考虑孔隙瓦斯劣化作用的煤岩损伤本构模型

矿井瓦斯是煤岩体赋存环境因素之一,同时也是影响煤岩力学性质的主要因素,研究基于煤岩损伤统计特征及Drucker-Prager破坏准则,分析得出了煤岩单轴压缩载荷作用下损伤演化本构模型,基于煤岩弹性波速相关理论建立了孔隙瓦斯对煤岩力学性能劣化损伤力学模型,并在此基础上得出了考虑孔隙瓦斯劣化作用的煤岩损伤本构模型;以原煤及型煤试样为研究对象,开展了不同孔隙瓦斯压力条件下煤岩单轴压缩破坏实验,基于实验研究结果对模型进行了验证。研究结果表明所建立的模型可以很好的反映孔隙瓦斯作用下煤岩单轴压缩载荷条件下的应力-应变关系。

Constitutive model of coal or rock damage related to

Coal mine gas is one of the environments where coal or rock body occurs, and it is also a key factor to influence the mechanical properties of coal or rock. By investigating the statistical characteristics of coal or rock damage and Drucker-Prager destruction criteria, the constitutive model of damage evolution under coal or rock uniaxial compression load was obtained. According to coal or rock elastic wave speed related theory, the mechanical model of degradation damage of coal or rock mechanical performance by pore gas was established. Based on this, the constitutive model of coal or rock damage taking into account the degradation role of pore gas was attained. raw coal and moulded coal as research object, the coal or rock uniaxial compression damage experiments under dif- ferent pore gas pressures were conducted. According to the experimental results, the model was validated. The research results indicate that, the established model can satisfactorily reflect the stress-stain relationship of the loading condition under the role of pore gas.