土工基础

土工基础 ›› 2026, Vol. 40 ›› Issue (3): 546-551.

• 测试技术 • 上一篇    下一篇

粉-黏混合土黏粒含量和饱和度对纵波速度的影响

单洋洋1，时 伟1，孟祥梅2，杨忠年1，胥正一1，凌贤长1,3   

  1. （1.青岛理工大学 土木工程学院，山东青岛 266033；2.自然资源部第一海洋研究所，山东青岛 266061；3.哈尔滨工业大学 土木工程学院，哈尔滨 150001）
  • 收稿日期:2024-03-13 修回日期:2024-04-07 出版日期:2026-06-30 发布日期:2026-06-25
  • 作者简介:单洋洋（1998-），女，硕士研究生，研究方向为特殊土力学。
  • 基金资助:
    国家自然科学基金(42177153)

Influence of Clay Content and Saturation on P-wave Velocity of Silt-Clay Mixture

SHAN Yangyang1, SHI Wei1, MENG Xiangmei2, YANG Zhongnian1, XU Zhengyi 1, LING Xianzhang1,3   

  1. (1.Department of Civil Engineering, Qingdao University of Technology, Qingdao 266033;
    2.First Institute of Oceanography, MNR, Qingdao 266061;
    3.Department of Civil Engineering, Harbin Institute of Technology, Harbin 150001)
  • Received:2024-03-13 Revised:2024-04-07 Online:2026-06-30 Published:2026-06-25

摘要： 通过室内试验对不同黏粒含量（CC）的粉黏混合土的声学特性进行研究，探讨黄河三角洲地区粉黏混合土黏粒含量与饱和度对纵波速度的影响。研究结果表明：粉黏混合土中黏粒含量会阻碍纵波在土中传播，在完全饱和状态下，激励信号频率越高，纵波速度越大。当试样处于近饱和状态时，若黏粒含量达到20%、40%，纵波速度的变化率不同，且黏粒含量越高，对纵波速度的影响越大。导致此现象出现的原因与孔隙率有关，在这里孔隙率随着黏粒含量的增加而非线性递增，在黏粒含量达到20%、 40%时，孔隙率的变化率也随黏粒含量的增加而增加。孔隙率变化与填充于孔隙中的黏粒有关，利用ThomasStieber模型分析黏粒在空间上的分布，从微观角度分析不同黏粒含量下黏粒在孔隙中的存在形式。

关键词: 黄河三角洲, 纵波速度, 黏粒含量, 饱和度, Thomas-Stieber模型

Abstract: The study investigates the acoustic properties of siltclay mixed soils with different clay-particle contents (CC) from a geomechanical perspective through laboratory testing, focusing on how clay content and saturation influence P-wave velocity in the Yellow River Delta. The results show that increasing clay-particle content hinders P-wave propagation in the soil. Under fully saturated conditions, higher excitation frequencies correspond to higher P-wave velocities. When specimens are in a near-saturated state, the rate of change in P-wave velocity differs when clay contents reach 20% and 40%, and higher clay content produces a stronger influence on P-wave velocity. This phenomenon is related to porosity, which increases nonlinearly with clay content; at 20% and 40% clay content, the rate of porosity change also increases. Variations in porosity are associated with the distribution of clay particles within the pore space. The Thomas-Stieber model is used to analyze the spatial distribution of clay, providing a microscopic interpretation of how clay exists within pores at different clay-particle contents.

Key words: Yellow River Delta, P-Wave Velocity, Viscous Grain Content Threshold, Saturation, ThomasStieber Model

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