrease first and increase in a “check” pattern with rising the bedding angle. The crack propagation paths of modes I and II fracture of coal are respectively linear and nonlinear. Beddings have a great influence on the crack growth path of mode II fracture，and the crack propagates along the bedding plane as the bedding angle is 22.5°，45°or 90°. The fracture failure process of modes I and II fracture can be classified to be three stages as compaction，steady crack propagation and unsteady crack propagation. In general，modes I and II fracture present a mixed tensile-shear behavior dominated by tensile cracks. More specifically，the tensile microcracks develop first，then the tensile and shear composite microcracks expand extremely and finally failure occurs.

Key words： mining engineering coal sample mode II fracture semi-circular bending crack length bedding angle acoustic emission

引用本文:

赵毅鑫1，2，孙荘2，刘斌2. 忻州窑烟煤I型和II型断裂特性的半圆弯曲试验对比研究[J]. 岩石力学与工程学报, 2019, 38(8): 1593-1604.
ZHAO Yixin1，2，SUN Zhuang2，LIU Bin2. Comparative study of semi-circular bending tests for modes I and II#br# fracture characteristics of Xinzhouyao bituminous coal. , 2019, 38(8): 1593-1604.

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http://www.rockmech.org/CN/10.13722/j.cnki.jrme.2019.0306 或 http://www.rockmech.org/CN/Y2019/V38/I8/1593

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