长江科学院院报 ›› 2021, Vol. 38 ›› Issue (1): 129-136.DOI: 10.11988/ckyyb.20191134

• 岩土工程 • 上一篇    下一篇

基于耗散能的海洋K0固结土统一修正剑桥模型

吴有平1,2, 伏亮明1, 周轩漾1, 胡达3, 黄礼胜4   

  1. 1.中国电建集团中南勘测设计研究院有限公司 研发中心,长沙 410014;
    2.武汉大学 土木建筑工程学院,武汉430072;
    3.湖南城市学院 土木工程学院,湖南 益阳 413000;
    4.广东省有色金属地质局,广州 510080
  • 收稿日期:2019-09-17 修回日期:2020-02-10 出版日期:2021-01-01 发布日期:2021-01-27
  • 作者简介:吴有平(1979-),男,湖南邵阳人,工程师,博士,研究方向为海洋岩土工程。E-mail:wwuyn@163.com
  • 基金资助:
    湖南省自然科学基金项目(2019JJ50030);湖南省教育厅科学研究项目(18C0850)

Unified Modified Cam-Clay Model for Marine K0 Consolidated Soil Based on Dissipative Energy

WU You-ping1,2, FU Liang-ming1, ZHOU Xuan-yang1, HU Da3, HUANG Li-sheng4   

  1. 1. Department of Research and Development,Power China Zhongnan Engineering Co., Ltd., Changsha410014, China;
    2. School of Civil Engineering,Wuhan University, Wuhan 430072, China;
    3. College ofCivil Engineering, Hunan City University, Yiyang 413000, China;
    4. Geology Bureau for NonferrousMetals of Guangdong Province, Guangzhou 510080, China
  • Received:2019-09-17 Revised:2020-02-10 Online:2021-01-01 Published:2021-01-27

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摘要： 在海上风电桩基工程计算时,为方便土体本构关系的使用,减少土工参数的选取,对修正剑桥模型进行了改进。首先根据海洋工程中桩周土体通常为K0固结饱和土的特点,在修正剑桥模型的基础上,引入相变参数,推导出适用于剪胀性土体的屈服面函数;然后参考统一硬化模型的研究理念,引入耗散功作为硬化参量,结合传统弹塑性理论,对Collins的热力学土体模型进行改进,提出了一种同时适用于砂土与黏土的新的统一修正剑桥模型;最后采用2个案例进行验证。研究结果表明:提出的本构模型具有计算精度高、选用计算参数少且物理意义明确的特点,可为海洋工程基础的相关计算提供参考。

关键词: 海洋土体, K0固结, 耗散功, 硬化参量, 统一修正剑桥模型

Abstract: The modified Cam-Clay model is improved to facilitate the use of soil constitutive model and reduce the selection of geotechnical parameters in the calculation of offshore wind power pile foundation. Firstly, according to the characteristics of K0 consolidated saturated soil in ocean engineering, the yield surface function suitable for dilatant soil is derived by introducing phase change parameters based on the modified Cam-Clay model. Furthermore, referring to the research concept of the unified hardening model, the dissipative work is introduced as hardening parameter to improve the thermodynamic soil model of Collins in association with the traditional elastic-plastic theory. A new unified modified Cam-Clay model suitable for both sand and clay is proposed. Finally, case analysis is carried out to verify the model. Results demonstrate that the constitutive model proposed in this paper needs few calculation parameters, and is of high accuracy and clear physical meaning.

Key words: marine soil, K0 consolidation, dissipated work, hardening parameters, unified modified Cam-Clay model

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