离子型土固化材料对膨胀土的加固机理试验研究.docxVIP

第 26 卷 第 10 期2009 年 10 月公 路 交 通 科 技Journal of Highway and Transportation Research and DevelopmentVol1 26No1 10Oct1 2009文章编号 : 1002Ο0268(2009) 10Ο0006Ο05离子型土固化材料对膨胀土的 加固机理试验研究汪益敏 , 刘小兰 , 陈页开 , 李庆臻 , 杨丽珍(华南理工大学 土木与交通学院 , 广东 广州 510640)摘要 : 采用离子型土固化材料对广西南宁膨胀土进行化学加固 , 通过试验获得不同配合比加固土的化学成分 、阳离子交换量和比表面积 , 对加固土的物理化学性质等进行表征 。同时利用扫描电镜观察加固土的微观形貌 , 并试验测试加 固土的膨胀性和强度特性 , 探讨离子型土固化材料对膨胀土的加固机理 。结果表明 : 离子型土固化材料使得膨胀土的 阳离子交换能力和比表面积显著降低 , 土对水的吸附能力减小 , 土的结构稳定性得到增强 ; 离子型土固化材料与石灰 共同作用 , 使得膨胀土的层状结构形式改变为粒状结构 , 土粒之间的联结增强 , 土Ο水之间的相互作用体系发生改变 , 土的胀缩总率和塑性指数明显减小 , 土的强度和水稳定性得到有效的提高 。关键词 : 道路工程 ; 加固机理 ; 离子型土固化材料 ; 膨胀土中图分类号 : TU47215文献标识码 : AExperiment of Strengthening Mechanism of Swelling Soil Using ISSWANG Yimin , L IU Xiaolan , CHEN Yekai , LI Qingzhen , YANG Lizhen (School of Civil Engineering and Transportation , South China University of Technology , GuangzhouGuangdong510640 , China)Abstract : Ionic soil stabilizer was used to strengthen the swelling soil of Nanning , Guangxi Province1Chemical composition , cation exchange capacity , and specific surface area were obtained from a series of tests to characterize the physical and chemical performance of the stabilized soils with different mixing ratios1Moreover , the microstructure of stabilized soils was observed from microscope , and the features of expansibility and strength were investigated through tests to find out strengthening mechanism of swelling soil by using ISS1It is found that (1) the cation exchange capacity and specific surface area of swelling soil can be significantly decreased , the absorbability of soil to water can be decreased and the structural stability ofsoil can be increased by using ISS ;( 2) themicrostructure of swelling soil can be changed from layered structure to grainy one by adding a certain dosage of ISS and lime into it , which result in the reinforced connection between soil particles , the variation of absorption between soil and