文献类型：期刊文献

中文题名：纳米粘土的微观结构与直剪力学特性及应用研究

英文题名：Micro-structure and Direct Shear Performance of Nanoclay and Its Application

作者：傅克贤[1];李元[1];姜屏[1];方初蕾[1];张芳[1];王伟[1]

机构：[1]绍兴文理学院土木工程学院

年份：2019

卷号：39

期号：7

起止页码：19

中文期刊名：绍兴文理学院学报

收录：国家哲学社会科学学术期刊数据库

基金：国家自然科学基金资助项目"纳米材料改性滨海水泥土的小应变特性与微观机理"(41772311);浙江省自然科学基金资助项目"纳米材料改性水泥土真三轴应力应变特性研究"(LY17E080016);浙江省建设科研资助项目"纤维材料改性滨海水泥土的力学性质研究与应用"(2017K179)

语种：中文

中文关键词：纳米粘土;直剪试验;微观结构;抗剪强度

外文关键词：nanoclay;direct shear;microstructure;shear strength

中文摘要：为了探索纳米粘土的力学性能及作用机理,分别进行了纳米粘土、纳米粘土改性尾矿砂的直接剪切力学试验.采用SEM、XRD、EDX测试方法,测试表明,试验使用纳米黏土的主要成分为二氧化硅和氧化铝,结构密实,呈粒状堆积结构.直剪力学测试表明:(1)纳米粘土的剪切应力-位移曲线为软化型曲线;(2)法向应力增加时,纳米黏土的峰值强度线性增加,但其对应的剪切变形相应减少;(3)纳米粘土的峰值强度和残余强度均符合莫尔-库伦准则,残余强度约为峰值强度的60%～70%;(4)加入10%纳米粘土后,尾矿砂的抗剪强度大幅提高.纳米粘土的微观结构和优良的直剪力学性能为其在岩土工程中的应用提供了可能.

外文摘要：In order to explore the mechanical properties and mechanism of nanoclay, microscopic characterization and direct shear tests were carried out. The microscopic characteristics were revealed by SEM, XRD and EDX test methods. Direct shear mechanical tests on nanoclay, iron tailing powder and nanoclay reinforced iron tailing powder were conducted under five normal stresses. The microscopic tests demonstrate that the main components of the test nanoclay are SiO2 and Al2O3, which are densely packed with a granular packing structure. The mechanical tests show as follows:(1)the shear strength displacement curve of nanoclay is a softening curve;(2)when the normal stress increases, the peak strength increases linearly, but the corresponding shear deformation decreases accordingly;(3)the peak strength and residual strength of nanoclay conform to Mohr Coulomb criterion, and the residual strength is about 60%~70% of the peak intensity;(4)adding 10% nanoclay can greatly enhance the shear strength of iron tailing powder. The microstructure and excellent direct shear mechanical properties of nanoclay enable its application in geotechnical engineering.