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An analytical model of the mechanical properties of bulk coal under confined stress

机译：约束应力下散煤力学性能的解析模型

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This paper presents the development of an analytical model which can be used to relate the structural parameters of coal to its mechanical properties such as elastic modulus and Poisson's ratio under a confined stress condition. This model is developed primarily to support process modeling of coalbed methane (CBM) or CO_2-enhanced CBM (ECBM) recovery from coal seam. It applied an innovative approach by which stresses acting on and strains occurring in coal are successively combined in rectangular coordinates, leading to the aggregated mechanical constants. These mechanical properties represent important information for improving CBM/ECBM simulations and incorporating within these considerations of directional permeability. The model, consisting of constitutive equations which implement a mechanically consistent stress-strains correlation, can be used as a generalized tool to study the mechanical and fluid behaviors of coal composites. An example using the model to predict the stress-strain correlation of coal under triaxial confined stress by accounting for the elastic and brittle (non-elastic) deformations is discussed. The result shows a good agreement between the prediction and the experimental measurement.
机译：本文提出了一种分析模型的开发，该模型可用于在限制应力条件下将煤的结构参数与其力学性能（例如弹性模量和泊松比）相关联。开发该模型主要是为了支持从煤层中开采煤层气（CBM）或提高CO_2的煤层气（ECBM）的过程模型。它采用了一种创新的方法，通过该方法，作用在煤上的应力和在煤中发生的应变在直角坐标中相继合并，从而产生了聚集的机械常数。这些机械性能代表了改善CBM / ECBM模拟并将方向渗透性考虑在内的重要信息。该模型由执行机械一致的应力-应变相关性的本构方程组成，可以用作研究煤炭复合材料力学和流体行为的通用工具。讨论了一个使用该模型通过考虑弹性和脆性（非弹性）变形来预测三轴约束应力下煤的应力-应变相关性的示例。结果表明预测结果与实验测量结果吻合良好。

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