黑色页岩遇水膨胀微观特征试验研究

doi:10.13722/j.cnki.jrme.2014.1147

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摘要

为研究黑色页岩遇水膨胀特性，开展不同浸水时间黑色页岩X衍射(XRD)、扫描电镜(SEM)、氮吸附孔径分布等微观试验，得到不同浸水时间条件下黑色页岩矿物成分、微观形貌、崩解特征、晶层间距及晶层膨胀力等膨胀特征微观变化规律。研究结果表明：黑色页岩遇水后，黏土化趋势显著，矿物组成中产生伊/蒙混层矿物；微观结构由较致密的片层状结构逐渐向不规则的团絮状结构过渡，并出现微观崩解现象；内部孔隙的孔径减小，微孔隙比例增加，出现黏土矿物的絮凝充填产生的0.3～2.0 μm的微孔隙；针对白云母、伊利石及伊/蒙混层、绿泥石3种典型片状结构矿物系列的001晶面层间距、晶层间膨胀力进行计算得到，白云母系列矿物晶层间距增长最大，晶层间膨胀力增长124.4%，达92 kPa；绿泥石系列矿物晶层间距增长次之，晶层间膨胀力增长111.8%，达72 kPa；伊利石及伊/蒙混层系列矿物晶层间距增长最小，膨胀力增长96.4%，为55 kPa。由此可见，晶层间膨胀作用力的增大会导致黑色页岩遇水容易产生崩解、软化。

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	朱宝龙1
	李晓宁1
	巫锡勇2
	王英杰1

关键词 ：岩石力学, 黑色页岩, 微观特征, 晶层间距, 晶层膨胀力, 微孔隙

Abstract：

In order to swelling characteristics of black shale，X-ray diffraction(XRD)，scanning electron microscope (SEM)，nitrogen adsorption test are carried out with different soaking time under the influence of water and mineral composition，microstructure，disintegration characteristics，crystal layer spacing and swelling force variation law of crystal layer on black shale are obtained. The research result shows that the trend of argillitization of black shale increases，and the illite/smectite interstratified clay minerals presents after water soaking. With the increase of saturated time，compact layer microstructure of black shale gradually changes to the irregular mass of flocculent structure，and micro-disintegration phenomenon appears. clay minerals content in black shale causes the floe hole，pore size of black shale decreases after soaking，and micro pore ratio increases；the clay minerals content of flocculation filled by 0.3–2.0 microns of micropores. Then，we specially select the interval and swelling force of (001) crystal layer among laminated structure series minerals，typically for the white mica，illite，chlorite and illite/smectite interstratified clay minerals，as calculation objects. The white mica series mineral crystal layer has the maximal interval growth as well as the swelling force of crystal layer has reach 92 kPa，an increase of 100%. The Chlorite series mineral crystal layer has the second interval growth. But the swelling force of crystal layer has an increase of 111.8%，up to 72 kPa. The Illite and illite/smectite interstratified clay minerals crystal layer has the smallest interval growth，in addition，the swelling force of crystal layer rose by 96.4%，up to 55 kPa.

Key words： rock mechanics black shale micro-characteristics spacing of crystal layer swelling force of crystal layer micropores

引用本文:

朱宝龙1，李晓宁1，巫锡勇2，王英杰1. 黑色页岩遇水膨胀微观特征试验研究[J]. 岩石力学与工程学报, 2015, 34(S2): 3896-3905.
ZHU Baolong1，LI Xiaoning1，WU Xiyong2，WANG Yingjie1. EXPERIMENTAL STUDY OF MICRO-CHARACTERISTICS OF SWELLING FOR BLACK SHALE UNDER INFLUENCE OF WATER. , 2015, 34(S2): 3896-3905.

链接本文:

https://rockmech.whrsm.ac.cn/CN/10.13722/j.cnki.jrme.2014.1147 或 https://rockmech.whrsm.ac.cn/CN/Y2015/V34/IS2/3896

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