基于界面物态演变规律的衬垫界面动力模型

冯世进; 沈阳; 郑奇腾; 常纪昀; 史嘉梁

doi:10.11779/CJGE201911006

基于界面物态演变规律的衬垫界面动力模型 English Version

冯世进^1,2,
沈阳^1,2,
郑奇腾^1,2,
常纪昀^1,2,
史嘉梁^1,2

1. 岩土及地下工程教育部重点实验室,上海 200092;
2. 同济大学地下建筑与工程系,上海 200092

基金项目: 国家自然科学基金杰出青年基金项目（41725012）; 国家自然科学基金面上项目（41572265）

详细信息

作者简介:
冯世进(1978— ),男,博士,教授,博士生导师,主要从事环境岩土工程、土动力学的教学与科研工作。E-mail: fsjgly@tongji.edu.cn。

中图分类号: TU43
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出版历程
- 收稿日期: 2019-01-12
- 发布日期: 2019-11-24

Dynamic interface model based on physical state evolution of liner interface

1. Key Laboratory of Geotechnical and Underground Engineering, Ministry of Education, Shanghai 200092, China;
2. Department of Geotechnical Engineering, Tongji University, Shanghai 200092, China

摘要

摘要: 衬垫界面的动力剪切特性对填埋场动力稳定性有着重要影响,然而,已有界面/接触面动力本构理论无法完整揭示其动力剪切过程中的物态演变机理。将土工膜/GCL界面的动力剪切过程分为土质材料变形和界面滑动摩擦两个物态阶段,提出了触发界面物态演变的界面临界状态和临界应力,结合界面动力剪切基本规律,分别采用弹塑性模型与摩擦系数模型描述两个物态阶段,建立了衬垫界面动力模型,并与多次循环条件下的土工膜/GCL界面动力剪切试验进行对比,验证了该动力模型的准确性。研究表明,该模型能有效地模拟衬垫界面动力剪切变形的力学特性与物态演变规律,为填埋场动力稳定性分析提供了理论支持。
- 填埋场衬垫 /
- 土工膜/GCL界面 /
- 界面动力模型 /
- 物态演变
Abstract: The dynamic shear characteristics of the liner interface have significant impacts on the seismic stability of landfills. However, the existing interface dynamic constitutive theory cannot fully reveal the evolution mechanism of the physical state during the dynamic shear process of a liner interface. The dynamic shear process of geomembrane/GCL interface is divided into two stages: deformation of soil materials and sliding friction of interface. The concepts of critical state and critical stress of interface, triggering interfacial physical state evolution, are proposed. Considering the basic laws of interfacial dynamic shearing, the elastic-visco model and friction coefficient model are utilized to describe the two stages. The accuracy of the interfacial dynamic model is verified by geomembrane/GCL interface dynamic shear tests under multiple cycling conditions. The research exhibits that the proposed model can effectively simulate the mechanical properties and physical state evolution of the dynamic shear deformation of a liner interface, providing a theoretical support for a seismic stability analysis of landfills.
- landfill liner /
- geomembrane/GCL interface /
- dynamic interface model /
- physical state evolution

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参考文献(13)

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