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首页> 外文会议>International Symposium on Mine Safety Science and Engineering >Experimental Study of Original Cracks Features Effecting on Fracture of Coal Samples under Uniaxial Compression
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Experimental Study of Original Cracks Features Effecting on Fracture of Coal Samples under Uniaxial Compression

机译：原始裂缝特征对单轴压缩煤样骨折作用的实验研究

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摘要

The deformation and fracture process under load of coal-rock is the macro manifestation of the internal damage elements like the original crack, which is followed by further rupture, expansion, aggregation and interaction. And this damage appears in various dynamic disasters in coal mine, such as rock burst. Based on the methods such as photography, simplified projection and uniaxial compression system, the effect on original tiny crack distribution features of cylindrical coal sample, coal samples' uniaxial compression strength, acoustic emission and electromagnetic radiation signals are studied. The test results indicates that: the tiny cracks on coal sample surface show three types like cracks that nearly parallel, about 45° inclination angle cracks, and large inclination angle cracks; the size of the original crack has significant impact on the uniaxial compressive strength of coal and signal characteristics of electromagnetic radiation, and the existence of obvious original cracks will significantly reduce the uniaxial compressive strength of coal, while the energy value of the electromagnetic radiation signals will enhance during uniaxial compression.
机译：煤岩负荷下的变形和断裂过程是原始裂缝等内部损伤元素的宏观表现，其次是进一步破裂，膨胀，聚集和相互作用。这种伤害出现在煤矿的各种动态灾害中，如摇滚爆裂。基于诸如拍摄的方法，简化投影和单轴压缩系统，研究了圆柱形煤样，煤样的单轴压缩强度，声发射和电磁辐射信号的原始微小裂纹分布特征。测试结果表明：煤样表面上的微小裂缝显示出三种类型，如裂缝几乎平行，约45°倾角裂缝和大倾角裂缝;原始裂缝的尺寸对电磁辐射的煤和信号特性的单轴抗压强度产生显着影响，并且明显的原始裂缝的存在将显着降低煤的单轴抗压强度，而电磁辐射信号的能量值将会在单轴压缩期间增强。

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