侵蚀环境下水泥土微观结构分析  

Analysis on micro-structure of cement soil under erosion condition

作　　者：魏莱 陈晓昱[3] WEI Lai;CHEN Xiaoyu(Changjiang Institute of Survey Planning Design and Research,Wuhan 430010,China;State Key Laboratory of Geomechanics and Geotechnical Engineering,Institute of Rock and Soil Mechanics,Chinese Academy of Sciences,Wuhan 430071,China;Wuhan Land Use and Urban Spatial Planning Research Center,Wuhan 430014,China)

机构地区：[1]长江勘测规划设计研究有限责任公司,湖北武汉430010 [2]中国科学院武汉岩土力学研究所岩石力学与工程国家重点实验室,湖北武汉430071 [3]武汉市土地利用和城市空间规划研究中心,湖北武汉430014

出　　处：《人民长江》2019年第5期166-170,共5页Yangtze River

摘　　要：水泥土因其具有性能优良、施工便捷等优点,被广泛地应用于各类岩土工程中。但在实际工程中,复杂的外部环境侵蚀将导致其结构损伤,承载能力降低,特别是在滨海环境下,侵蚀性离子将严重影响水泥土的固化反应。制作了水泥土试件,并配置化学侵蚀液模拟滨海环境侵蚀过程。试验中利用扫描电子显微镜进行观测,获得了不同侵蚀条件下水泥土的微观结构图像,定性探讨了水泥土的微观结构变化规律,并定量分析了水泥土微观结构参数。通过无侧限抗压试验,分析微观结构状态与宏观强度间的相关关系,探讨微观结构对宏观力学性质的控制机理。引入以颗粒面积比表示的损伤变量,通过微观结构参数来度量其力学性质的劣化程度。Cement-soil is widely used in all kinds of geotechnical engineering projects for its easy construction and good performance. But in actual project, the cement-soil often suffered erosion from external environment, especially in coastal area, which changes its micro-structure and deteriorates its mechanical properties and durability. Cement-soil samples were produced and chemical etchant was prepared to simulate coastal environment. The SEM was used to obtain the micro-structure image, and the characteristics of granules and porous under different erosion conditions were analyzed quantitatively. Furthermore, the correlations between micro-structure and macro-strength were studied, by which the controlling mechanisms of micro-structure on mechanical performance was discussed. Finally, the damage variable represented by particle area ratio was introduced to represent the damage level of mechanical performance.

关 键 词：水泥土 环境侵蚀 微观结构 损伤力学 岩土工程 

分 类 号：P642[天文地球—工程地质学]