岩土力学 ›› 2025, Vol. 46 ›› Issue (12): 3913-3923.doi: 10.16285/j.rsm.2025.0620CSTR: 32223.14.j.rsm.2025.0620

• 基础理论与实验研究 • 上一篇    下一篇

基于静力触探数据的滨海黏土应力历史与强度特性解译研究

代仲海1, 2，李裕成3，莫品强3, 4，位鑫宇3，蔡国军5   

  1. 1. 深圳地质科技创新中心，广东 深圳518078；2. 深圳地质建设工程公司，广东 深圳518078； 3. 中国矿业大学 力学与土木工程学院 深地工程智能建造与健康运维全国重点实验室，江苏 徐州 221116； 4. 中国矿业大学 深圳研究院，广东 深圳 518057；5. 安徽建筑大学 土木工程学院，安徽 合肥 230601
  • 收稿日期:2025-06-15 接受日期:2025-11-03 出版日期:2025-12-11 发布日期:2025-12-20
  • 通讯作者: 莫品强，男，1988年生，博士，副教授，博士生导师，主要从事岩土力学与工程的研究。E-mail: pinqiang.mo@cumt.edu.cn
  • 作者简介:代仲海，男，1984年生，博士，正高级工程师，主要从事滨海软土的勘察与科研工作。E-mail: 147246118@qq.com
  • 基金资助:
    国家自然科学基金（No.52178374，No.52578447）；广东省基础与应用基础研究基金（No.2024A1515011552）；江苏省自然科学基金（No.BK20242090）；深圳市科技计划（No.JCYJ20250604185223030）。

Interpretation of stress history and strength characteristics of coastal clay based on cone penetration testing data

DAI Zhong-Hai1, 2, LI Yu-cheng3, MO Pin-qiang3, 4, WEI Xin-yu3, CAI Guo-jun5   

  1. 1. Shenzhen Geological Technology Innovation Center, Shenzhen, Guangdong 518078, China; 2. Shenzhen Geological Construction Engineering Company, Shenzhen, Guangdong 518078, China; 3. State Key Laboratory for Intelligent Construction and Healthy Operation of Deep Underground Engineering, School of Mechanics and Civil Engineering, China University of Mining and Technology, Xuzhou, Jiangsu 221116, China; 4. Shenzhen Research Institute, China University of Mining and Technology, Shenzhen, Guangdong 518057, China; 5. School of Civil Engineering, Anhui Jianzhu University, Hefei, Anhui 230601, China
  • Received:2025-06-15 Accepted:2025-11-03 Online:2025-12-11 Published:2025-12-20
  • Supported by:
    This work was supported by the National Natural Science Foundation of China (52178374, 52578447), the Guangdong Basic and Applied Basic Research Foundation (2024A1515011552), the Natural Science Foundation of Jiangsu Province (BK20242090) and the Shenzhen Science and Technology Program (JCYJ20250604185223030).

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摘要： 我国华南滨海地区广泛分布低强度、高压缩性软黏土，其工程特性评价对工程建设至关重要。静力触探试验（cone penetration test，简称CPT）虽能高效获取土体参数，但数据解译存在地区差异性，现有方法的适用性亟待验证。以广东东莞及周边滨海黏土场地为研究对象，联合开展CPT原位测试、固结不排水三轴试验、固结快剪试验等，分析滨海黏土力学特性。根据东莞及其周边地区滨海软黏土的CPT试验，修正的土性指数IB可定量描述软黏土并用于土性分类；基于归一化锥尖阻力和修正土类指数对土层的应力历史进行初步评价，推荐采用Mayne和Robertson法相结合确定软黏土层的超固结比。基于固结不排水三轴试验和固结快剪试验结果，通过CPT数据解译得到的力学指标需要土工试验的结果进行修正；基于CPT数据解译得到了土体的状态参数与Robertson土性分类图结果一致；采用5种方法，分析场地的压缩模量，结果表明CPT解译的结果均处于规范推荐范围内，其中K-M1990法在滨海淤泥土层中表现出较高的准确性。研究成果为东南滨海软黏土的CPT数据解译提供了地区适应性优化方案，对工程勘察具有参考价值。

关键词: 滨海黏土, 静力触探试验, 超固结比, 强度特性

Abstract: Low-strength, highly compressible soft clays are widely distributed in coastal areas of south China, where their engineering characterization is critical for infrastructure development. Although cone penetration test (CPT) efficiently acquires geotechnical parameters, data interpretation exhibits regional variability, and the applicability of existing methods requires urgent validation. Focusing on coastal clay sites in Dongguan, Guangdong, and surrounding regions, this study integrates in-situ CPT testing, consolidated undrained triaxial tests, and consolidated quick shear tests to analyze the mechanical behavior of coastal clays. Based on CPT data from Dongguan’s coastal soft clays, the modified soil behavior index (IB) is demonstrated to quantitatively characterize soft clays and enhance soil classification. A preliminary assessment of stress history is conducted using normalized cone tip resistance and the modified soil classification index, with a combined application of Mayne and Robertson’s methods recommended for determining the over-consolidation ratio (OCR) of soft clay layers. Comparative analysis of consolidated undrained triaxial tests and consolidated quick shear tests reveals that CPT-derived mechanical indices necessitate calibration against laboratory data. State parameters interpreted from CPT align with Robertson’s soil classification chart. Five methodologies are employed to evaluate the compressibility modulus, showing that CPT-derived results fall within code-recommended ranges, with the K-M1990 method shows high accuracy in coastal silt soil layers. The research outcomes provide regionally optimized solutions for CPT data interpretation in south coastal soft clays, offering practical guidance for geotechnical investigations. This work bridges the gap between conventional CPT interpretation frameworks and region-specific geotechnical conditions, advancing reliability in coastal engineering applications.

Key words: coastal clays, cone penetration test, over-consolidation ratio, strength characteristics

中图分类号: TU447
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