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浙江大学学报(工学版)
浙江大学学报(工学版)  2022, Vol. 56 Issue (7): 1328-1335, 1352    DOI: 10.3785/j.issn.1008-973X.2022.07.008
土木工程、水利工程、交通工程     
基于次加载面摩擦模型的接触面剪切特性研究
龚涛1(),刘开富2,谢新宇1,3,*(),许纯泰1,娄扬1,郑凌逶4
1. 浙江大学 滨海和城市岩土工程研究中心，浙江 杭州 310058
2. 浙江理工大学 建筑工程学院，浙江 杭州 310018
3. 浙江大学 温州研究院，浙江 温州 325035
4. 浙大宁波理工学院 土木建筑工程学院，浙江 宁波 315100
Shear characteristics of interface based on subloading-friction model
Tao GONG1(),Kai-fu LIU2,Xin-yu XIE1,3,*(),Chun-tai XU1,Yang LOU1,Ling-wei ZHENG4
1. Research Center of Coastal and Urban Geotechnical Engineering, Zhejiang University, Hangzhou 310058, China
2. School of Civil Engineering and Architecture, Zhejiang Sci-Tech University, Hangzhou 310018, China
3. Institute of Wenzhou, Zhejiang University, Wenzhou 325035, China
4. School of Civil Engineering and Architecture, Ningbo Tech University, Ningbo 315100, China
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摘要：

为了反映土与结构接触面的应变软化特性以及剪切速率对土与结构接触面力学特性的影响，基于ABAQUS软件提供的FRIC子程序，采用显式积分算法，对能够表现接触面上应变软化的次加载面摩擦模型进行二次开发. 利用该模型模拟土与结构接触面的直剪试验，研究直剪试验过程中次加载面摩擦模型接触面上的应力演变过程. 研究结果表明，利用次加载面摩擦本构模型，能够较好地模拟土-结构接触面直剪试验中的应变软化和密实状态的类砂土残余切应力随剪切速率的增大而下降的现象. 在剪切位移的发展过程中，次加载面摩擦模型接触面上的切应力先增加后减小，接触面远离加载端一侧到另一侧的应力发挥水平先后达到最大值. 该研究表明，次加载面摩擦模型可以用于土与结构接触面的应变软化特性和速率相关性的模拟.
关键词： 土-结构接触面;  直剪试验;  应变软化;  次加载面摩擦模型    
Abstract:

A secondary development of the subloading-friction model that can describe the strain softening phenomenon of contact surface was realized based on subroutine FRIC provided by ABAQUS by using explicit integration algorithm in order to reflect the strain softening characteristics of soil-structure surface and the effect of shear rate on the mechanical properties of soil-structure interface. The developed model was used to simulate the direct shear tests of soil-structure interface, and the evolution process of the stress on the contact surface during direct shear test was analyzed. The numerical calculation results indicate that the subloading-friction model can simulate the strain softening phenomenon of soil-structure interface well, and simulate the decrease of residual shear stress of dense quasi-sands with the increase of shear rate in the direct shear test. The shear stress on the contact surface of subloading-friction model increases at first and then decreases with the development of shear displacement, and the stress exertion level of the contact surface reaches the maximum successively from one side away from the loaded end to the other side. Results show that the subloading-friction model can be used to simulate the strain softening characteristics and rate dependence of the mechanical properties of soil-structure interface.
Key words: soil-structure interface    direct shear test    strain softening    subloading-friction model
收稿日期: 2021-07-07 出版日期: 2022-07-26
CLC:  TU 43  
基金资助: 国家自然科学基金资助项目（51878619, 52078465）
通讯作者: 谢新宇     E-mail: 11812029@zju.edu.cn;xiexinyu@zju.edu.cn
作者简介: 龚涛（1996—），男，博士生，从事桩土相互作用的研究. orcid.org/0000-0002-7461-7471. E-mail： 11812029@zju.edu.cn
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龚涛
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引用本文:

龚涛,刘开富,谢新宇,许纯泰,娄扬,郑凌逶. 基于次加载面摩擦模型的接触面剪切特性研究[J]. 浙江大学学报(工学版), 2022, 56(7): 1328-1335, 1352.

Tao GONG,Kai-fu LIU,Xin-yu XIE,Chun-tai XU,Yang LOU,Ling-wei ZHENG. Shear characteristics of interface based on subloading-friction model. Journal of ZheJiang University (Engineering Science), 2022, 56(7): 1328-1335, 1352.

链接本文:

https://www.zjujournals.com/eng/CN/10.3785/j.issn.1008-973X.2022.07.008    或    https://www.zjujournals.com/eng/CN/Y2022/V56/I7/1328

图 1  FRIC子程序计算流程图
参数 数值 参数 数值
$\;{\mu _{\rm{s}}}$ 1.05 $\kappa /{{\text{m}}^{ - 1}}$ 215
$\;{\mu _{\rm{k}}}$ 0.57 $\xi /{{\text{s}}^{ - 1}}$ 0.00004
$ {\alpha _{\rm{t}}}/\left( {{{\text{kN}}} \cdot{{{\text{m}}^{-3}}}}\right) $ 2×106 $\tilde u/{{\text{m}}^{ - 1}}$ 8500
${\alpha _{\rm{n} } }/\left( { {\text{kN} }\cdot{ {\text{m} }^{-3} } } \right)$ 2×106 ? ?
表 1  算例1的模型参数
图 2  接触面直剪试验的三维模型
图 3  切应力-剪切位移关系的模拟曲线与试验结果比较
图 4  接触面直剪试验的三维模型
参数 数值 参数 数值
$\;{\mu _{\rm{s}}}$ 0.74 $\kappa /{{\text{m}}^{ - 1}}$ 1500
$\;{\mu _{\rm{k}}}$ 0.48 $\xi /{{\text{s}}^{ - 1}}$ 0.005
$ {\alpha _{\rm{t}}}/\left( {{{\text{kN}}} \cdot{{{\text{m}}^{-3}}}}\right) $ 105 $\tilde u/{{\text{m}}^{ - 1}}$ 15000
${\alpha _{\rm{n}}}/\left( {{\text{kN}}\cdot{{\text{m}}^{-3}}} \right)$ 2×106 ? ?
表 2  算例2的模型参数
图 5  不同剪切速率下切应力-剪切位移关系的模拟曲线与试验结果比较
图 6  剪切位移达到10 mm时接触面上的应力分布
图 7  接触面应力随剪切位移的发展变化曲线
图 8  不同剪切位移下接触面正常滑动屈服比的分布图
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