Abstract

Nano bentonite is a new kind of soil modification material, which can effectively improve the physical and mechanical properties of clay. The development of new soil modification technology has been a research hotspot in geological engineering, geotechnical engineering and road engineering. The purpose of this study is to test and analyze the strength and consolidation characteristics of clay modified by nano bentonite, and to explore the new clay materials applied in modern geological engineering. In this study, an installation test was carried out on the preparation of nano bentonite, and the compressive condition of the bentonite was observed. After that, the viscosity strength of nano bentonite was compared with that of undisturbed soil by the control variable method, and the nano bentonite was divided into experimental group and control group. The viscosity strength and consolidation characteristics of nano bentonite were observed and analyzed by changing temperature, nano bentonite content, pressure and pore ratio. The results show that the consolidation coefficient of the sample without adding nano bentonite is 8.7 × 10^–3 cm²/s, which is 6.6 × 10^–3 cm²/s lower than that of 2% nano bentonite. It shows that the consolidation coefficient decreases with the increase of consolidation pressure and the decrease of void ratio. The nano bentonite modified clay is also more stable in road or building construction. The method of this study has brought a certain value for the research of nano materials in soil materials.

摘要

纳米膨润土是一种新型土壤改性材料，可有效改善粘土的物理力学性能。开发新的土壤改性技术一直是地质工程、岩土工程和道路工程的研究热点。本研究的目的是测试和分析纳米膨润土改性粘土的强度和固结特性，探索应用于现代地质工程的新型粘土材料。本研究对纳米膨润土的制备进行了安装试验，观察了膨润土的压缩情况。之后，采用控制变量法比较纳米膨润土与原状土的黏度强度，将纳米膨润土分为实验组和对照组。通过改变温度、纳米膨润土含量、压力和孔隙比，观察和分析了纳米膨润土的粘度强度和固结特性。结果表明，未添加纳米膨润土的试样固结系数为8.7×10^–3 cm ² /s，比2%纳米膨润土低6.6×10 ^–3 cm ² /s。表明固结系数随着固结压力的增大和孔隙率的减小而减小。纳米膨润土改性粘土在道路或建筑施工中也更稳定。本研究方法为土壤材料中纳米材料的研究带来了一定的价值。