| 岩石气态水吸附特性及其影响因素实验研究 |
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| 作者姓名： | 张娜 赵方方 张毫毫 乔凤超 何满潮 |
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| 作者单位： | 1.深部岩土力学与地下工程国家重点实验室,北京100083;2.中国矿业大学(北京)力学与建筑工程学院,北京100083 |
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| 基金项目： | 国家自然科学基金青年科学基金(41502264);高等学校博士学科点专项科研资金(20130023120016);中央高校基本科研业务费专项资金(2010QL07);中国矿业大学(北京)大学生创新训练(C201606012) |
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| 摘 要： | 吸水是导致岩石尤其是含黏土软岩变形乃至破坏的最重要的诱因之一.本文通过对采自国内三个不同矿区的若干深部软岩样品进行气态水吸附实验,得到了三组不同类型岩石的气态水吸附曲线;通过对吸水曲线进行回归拟合建立了各类岩石的吸水特征函数,对比分析得出岩石的气态水吸附随时间的动态变化规律.此外,结合X射线衍射实验、扫描电镜实验及压汞实验,得到了岩样的矿物组成、微观结构及孔隙率、孔隙分形维数等重要参数,综合分析了各因素对岩样气态水吸附特性的影响.研究结果表明,三种岩石样品气态水吸附随时间动态变化均表现为减速吸水过程,并可以用负指数函数进行拟合.三种岩样吸水能力差异显著,按大小排序依次为:大强砾岩＞沙吉海泥岩＞哈拉沟砂岩.黏土矿物成分的含量越高,岩石的吸水率、吸水速率就越大;而黏土矿物成分中,蒙脱石又对岩石吸水起到至关重要的作用.岩样的有效孔隙率越大,其吸附气态水的能力越强;岩样的有效孔隙结构越复杂,其吸附气态水的能力越弱.
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| 关 键 词： | 煤层沉积岩 气态水吸附 黏土矿物 微观结构 有效孔隙率 |
| 收稿时间： | 2016-09-04 |
Experimental study on water vapor absorption of rock and its influencing factors |
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| Affiliation: | 1.State Key Laboratory for GeoMechanics and Deep Underground Engineering,Beijing 100083,China;2.School of Mechanics and Civil Engineering,China University of Mining and Technology,Beijing 100083,China |
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| Abstract: | Water absorption is one of the most important factors which can induce serious rock deformation and failure.Water vapor absorption experiments were carried out on rock samples collected from three different coal mines.Meanwhile,the mineral components,microstructure features and pore structure parameters were determined by means of X-ray diffraction,scanning electron microscopy and mercury intrusion porosimetry in order to comprehensively analyse the effects of clay minerals and micropore structure on water vapor absorption of the investigated rock samples.Results have shown that the patterns of the water vapor absorption curves of the three types of rocks were all characterized by a similar kind of dynamic process with decreasing water vapor absorption rate which could be well fitted by a negative exponential function.However,significant differences were found in water vapor absorption ability among the three types of rock samples which could be sorted in an order of Daqiang conglomerate > Shajihai mudstone > Halagou sandstone.Furthermore,the greater abundance of clay minerals contained in rock samples,especially smectite,the more and quicker water vapor absorption.Meanwhile,water vapor absorption is positively correlated with effective porosity,but is negatively correlated with fractional dimension which indicates that the bigger the effective porosity the greater the water vapor absorption ability and the more complicated the pore structures the weaker the water vapor absorption ability. |
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