北京航空航天大学学报 ›› 2016, Vol. 42 ›› Issue (1): 13-20.doi: 10.13700/j.bh.1001-5965.2015.0069

• 论文 • 上一篇    下一篇

考虑膨胀效应的UH模型及其有限元实现

罗汀1, 张盼盼1, 姚仰平1, 刘月妙2, 陈亮2, 曹胜飞2   

  1. 1. 北京航空航天大学交通科学与工程学院, 北京 100083;
    2. 核工业北京地质研究院环境工程研究所, 北京 100029
  • 收稿日期:2015-01-31 出版日期:2016-01-20 发布日期:2016-01-28
  • 通讯作者: 罗汀,Tel.:13671128963E-mail:tluo@buaa.edu.cn E-mail:tluo@buaa.edu.cn
  • 作者简介:罗汀女,博士,教授,博士生导师。主要研究方向:土的基本特性和本构模型研究。Tel.:13671128963E-mail:tluo@buaa.edu.cn
  • 基金资助:
    国家"973"计划(2014CB047001);国家自然科学基金(51179003,11272031,51579005)

UH model considering expansion of soils and its finite element implementation

LUO Ting1, ZHANG Panpan1, YAO Yangping1, LIU Yuemiao2, CHEN Liang2, CAO Shengfei2   

  1. 1. School of Transportation Science and Engineering, Beijing University of Aeronautics and Astronautics, Beijing 100083, China;
    2. Division of Environment Engineering, Beijing Research Institute of Uranium Geology, Beijing 100029, China
  • Received:2015-01-31 Online:2016-01-20 Published:2016-01-28
  • Supported by:
    National Basic Research Program of China (2014CB047001); National Natural Science Foundation of China (51179003,11272031,51579005)

摘要: 超固结非饱和土统一硬化(UH)模型在分析超固结非饱和土问题中有广泛的适用性,其不仅可以使超固结状态下的湿化模拟更为合理,也能够反映超固结非饱和土的硬化、软化等特性。在超固结非饱和土本构模型的基础上,考虑土体团粒的吸水膨胀作用,提出了考虑膨胀效应的UH模型。该模型只比超固结非饱和土UH模型增加了一个参数,不仅能够描述普通加载路径下超固结膨润土的应力应变特性,还能反映其在湿化路径下的膨胀效应。基于有限元软件的二次开发平台,进行了考虑膨润土膨胀效应UH模型的有限元实现,并通过对三轴试验和膨胀力试验的数值模拟,验证了模型子程序的合理性。

关键词: 高庙子(GMZ)膨润土, 吸力, 超固结, 膨胀效应, 有限元

Abstract: The unified hardening model (UH model) for overconsolidated unsaturated soils is applicable to problems involving unsaturated soils. The wetting behaviors of unsaturated soils in overconsolidated condition can be described more reasonably using this model. It can also describe strain-hardening and softening behaviors of the unsaturated soils better. Based on the UH model for unsaturated soils, a new UH model for bentonite was proposed by considering the expansion of the soil aggregates. With just one more parameter, the proposed model can not only describe the stress-strain behaviors of the bentonite under general loading paths,but also describe the expansion of the bentonite under wetting paths. Based on the secondary development platform of finite element software, the UH model considering the expansion of the bentonite has been implemented. The subroutine was proved to be reasonable through the simulation of the triaxial test and the swelling pressure test using the proposed model.

Key words: Gaomiaozi (GMZ) bentonite, suction, overconsolidation, inflation, finite element

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