利用原子力显微镜探针刺入测试黏土颗粒水化膜厚度的试验研究  

An experimental study of the measuring hydration film thickness of clay particles with atomic force microscope probe

作　　者：郭永春 屈智辉 许福周 周相贵 GUO Yongchun;QU Zhihui;XU Fuzhou;ZHOU Xianggui(Faculty of Geosciences and Environmental Engineering,Southwest Jiaotong University,Chengdu,Sichuan 610031,China;China Railway Water Conservancy and Hydropower Planning and Design Group Co.Ltd.,Nanchang,Jiangxi 330029,China;Guangzhou Holding Company of the China Railway Siyuan Survey and Design Group Co.Ltd.,Guangzhou,Guangdong 510600,China)

机构地区：[1]西南交通大学地球科学与环境工程学院,四川成都610031 [2]中铁水利水电规划设计集团有限公司,江西南昌330029 [3]中铁四院集团广州设计院有限公司,广东广州510600

出　　处：《水文地质工程地质》2021年第6期105-112,共8页Hydrogeology & Engineering Geology

摘　　要：黏土颗粒水化膜厚度问题是泥质膨胀性岩土膨胀机制研究的理论基础。关于黏土颗粒水化膜厚度测试资料较为丰富,但通过原子力显微镜测试黏土颗粒水化膜厚度的研究成果还较为少见,且在测试方法方面尚不完善。基于3层水化膜结构模型和原子力显微镜测试技术,通过对蒙脱石粉末、泥岩粉末、泥岩岩片3种样品的测试研究,提出了水化膜厚度刺入式测试方法、粉末样和岩石样的制样方法、试验数据的统计处理方法。总结了水化膜厚度测试曲线自由水段、弱结合水段、强结合水段、黏土颗粒段的变化规律。通过和既有研究成果的对比分析,论证了原子力显微镜刺入测试黏土颗粒水化膜厚度的合理性与可行性。结合工程实践,探讨了定量化获取水化膜厚度在理解泥质膨胀性岩土膨胀机制方面的工程意义和理论价值。The thickness of hydration film of clay particles is the theoretical basis of swelling mechanism of argillaceous expansive rock and soil.There are abundant data on the measurement of clay particle hydration film thickness,but the study of the measurement of clay particle hydration film thickness by atomic force microscopy is relatively rare,and the test method is not perfect.Based on the three-layer hydration membrane structure model and atomic force microscope test technology,through the test and research on montmorillonite powder,mudstone powder and mudstone rock slice,this paper puts forward the measurement method of the thickness of the hydration film,the preparation method of powder sample and rock sample,and the statistical processing method of the test data.The variation rules of the free water section,weakly bound water section,strong bound water section and clay particle section of the hydration film thickness test curve are summarized.Through comparative analyses with the existing research results,the rationality and feasibility of the testing the thickness of the hydration film of clay particles by the atomic force microscope is demonstrated.Combined with engineering practice,the engineering significance and theoretical value of the quantitatively obtaining the hydration film thickness in understanding the swelling mechanism of the argillaceous expansive rock and soil are discussed.

关 键 词：水化膜厚度 黏土颗粒 原子力显微镜 刺入测试方法 泥质膨胀性岩土 

分 类 号：P642.13[天文地球—工程地质学] TU443[天文地球—地质矿产勘探]