【作者】 罗逸； 李平； 匡健； 郭稚弧； 冯晓腊； 聂良佐； 张慧；

【Author】 Luo Yi,Li Ping,Kuang Jian,Guo Zihu (Dept.of Chem.and Dept.of mechanics,Huazhong university of Science and Technology,WuHan 430074) Feng Xiaola,Nie Liangzuo,Zhanghui (Dept.of Hydrogeology and Engineering Geology,China university of Geosciences,Wuhan 430074)

【机构】 华中理工大学化学系； 中国地质大学水文系；

【摘要】 本文对化学方法处理膨胀岩土,改变其工程地质特性的影响进行了初步的考察和研究。微观分析,土壤物性及土力学实验结果表明,某些经合成获得的有机阳离子化合物对抑制膨胀岩土的胀缩性,提高土体的抗剪强度,降低其压缩性和含水量以及改善其透水性具有较好的效果。更多还原

【Abstract】 Establishment of a technology for improving geological characteristics of expansible clay which might bring about dangers to civil engineering is urgent in bydrogeology and geology engineering.Owing to swell-shrink characteristics of expansible clay minerals,a lof of serious accidents take place,eg:The cracking landslide and collapse have frequently occurred in building,roadbed and canal.At present the technology of improving of clay minerals in ciyil,hydrogeology and geology engineerings by means of chemical methods stand still far from practical use.However, it is unjustified because chemical methods have some unique advantages over the traditional ones as to diversity, ease of operation,low cast etc. In this paper,we have studied characters and action mechanism of some organic and inorganic cationic compounds with x-ray diffraction scanning,electron microscopic technology and geology engineering experiments. The x-ray diffraction results have been shown that organic and inorganic compound vary the gap of the montmorillonite crystal face from 15.8(?) to 14.7(?),this indicates that chemical compound inhibit hydration and swelling of clay minerals. The scaning electron microscopic results have been shown that chemical compound inhibit dispersion of clay minerals. The experiment results have been shown that chemical treating expansible clay leads to improvement of properties, changse free expansion rate from 176.9%to 38.5%,expansion force from 0.26 to 0.18(kg/cm~2),compressibility factor from 0.47 to 0.35,modulus of compress from 6.30 to 7.40,and cohesive force from 5.6kPa to 14.4kPa,.water content from 52.9%to 35.0%. These suggest the feasibility that the geological charateristic of expansible clay is improved by chemical methods. This study contruibutes to establishment the technology to improve and control the geological characteristic of clay minerals by chemical method.更多还原