文献类型：期刊文献

英文题名：Study on the small strain dynamic characteristics and microscopic mechanism of nano-silica modified lime soil

作者：Wang, Wei[1];Wu, Hongxiang[1];Feng, Tianhong[1];Jiang, Ping[1];Sun, Miaomiao[2];Yang, Song[3];Liu, Yong[4];Li, Na[1];Song, Yifang[1]

机构：[1]Shaoxing Univ, Shaoxing Key Lab Interact Soft Soil Fdn & Bldg Str, Sch Civil Engn, Shaoxing 312000, Peoples R China;[2]Hangzhou City Univ, Dept Civil Engn, Hangzhou 310015, Peoples R China;[3]Beibu Gulf Univ, Coll Civil Engn & Architecture, Qinzhou 535011, Peoples R China;[4]Wuhan Univ, State Key Lab Water Resources Engn & Management, Wuhan 430072, Hubei, Peoples R China

年份：2025

卷号：37

起止页码：851

外文期刊名：JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T

收录：SCI-EXPANDED(收录号：WOS:001514452000006)、、WOS

基金：This work is supported by National Natural Science Foundation of China (52179107) and National Natural Science Foundation of China (52479104) .

语种：英文

外文关键词：Nano-silica; Lime soil; Small strain dynamic characteristics; Dynamic shear modulus; Damping ratio

外文摘要：Nano-silica (NS) possesses the characteristics of high specific surface area, high chemical activity and nanoscale dimensions. Incorporating an appropriate amount of NS into lime soil not only enhances its mechanical properties, but also contributes to resource conservation and environmental protection. This study investigates the small strain dynamic characteristics of nano-silica modified lime soil (NSLS) through resonant column test and examines its microscopic mechanism and pore changes by SEM, EDS, XRD, FTIR and MIP. The research findings indicate that with increasing confining pressure and curing age, the dynamic shear modulus G of NSLS gradually increases, while the damping ratio D gradually decreases. Furthermore, the fitting results from the HardinDrnevich model demonstrate that under different confining pressures, adding 0.4 % NS to lime soil yields the most significant improvement in stiffness, with the maximum dynamic shear modulus Gmax increasing by 34 %- 45 % and the maximum damping ratio Dmax decreasing by 20 %-30 %. Additionally, SEM, EDS, XRD, FTIR and MIP test results reveal that NS promotes the generation of more hydration products in NSLS, which helps to reduce its porosity. In summary, this study illustrates how NS can enhance both mechanical properties and microstructure of lime soil while providing scientific evidence for its application in practical engineering.