引用本文:张华杰,韩尚宇,蒋敏敏,洪宝宁.NaCl侵蚀环境下水泥土的宏微观特性分析[J].水利水运工程学报,2012,(2):49-54
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NaCl侵蚀环境下水泥土的宏微观特性分析
张华杰1,韩尚宇2,蒋敏敏3,洪宝宁4
1. 江苏省交通科学研究院有限公司,江苏南京,210017
2. 南昌航空大学土木建筑学院,江西南昌,330063
3. 河南工业大学土木建筑学院,河南郑州,450052
4. 河海大学岩土工程研究所,江苏南京,210098
摘要:
通过宏微观室内试验相结合的方法,探讨了NaCl侵蚀环境下水泥土的宏微观性能的变化规律,并从微观角度分析了其抗剪性能变化的内在机理.结果表明:在侵蚀过程中,水泥土内部结构遭到侵蚀,不同侵蚀龄期下结构单元体的形状、排列形式及孔隙的发育是不同的,总体而言,颗粒的定向度、紧密程度越来越差,孔隙数目越来越多,结构骨架越来越松散;微结构参数颗粒形状度、不均匀系数及欧拉数呈下降趋势,颗粒分布分维呈上升趋势;抗剪强度出现"波折、振荡"现象,但总体上呈下降趋势;通过回归分析建立了抗剪强度指标与微结构参数间的分析模型,完善了水泥土宏微观性能的研究.
关键词:  水泥土  NaCl侵蚀环境  抗剪强度指标  微结构  内在机理
DOI：
分类号:TV443.9
基金项目:国家自然科学基金
An analysis of the macro-and-micro properties of cement-soil under NaCl erosion environment
ZHANG Hua-jie1,HAN Shang-yu2,JIANG Min-min3,HONG Bao-ning4
1.Jiangsu Transportation Research Institute Co.,Ltd.,Nanjing 210017,China;2.College of Engineering and Architecture,Nanchang Hangkong University,Nanchang 330063,China;3.School of Civil Engineering and Architecture,Henan University of Technology,Zhengzhou 450052,China;4.Research Institute of Geotechnical Engineering,Hohai University,Nanjing 210098,China)
Abstract:
The law of change in the macro-and-micro properties of cement-soil under NaCl erosion environment is studied through macro-and-micro laboratory tests,and the internal mechanism of the macro shear-properties is analysed.The results show that the microstructure of cement-soil suffered erosion in the erosive course of NaCl,and that the shape and order form of structure units and the development of pore were different under different erosion ages.With the growth of immersion time,the orientation degree and tightness of grain got worse,the number of pore got more and the skeleton structure got looser.The shape-degree,uniform coefficient and Euler number of particle showed decline,and the fractal distribution of particle became ascendent.The change of macro-strength parameters showed "twists and turns,vibration",but ascendent in general.Regressive models for the relations between macro-strength parameters and parameters of microstructure were established through regressive analysis,which improved the study of macro-and-micro properties of cement-soil.
Key words:  cement-soil  NaCl erosion environment  macro-strength parameter  microstructure  internal mechanism
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