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孔隙环境特征对高岭土超声波波速影响机理研究

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金李皓琳, 张敏, 苑成旺, 王占. 孔隙环境特征对高岭土超声波波速影响机理研究[J]. 水文地质工程地质, 2023, 50(5): 89-95. doi: 10.16030/j.cnki.issn.1000-3665.202209011
引用本文: 金李皓琳, 张敏, 苑成旺, 王占. 孔隙环境特征对高岭土超声波波速影响机理研究[J]. 水文地质工程地质, 2023, 50(5): 89-95. doi: 10.16030/j.cnki.issn.1000-3665.202209011
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JIN Lihaolin, ZHANG Min, YUAN Chengwang, WANG Zhan. Influence mechanism of pore environment characteristics on ultrasonic wave velocity of kaolin[J]. Hydrogeology & Engineering Geology, 2023, 50(5): 89-95. doi: 10.16030/j.cnki.issn.1000-3665.202209011
Citation: JIN Lihaolin, ZHANG Min, YUAN Chengwang, WANG Zhan. Influence mechanism of pore environment characteristics on ultrasonic wave velocity of kaolin[J]. Hydrogeology & Engineering Geology, 2023, 50(5): 89-95. doi: 10.16030/j.cnki.issn.1000-3665.202209011
shu

孔隙环境特征对高岭土超声波波速影响机理研究

  • 吉林大学建设工程学院，吉林 长春　130015

  • 基金项目: 吉林省自然科学基金项目（20220101166JC）
详细信息
    作者简介: 金李皓琳（1999-），女，硕士研究生，主要从事岩土体力学性质研究。E-mail：jlhl21@mails.jlu.edu.cn
    通讯作者: 张敏（1986-），女，博士，副教授，主要从事地质灾害防控及岩土体力学分析研究。E-mail：minzhang@jlu.edu.cn

  • 中图分类号: TU442

Influence mechanism of pore environment characteristics on ultrasonic wave velocity of kaolin

  • College of Construction Engineering, Jilin University, Changchun, Jilin　130015, China

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    摘要

  • 高岭土是工程中常见的黏性土体，其微观结构对孔隙环境的变化十分敏感。目前针对高岭土孔隙环境特征与声波波速关系的研究还有待深入。基于超声波测试理论，采用RSM-SY6超声波检测仪，研究了不同孔隙环境条件下，高岭土超声波波速的变化规律，并从黏土颗粒的排列方式及其与孔隙溶液的相互作用等微观角度，分析了孔隙环境特征对高岭土超声波波速的影响机理，为超声波检测技术在土体中的应用提供了一定的理论依据。结果表明：（1）孔隙比越大，高岭土超声波波速越低；（2）随着含水率的增加，高岭土超声波波速先小幅度降低，后大幅度升高；（3）孔隙溶液酸碱度对高岭土超声波波速的影响与边缘等电pH值有关，当孔隙溶液pH值等于边缘等电pH值时，超声波波速最大；（4）盐分的加入使高岭土超声波波速降低，当盐溶液浓度在0～0.5 mol/L时，波速下降最快。相同阴离子条件下，高价阳离子对超声波波速的降低作用更明显。研究结果可为黏性土体声学特性研究提供参考，同时也为超声波检测技术在土体中的应用提供了 一定的理论依据。

    Kaolin is a common clay in engineering. The microstructure of kaolin is very sensitive to the change of pore environment. At present, the research on the relationship between pore environment characteristics and acoustic wave velocity of kaolin remains to be further studied. In this paper, based on the ultrasonic test theory, RSM-SY6 ultrasonic detector is used to study the change rule of ultrasonic wave velocity of kaolin under different pore environment conditions. In addition, the influence mechanism of pore environment characteristics on ultrasonic wave velocity of kaolin is analyzed from the microscopic perspective of the arrangement mode of clay particles and the interaction between clay particles and pore solution. The results show that (1) the ultrasonic wave velocity of kaolin decreases with the increasing void ratio. (2) With the increasing water content, the ultrasonic wave velocity of kaolin decreases slightly at first and then increases greatly. (3) The effect of pore solution pH value on ultrasonic wave velocity of kaolin is related to the edge isoelectric pH value. When the pore solution pH value is equal to the edge isoelectric pH value, the ultrasonic wave velocity is the maximum. (4) The addition of salt reduces the ultrasonic wave velocity of kaolin. When the concentration of saline solution ranges from 0 to 0.5 mol/L, the wave velocity decreases rapidly. Under the same anion condition, the high valence cation has a more obvious effect on the reduction of ultrasonic wave velocity. This paper provides a reference for the study of the acoustic characteristics of viscous soil, and also provides a theoretical basis for the application of ultrasonic detection technology in soil.

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  • 图 1  高岭土超声波波速测试

    Figure 1. 

    下载: 全尺寸图片 幻灯片

    图 2  高岭土超声波波速与孔隙盐溶液浓度的关系曲线

    Figure 2. 

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    图 3  高岭土黏土颗粒间的3种接触方式示意图

    Figure 3. 

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    表 1  高岭土孔隙比与超声波波速

    Table 1.  Void ratio and ultrasonic wave velocity of kaolin

    参数取值 孔隙比
    0.89 0.93 0.97 1.08 1.20 1.32
    波速/（km·s−1） 1.110 1.080 1.030 0.975 0.901 0.864
    下载: 导出CSV

    表 2  高岭土含水率与超声波波速

    Table 2.  Water content and ultrasonic wave velocity of kaolin

    参数取值 含水率/%
    3.41 8.93 14.50 21.20 23.40 27.63 33.72
    波速/（km·s−1） 1.210 1.030 0.897 1.003 1.178 1.531 1.977
    下载: 导出CSV

    表 3  高岭土孔隙溶液pH值与超声波波速

    Table 3.  Pore solution pH value and ultrasonic wave velocity of kaolin

    参数取值 pH值
    1 2 3 4 5 6 7 8 9 10 11 12
    波速/（km·s−1） 1.010 1.017 1.028 1.036 1.040 1.035 1.032 1.028 1.027 1.017 0.980 0.970
    下载: 导出CSV
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收稿日期:  2022-09-06
修回日期:  2022-12-29
刊出日期:  2023-09-15

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