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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 (9): 1780-1788    DOI: 10.3785/j.issn.1008-973X.2022.09.011
土木工程、交通工程     
基于改进内聚力模型的沥青超薄罩面层间失效行为分析
肖敏敏(),钱思博
上海应用技术大学 城市建设与安全工程学院，上海 201418
Interlayer failure behavior analysis of ultra-thin asphalt overlay based on improved cohesive model
Min-min XIAO(),Si-bo QIAN
School of Urban Construction and Safety Engineering, Shanghai Institute of Technology, Shanghai 201418, China
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摘要：

为了准确预测沥青超薄罩面层间失效行为，在考虑层间黏结应力与摩擦效果耦合作用的基础上，引入改进内聚力模型表征界面接触特性，基于沥青超薄罩面直剪试验进行数值模拟，描述沥青超薄罩面层间失效行为演化特征，通过直剪试验验证改进内聚力模型的可靠性. 研究结果表明：层间黏结应力和层间摩擦系数由摩尔?库伦理论拟合直剪试验结果得到；沥青超薄罩面界面的切应力与剪切位移的关系分为切应力应变弹性强化、切应力应变软化及残余应力应变阶段；选择临界断裂能作为评价沥青超薄罩面层间失效行为的指标，该指标的数值随正向应力的增大而增加；数值模拟结果与试验结果一致度较高，验证了使用改进内聚力模型进行沥青超薄罩面层间剪切破坏行为研究的可行性.
关键词： 道路工程;  沥青超薄罩面;  改进内聚力模型;  层间失效;  临界断裂能    
Abstract:

In order to accurately predict the interlaminar failure behavior of asphalt ultra-thin overlay, on the basis of considering the coupling effect of interlayer bonding stress and friction effect, an improved cohesion model was introduced to characterize the interface contact characteristics. Based on the direct shear test of asphalt ultra-thin overlay, numerical simulation was carried out to describe the evolution characteristics of interlaminar failure behavior of asphalt ultra-thin overlay. The reliability of the improved cohesive model was verified by direct shear test. Results show that the results of direct shear test are fitted by Moore-Coulomb theory, and the bond stress and friction coefficient between layers can be obtained respectively. The relationship between shear stress and shear displacement of asphalt ultra-thin overlay interface can be divided into shear stress-strain elastic strengthening stage, shear stress-strain softening stage and residual stress-strain stage. Critical fracture energy can be used as an index to evaluate the failure behavior of ultra-thin asphalt overlay, which increases with the increase of normal stress. The numerical simulation results are in good agreement with the experimental results, which verifies the feasibility of studying the interlayer shear failure behavior of asphalt ultra-thin cover used by the improved cohesive model.
Key words: road engineering    ultra-thin asphalt overlay    improved cohesive model    failure of interlayer    critical fracture energy
收稿日期: 2021-08-26 出版日期: 2022-09-28
CLC:  U 41  
基金资助: 上海应用技术大学中青年教师科技人才发展基金资助项目（ZQ2019-10）；上海市大学生创新创业训练项目（DCX20210269）
作者简介: 肖敏敏（1983—），女，副教授，从事道路结构与材料研究. orcid.org/0000-0002-0935-1371. E-mail： xiaominmin329@163.com
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引用本文:

肖敏敏,钱思博. 基于改进内聚力模型的沥青超薄罩面层间失效行为分析[J]. 浙江大学学报(工学版), 2022, 56(9): 1780-1788.

Min-min XIAO,Si-bo QIAN. Interlayer failure behavior analysis of ultra-thin asphalt overlay based on improved cohesive model. Journal of ZheJiang University (Engineering Science), 2022, 56(9): 1780-1788.

链接本文:

https://www.zjujournals.com/eng/CN/10.3785/j.issn.1008-973X.2022.09.011    或    https://www.zjujournals.com/eng/CN/Y2022/V56/I9/1780

图 1  沥青超薄罩面直剪试验试件尺寸及加载示意图
Mpa
$ \sigma $ $ {\tau _{{\text{max}}}} $ $ \sigma $ $ {\tau _{{\text{max}}}} $
0 0.089 1 0.6 0.275 4
0.2 0.176 2 0.8 0.355 6
0.4 0.245 3 1.0 0.485 2
表 1  不同法向应力作用下沥青超薄罩面试件抗剪强度
图 2  不同法向应力下直剪试验结果
图 3  转换参数对破坏形态参数的影响
参数 数值 参数 数值
$ {E_{\text{n}}} $/(N·mm?1) 0.116 $ \beta $ 3
$ {E_{\text{t}}} $/(N·mm?1) 0.116 $ {\lambda _{\text{n}}} $ 0.3
$ {\sigma _{{\text{max}}}} $/MPa 0.089 1 $ {\lambda _{\text{t}}} $ 0.3
$ {\tau _{{\text{max}}}} $/MPa 0.089 1 $ s $ 1.8
$ \alpha $ 3 $ {\mu _{\text{f}}} $ 0.364 1
表 2  改进内聚力模型下层间材料力学参数
图 4  直剪试验的数值模拟结果与试验结果对比
图 5  不同正向荷载下改进内聚力模型计算所得的剪切应力−位移曲线
图 6  不同正向荷载下直剪试验的数值模拟结果与试验结果对比
图 7  不同正向荷载下改进内聚力模型计算所得的切应力与剪切位移拟合关系
$ \sigma $/MPa $ x $/mm $ {E_{\text{t}}} $/J R2
0 3.356 11.6 0.999 7
0.2 3.348 32.9 0.999 5
0.4 3.361 43.9 0.999 8
0.6 3.346 46.3 0.998 0
0.8 3.342 63.7 0.998 6
1 3.337 81.6 0.998 4
表 3  沥青超薄罩面层间剪切破坏时临界断裂能
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