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煤体基质吸附(解吸)变形规律试验研究

ISSN号：1001-7445
期刊名称：广西大学学报(自然科学版)
时间：2012
页码：173-177
分类：TD821[矿业工程—煤矿开采;矿业工程—矿山开采]
作者机构：[1]辽宁工程技术大学力学与工程学院,辽宁阜新123000, [2]西南石油大学土木工程与建筑学院,四川成都610500
相关基金：国家自然科学基金资助项目（50874082;11072102;51174170;51004061）
相关项目：基于实验反演方法的煤与瓦斯突出微观孕育到宏观灾害转化机理研究

关键词：煤层气, 吸附(解吸), 煤基质变形, 试验研究, coalbed methane （ CBM ） , adsorption （ desorption ） , coal deformation , experimental research

中文摘要：

为了更好的掌握煤体吸附（解吸）过程中变形规律，以晋城天地王坡煤矿为例，利用实验室模拟方法，在恒压、环境温度（室温20℃）一定的条件下，研究煤岩基质吸附（解吸）变形规律。实测了不同有效应力及加压方式下煤体的变形量，分析了煤基质吸附（解吸）后的变形规律，得到了弹性阶段煤体变形值与吸附（解吸）量的变化关系，并拟合得出了两者之间的函数关系。通过分析得出以下基本规律：①吸附（解吸）量与煤样应变（解吸过程为收缩变形）随时间的增加而增大，并逐渐趋于稳定，呈现指数分布规律；②吸附（解吸）变形可大致分为三个阶段，即第一阶段吸附（解吸）速度较快，变形量也较大，曲线斜率较大；第二阶段，随解吸量的增加，两者变化幅度相当，曲线斜率接近为1．0；第三阶段，当煤体收缩变形接近原始孔隙体积时，变形量不再增加，曲线斜率接近于零。试验结果为煤矿瓦斯合理抽采及防止煤与瓦斯突出提供了一定的理论依据。

英文摘要：

In order to reveal the law of coal deformation in the process of adsorption （desorption） , taking Tiandiwangpo Mine in Jincheng as an example, under the condition of constant temperature （20 ℃ ） and pressure, the experiment on adsorption, resorption and seepage of coalbed methane （CBM） and coal deformation was carried out. By the observation of coal deformation under different effective stresses and loading methods, the law of adsorption （desorption） deformation of coal matrix was analyzed. The relationship between adsorption （desorption） amount and coal deformation was obtained. And then the relationship expressions were studied. The law was obtained as follows： ①the adsorption （desorption） amount and coal deformation （shrinkage strain） were increased exponentially with time, and became stable gradually;②there are three stages in the process of adsorption （desorption） deformation of coal matrix. In the first stage, the rate of adsorption is high and the coal deformation is very large. Their relationship fits a high-slope curve. In the second stage, the amplitude of resorption and coal deformation is at the same level, and the slope of relationship curve is about 1.0. In the third stage, coal deformation no longer increases, and the slope of relationship curve is about zero, when the coal snaps back to its initial pore volume. These experimental results can provide theoretical basis for the security of CBM drainage and the control of coal-gas outburst.

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