土工基础

土工基础 ›› 2025, Vol. 39 ›› Issue (4): 653-657.

• 测试技术 • 上一篇    下一篇

基于孔压静力触探预测软弱土压缩指数研究

陈 凯1，林 军2,3，闫 超1,3，魏明俐4   

  1. （1．安徽建筑大学土木工程学院，合肥 230601；2.江苏开放大学建筑工程学院，南京 210036；
    3.安徽省智能地下探测技术研究院，合肥 230601；4.中国科学院武汉岩土力学研究所岩土力学与工程国家重点实验室，武汉 430071）
  • 收稿日期:2023-06-28 修回日期:2023-07-24 出版日期:2025-08-31 发布日期:2025-08-27
  • 作者简介:陈凯（2001-），男，硕士研究生，研究方向为现代原位测试技术。
  • 基金资助:
    国家自然科学基金基金项目（51908250）；江苏省高校自然科学基金面上项目（19KJB560011）

Estimation of Compression Index of Soft Soils Using Cone Penetration Test with Piezocones

CHEN Kai1, LIN Jun2,3, YAN Chao1,3, WEI Mingli4   

  1. (1.School of Civil Engineering, Anhui Jianzhu University, Hefei 230601;
    2.School of Architecture and Civil Engineering, Jiangsu Open University, Nanjing 210036;
    3.Anhui Institute of Intelligent Underground Detection Technology, Anhui Jianzhu University, Hefei 230601;
    〖JP4〗4.State Key Laboratory for Geomechanics and Geotechnical Engineering, Institute of Rock and Soil Mechanics, Chinese Academy of Sciences, Wuhan 430071)
  • Received:2023-06-28 Revised:2023-07-24 Online:2025-08-31 Published:2025-08-27

摘要： 土的压缩指数Cc评估对土体的沉降有着重要意义,会对基础的大小和尺寸设计产生影响。分析了孔隙比e、含水率wn、液限wL三个土的物理参数和Cc之间的相关性并提出了经验公式，结果表明，孔隙比e、含水率wn、液限wL和Cc间具有良好的相关性，决定系数分别为0.837 5、0.823 3、0.691。同时，重点关注孔压静力触探（CPTU）现场原位测试技术，根据获取的南京市某经济住房项目的CPTU试验数据，结合土工实验数据，对土的压缩指数Cc进行了分析，评估了静力触探预测Cc的准确度。结果表明，锥尖阻力qc可以有效预测Cc，不同土层的压缩因αm取值不同（黏土＞粉质黏土＞砂土），当压缩因子αm确定时，通过预测公式可准确获得各土层的Cc参数，对各土层压缩性进行评估。

关键词: 孔压静力触探, 压缩指数, 孔隙比, 含水率, 液限

Abstract: The evaluation of compression index of soil is of great significance to the settlement of foundation soils which will have an impact on the size and dimensions of foundations. This paper analyses the correlations among three physical parameters of soil, namely void ratio, moisture content, and liquid limit. An empirical formula is then developed. The results show that there is a good linear relationship among the void ratio, moisture content, liquid limit, and compression index. Coefficient of Determination (R2) values are 0.837, 0.823 3, 0.691 0, respectively. At the same time, special attention is paid to the cone penetration test with pore water measurement (piezocone) method for the soft soil in-situ testing. Based on the piezocone data obtained from an economical housing project in Nanjing city, and combined with soil laboratory test data, the compression index of soil is analyzed and the accuracy of predicting it through the piezocone testing is evaluated. The results show that the cone tip resistance is correlated with the compression index, and the correlation coefficients of different soil layers vary (clay > silty clay > sandy soil). When the correlation coefficient takes a specific value, the compression index of each soil layer could be predicted accurately by a formula and the compressibility of each soil layer can be evaluated.

Key words: Piezocone Penetration Test, Compression Index, Vois Ratio, Moisture Content, Liquid Limit

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