侵蚀环境下水泥土微观结构分析
|
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.
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.
引文
[1] 龚晓南.复合地基理论及工程应用[M].北京:中国建筑出版社,2007.
[2] 宁宝宽,陈四利,刘斌.水泥土的环境侵蚀效应与破裂过程分析[J].岩石力学与工程学报,2005,24(10):1778-1782.
[3] 韩鹏举,白晓红,赵永强,等.Mg2+和SO相互影响对水泥土强度影响的试验研究[J].岩土工程学报,2009,39(1):72-76.
[4] 白晓红,赵永强,韩鹏举,等.污染环境对水泥土力学特性影响的试验研究[J].岩土工程学报,2007,29(8):1260-1263.
[5] 陈四利,宁宝宽,刘一芳,等.化学侵蚀下水泥土的无侧限抗压强度试验[J].新型建筑材料,2006(6):40-42.
[6] 刘泉声,柳志平,程勇,等.水泥土在侵蚀环境中的试验研究和等效分析[J].岩土力学,2013(7):1854-1860.
[7] 刘鑫,洪宝宁,陈艳丽,等.侵蚀环境下水泥土强度及微结构变化规律研究[J].武汉理工大学学报,2010(10):11-15.
[8] Russell S D.SEM observations on biological tissue section[J].Journal of Electron Microscopy Technique,1985,2(5):489-495.
[9] 柳志平.海水侵蚀环境下水泥土的力学性质试验研究及耐久性分析[D].武汉:武汉大学,2013.
[10] Media Cybemetics.Image-Pro Plus 6.0 for Windows[M].
[11] 王清,陈慧娥,蔡可易.水泥土微观结构特征的定量评价[J].岩土力学,2003(s1):12-16.
[12] 沈珠江,章为民.损伤力学在土力学中的应用[C]//全国岩土力学数值分析与解析方法讨论会,1988.
[2] 宁宝宽,陈四利,刘斌.水泥土的环境侵蚀效应与破裂过程分析[J].岩石力学与工程学报,2005,24(10):1778-1782.
[3] 韩鹏举,白晓红,赵永强,等.Mg2+和SO相互影响对水泥土强度影响的试验研究[J].岩土工程学报,2009,39(1):72-76.
[4] 白晓红,赵永强,韩鹏举,等.污染环境对水泥土力学特性影响的试验研究[J].岩土工程学报,2007,29(8):1260-1263.
[5] 陈四利,宁宝宽,刘一芳,等.化学侵蚀下水泥土的无侧限抗压强度试验[J].新型建筑材料,2006(6):40-42.
[6] 刘泉声,柳志平,程勇,等.水泥土在侵蚀环境中的试验研究和等效分析[J].岩土力学,2013(7):1854-1860.
[7] 刘鑫,洪宝宁,陈艳丽,等.侵蚀环境下水泥土强度及微结构变化规律研究[J].武汉理工大学学报,2010(10):11-15.
[8] Russell S D.SEM observations on biological tissue section[J].Journal of Electron Microscopy Technique,1985,2(5):489-495.
[9] 柳志平.海水侵蚀环境下水泥土的力学性质试验研究及耐久性分析[D].武汉:武汉大学,2013.
[10] Media Cybemetics.Image-Pro Plus 6.0 for Windows[M].
[11] 王清,陈慧娥,蔡可易.水泥土微观结构特征的定量评价[J].岩土力学,2003(s1):12-16.
[12] 沈珠江,章为民.损伤力学在土力学中的应用[C]//全国岩土力学数值分析与解析方法讨论会,1988.
© 2004-2018 中国地质图书馆版权所有 京ICP备05064691号 京公网安备11010802017129号 地址：北京市海淀区学院路29号 邮编：100083 电话：办公室：(+86 10)66554848；文献借阅、咨询服务、科技查新：66554700 |