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纳米硅溶胶加固粉质砂土的性能研究
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作者单位:

1.佛山科学技术学院,广东 佛山 528000;2.长安大学,陕西 西安 710064

作者简介:

陈林生,硕士研究生,研究方向为岩土力学与地下结构工程,E-mail:1078687220@qq.com。

中图分类号:

TU441


Study on the Properties of Nano-Silica Sol for Strengthening Silty Sand
Author:
Affiliation:

1.Foshan University,Fo’shan 528000;2.Chang’an University,Xi’an 710064

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    摘要:

    粉质砂土具有富含微细孔隙的特点,导致对其进行注浆加固较为困难。在传统注浆加固材料的基础上,引入纳米硅溶胶,研究纳米硅溶胶对粉质砂土加固的影响。以纳米硅溶胶加固粉质砂土为研究对象,通过注浆效果对比试验、无侧限抗压强度实验、渗透实验、SEM扫描电镜分析等试验方法,比较不同养护环境及龄期加固土力学性能。结果表明:纳米硅溶胶注浆性能相对与传统注浆材料能快速有效地渗入土体对土粒进行胶结,对孔隙进行封堵。通过设置干燥空气和水两种养护环境养护后进行相应力学试验及抗渗冲刷试验,结果发现:当填充率为25%时,纳米硅溶胶加固土强度最大可提高至280—290 kPa,连续水流冲刷下抗渗时间扩展至340 h。此外,比较不同养护环境及龄期的加固土组成成分及结构特征发现,水养护下加固土结构更为完整,孔隙更少。因此,纳米硅溶胶在富水地区对加固粉质砂土具有更大的优势。

    Abstract:

    Silty sand has the characteristic of being rich in micro pores, which makes it more difficult to reinforce it by grouting. Based on the traditional grouting reinforcement material, nano-silica sol was introduced to analyze the feasibility for reinforcement of silty sand. In this paper, the physical and mechanical properties of reinforced soil under different conditions were compared by using laboratory test methods such as comparative test of grouting effect of different materials, unconfined compression strength experiment, permeation experiment and SEM scanning electron microscope analysis. The results showed that the nano-silica sol grouting can quickly and effectively penetrate into the soil to cement the soil particles and seal the pores compared with traditional grouting materials. After the curing in both dry air and water environments, the mechanical experiments and seepage scouring experiments were carried out. When the filling rate was 25%, the strength of nano-silica sol reinforced soil increased to 280—290 kPa, and the seepage resistance time was extended to 340 h under continuous water scouring. By comparing the compositions and structural characteristics of reinforced soils in different curing environments and ages, it found that the structure of reinforced soils was more complete and less porous under water curing, so the nano-silica sol had a greater advantage in water-rich areas.

    表 2 不同注浆材料脱模后效果对比Table 2 Comparisons of the qualities of different grouting materials after demoulding
    图1 土-水特征曲线Fig.1 Soil-water characteristic curve
    图2 改性纳米硅溶胶粘度随时间变化曲线Fig.2 The viscosity vs time curve of the modified nano-silica sol
    图3 渗透系数测定装置Fig.3 Schematic diagram of the measuring device for permeability coefficient
    图4 不同注浆材料效果对比图Fig.4 Comparisons of the qualities of different grouting materials
    图5 不同养护条件下加固土抗压强度Fig.5 Compressive strengths of the reinforced soil under different curing conditions
    图6 不同纳米硅填充率下加固土抗压强度Fig.6 Compressive strengths of the reinforced soil with different nano-silicon filling rates
    图7 不同养护条件下加固土孔隙率变化Fig.7 Variations of the porosity levels of the reinforced soil under different curing conditions
    图8 不同养护条件下加固土渗透系数变化曲线Fig.8 Permeability coefficient curves of the reinforced soil under different curing conditions
    图9 空气养护下不同时间点加固土微观形貌Fig.9 Microstructures of the soil reinforced at different time points under air curing
    图10 纯水养护下不同时间点加固土微观形貌Fig.10 Microstructures of soil reinforced at different time points under water curing
    表 1 粉质砂土基本物理性质Table 1 Basic physical properties of the silty sand used in this study
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引用本文

陈林生,郭家仪,李润铖,曾洋,程马遥.纳米硅溶胶加固粉质砂土的性能研究[J].材料研究与应用,2023,17(2):346-353.

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  • 收稿日期:2022-10-11
  • 在线发布日期: 2023-04-24
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