Abstract

Uniaxial compression test of outburst coal was conducted to explore the mechanical characteristics of coal with outburst tendency in low gas pressure environment. The mechanical properties of coal were analyzed, the surface crack morphology of coal was obtained and the energy characteristics of coal during loading were determined. Results are as follows. In the pressure range of 0.03–1.0 MPa, the uniaxial compressive strength and elastic modulus of coal show a negative exponential relationship with pressure, and both decrease with the increase in pressure. With the increase in gas pressure, the angle between the failure surface and horizontal surface of coal body increases gradually. With the increase in gas pressure, the fracture morphology of coal failure tends to be complex. When the gas pressure is low, the coal can store a large amount of energy, and its ability to resist damage is greatly improved.

中文翻译：

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单轴压缩过程中低瓦斯压力对突出煤物理性质的影响

摘要

开展突出煤单轴压缩试验，探讨低瓦斯压力环境下有突出倾向煤的力学特性。分析了煤的力学特性，获得了煤的表面裂纹形貌，确定了煤在装载过程中的能量特征。结果如下。在0.03～1.0 MPa压力范围内，煤的单轴抗压强度和弹性模量与压力呈负指数关系，均随压力的增加而降低。随着瓦斯压力的增加，煤体破坏面与水平面的夹角逐渐增大。随着瓦斯压力的增加，煤体破坏的断裂形态趋于复杂。当气体压力较低时，