纳米黏土对复合土工材料力学性能的改性作用：水泥、纳米二氧化硅与滨海软土

Modification Effect of Nano-Clay on Mechanical Behavior of Composite Geomaterials: Cement, Nano-Silica and Coastal Soft Soil.

作者信息

Wang Yaying, Wang Wei, Zhao Yinuo, Li Na, Luo Jiale, Belete Asefa Mulugeta, Ping Jiang

机构信息

School of Civil Engineering, Shaoxing University, Shaoxing 312000, China.

出版信息

Materials (Basel). 2022 Dec 7;15(24):8735. doi: 10.3390/ma15248735.

DOI:10.3390/ma15248735

PMID:36556541

原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC9783058/

Abstract

To study the modification effect of nano-clay and nano-SiO on cement-reinforced coastal soft soil, the effects of the nano-SiO and nano-clay on the mechanical properties of cement soil were studied through unconfined compressive and unconsolidated undrained shear tests, and the Duncan-Chang model was used to fit the test results. Results show that adding nano-clay and nano-SiO to cement soil improved its compressive and shear strength. The compressive strength and shear strength increased by 18-57% and 3-32%, respectively, with the increase in nano-clay content in a content range of 0-10%. Additionally, nano-clay can enhance the ductility of cement soil. Moreover, nano-clay and nano-SiO improve the shear strength by increasing the internal friction angle by 1°-2° and cohesion of 9-25%, and the cement-stabilized coastal soft soil enhanced by nano-SiO and nano-clay conforms to the Duncan-Chang model well.

摘要

为研究纳米黏土和纳米二氧化硅对水泥加固滨海软土的改性效果，通过无侧限抗压试验和不固结不排水剪切试验，研究了纳米二氧化硅和纳米黏土对水泥土力学性能的影响，并采用邓肯-张模型对试验结果进行拟合。结果表明，在水泥土中添加纳米黏土和纳米二氧化硅可提高其抗压强度和抗剪强度。当纳米黏土含量在0-10%范围内增加时，抗压强度和抗剪强度分别提高了18%-57%和3%-32%。此外，纳米黏土可增强水泥土的延性。而且，纳米黏土和纳米二氧化硅通过使内摩擦角增加1°-2°、黏聚力提高9%-25%来提高抗剪强度，纳米二氧化硅和纳米黏土增强的水泥加固滨海软土与邓肯-张模型拟合良好。