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工程科学与技术:2021,53(4):168-177
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考虑粗糙度影响的黏土-混凝土接触面峰值剪切强度模型研究
(1.佛山市交通科技有限公司,广东 佛山 528000;2.中南大学 土木工程学院,湖南 长沙 410075)
Peak Shear Strength Model for Clay-concrete Interface Considering Roughness
(1.Foshan Transportation Sci. and Technol. Co., Ltd., Foshan 528000, China;2.College of Civil Eng., Central South Univ., Changsha 410075, China)
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投稿时间:2020-07-11    修订日期:2020-09-10
中文摘要: 结构物表面粗糙度是影响土体与结构接触面剪切力学特性的重要因素。为研究结构面粗糙度对接触面强度特性的影响,采用大型直剪仪进行不同粗糙条件下黏土-混凝土接触面剪切试验,分析粗糙度对接触面峰值剪切强度的影响规律,并揭示粗糙度对接触面剪切强度的影响机理。研究结果表明:不同粗糙度条件下黏土-混凝土接触面剪切应力位移曲线均表现为剪切软化型,且粗糙度越大,曲线的峰值点越明显。粗糙度的增大能显著提高接触面的峰值剪切强度,且粗糙度的影响存在临界值;不同粗糙接触面的剪切破坏面形态特征分析结果表明,剪切过程中光滑接触面主要发生界面剪切滑移破坏,随着粗糙度的增大,土体与结构面间的摩擦、咬合作用得到增强,导致接触面剪切破坏逐渐向土体内部剪切破坏发展。接触面的剪切强度主要由土体与光滑接触部分的界面剪切强度以及粗糙接触部分土体自身剪切强度组成,通过在Jewell界面强度模型中引入与粗糙度相关的粗糙效应系数,并提出了粗糙效应系数与粗糙度间的函数关系式,最终建立了考虑粗糙度的接触面峰值剪切强度模型;最后将不同粗糙度条件下的模型计算值与试验值进行对比分析,模型计算最大相对误差为11.01%,平均相对误差为4.74%,验证了本文模型的准确性与合理性。
Abstract:Surface roughness of structures is a primary factor that affects the mechanical properties of soil-structure interface. To further study the effect of roughness on shear strength of interface, large-scale direct shear tests were performed on clay-concrete interface under different roughness conditions and the influence mechanism of roughness on peak shear strength of interface was revealed. The results showed that the shear stress-displacement curves of clay-concrete interface exhibited strain-softening under different roughness conditions, and the greater roughness, the more obvious peak point of curve. Increasing roughness could obviously increase the peak shear strength of interface and there existed a critical roughness in terms of its influence on peak shear strength of interface. Morphological characteristics of the shear failure plane of different rough interfaces indicated that the smooth interface mainly occurred shear slip failure during the shearing process, and the friction and occlusion between clay particles and concrete were strengthened with increasing roughness, which resulted in the internal shear failure of clay. The shear strength of interface can be approximately divided into two parts: the shear strength of smooth interface and the shear strength of soil in rough parts. A new peak shear strength model of interface considering roughness was established by introducing a roughness-related coefficient into Jewell’s model and proposing a function to describe the relationship between the coefficient and roughness. Finally, comparison results between calculated value and test value showed that maximum relative error was 11.01% and mean relative error was 4.74%, which verified the accuracy and rationality of the proposed model.
文章编号:202000574     中图分类号:TU443    文献标志码:
基金项目:国家自然科学基金项目(51978674);湖南省自然科学基金项目(2017JJ2314);佛山市科技计划项目(2020001005435)
作者简介:第一作者:成浩(1990-),男,博士.研究方向:交通岩土工程.E-mail:cheng900918@163.com
引用文本:
成浩,曾国东,周敏,王晅,张家生,王佳.考虑粗糙度影响的黏土-混凝土接触面峰值剪切强度模型研究[J].工程科学与技术,2021,53(4):168-177.
CHENG Hao,ZENG Guodong,ZHOU Min,WANG Xuan,ZHANG Jiasheng,WANG Jia.Peak Shear Strength Model for Clay-concrete Interface Considering Roughness[J].Advanced Engineering Sciences,2021,53(4):168-177.