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Title
Influence of fracture dip angle on coal brittleness and energy evolution
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作者
毕小萍孙利
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Author
BI Xiaoping;SUN Li
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单位
信阳学院 土木工程学院,河南 信阳 464000信阳学院 数学与统计学院,河南 信阳 464000
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Organization
School of Civil Engineering, Xinyang University
School of Mathematics and Statistics, Xinyang University
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摘要
通过预制含不同倾角裂缝的原煤试样进行单轴力学试验,分析了其物理特性及承载破坏过程的能量演化特征。研究发现:含预制裂缝煤体随裂缝倾角的减小,煤体单轴抗压极限呈二次函数逐渐降低,弹性模量呈线性降低;含预制裂缝煤体随裂缝倾角的减小,煤体的脆性逐渐降低,倾角为0°时降低幅度达到36.41%;煤体耗散能占比Rd的“N”形曲线可以反映煤体失稳前兆信息,煤体预制裂缝倾角越小,Rd发生波动变化和到达最小值越早,且Rd变化越剧烈。
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Abstract
By prefabricating raw coal samples with cracks of different dip angles, uniaxial mechanical tests are carried out. Based on these, the energy evolution characteristics of the bearing failure process are analyzed. It is found that the uniaxial compressive limit of the coal decreases gradually with the decrease of the crack inclination, and the modulus of elasticity decreases linearly. And the brittleness of coal containing pre-fabricated crack gradually decreases as the angle of inclination of the fracture decreases, with the reduction of 36.41% at an angle of inclination of 0°. The “N” curve of the dissipation energy ratio Rd of the coal can reflect the precursor information of coal instability. The smaller the crack inclination of the prefabricated crack of coal, the earlier the Rd fluctuates and reaches the minimum value, the more drastic the Rd changes.
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关键词
煤预制裂缝裂缝倾角耗散能占比煤体脆性
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KeyWords
coal;pre-fabricated crack;crack inclination;proportion of dissipated energy;coal brittleness
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基金项目(Foundation)
河南省高等学校重点科研资助项目(22B630019)
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DOI
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引用格式
毕小萍,孙利. 裂缝倾角对煤脆性及能量演化的影响[J]. 煤矿安全,2023,54(9):129−136
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Citation
BI Xiaoping, SUN Li. Influence of fracture dip angle on coal brittleness and energy evolution[J]. Safety in Coal Mines, 2023, 54(9): 129−136
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