超高性能混凝土-花岗岩石材界面的抗剪性能研究  

Experimental Study on Interface Shear Behavior Between Ultra-high Performance Concrete and Granite Stone

作　　者：王耀 郑新颜 黄伟 吴应雄[2] 黄雅莹 张恒春 张峰 WANG Yao;ZHENG Xinyan;HUANG Wei;WU Yingxiong;HUANG Yaying;ZHANG Hengchun;ZHANG Feng(CSCEC Strait Construction and Development Co.,Ltd.,Fuzhou 350015,China;College of Civil Engineering,Fuzhou University,Fuzhou 350108,China;College of Civil Engineering,Hunan University,Changsha 410082,China)

机构地区：[1]中建海峡建设发展有限公司,福州350015 [2]福州大学土木工程学院,福州350108 [3]湖南大学土木工程学院,长沙410082

出　　处：《材料导报》2025年第6期126-135,共10页Materials Reports

基　　金：国家自然科学基金(52378495);福建省中科院STS计划配套项目(2022T3032);中建七局重点课题(CSCEC7b-2024-Z-1);福建省住建厅科技开发研究项目(2022-K-229,2022-K-294,2025-K-31)。

摘　　要：在超高性能混凝土(Ultra-high performance concrete,UHPC)加固修复既有石结构中,UHPC与石材之间良好的粘结性能是保证加固效果的关键。因此,为探究UHPC-石材的界面抗剪性能,通过五组UHPC-石材剪切试验,以石材表面粗糙度(光滑、凿毛、不同键槽深度)为变量,研究了UH-PC-石材试件破坏模式、荷载-滑移曲线、界面抗剪强度、基体应变等特征。将试验结果与数值模拟结果进行了对比,并提出界面抗剪承载力公式。结果表明:界面键槽处理方式能显著提高UHPC-石材试件界面粘结抗剪强度、改变破坏形态并有效提升试件的延性,当键槽深度为20 mm时,试件表现出较好的界面粘结性能。另外,UHPC与石材基体在弹性变形阶段的应变发展相似,表明两者材料在该阶段具有较好的协调变形能力。通过数值模拟及界面承载力计算公式与试验结果的验证表明,数值模拟的荷载-滑移曲线、界面粘结强度、应力分布等与试验结果表现出良好的一致性;此外,不同键槽形状的参数分析结果表明,当键槽深度为10 mm、20 mm时,正梯形键槽提高了界面抗剪承载力;与现有的界面抗剪承载力公式对比,提出的UHPC-石材界面承载力计算公式能够有效地预测界面抗剪承载力。The excellent bonding property between UHPC(ultra-high performance concrete)and stone is the key to ensuring the reinforcement effect of existing stone structure buildings by UHPC.Therefore,in order to explore the interface shearing behavior between UHPC and stone,five groups of specimens with smooth surface,chisel treatment and different groove depths were investigated by push-off tests.Then,the failure model,load-slip curve,interfacial shear strength,and matrix strain of UHPC-stone specimens were studied.Based on the experimental results,the numerical simulation was carried out and the formula of shearing capacity was proposed.The results show that the interface grooves treatment could significantly improve the interface shear strength,change the failure model and effectively improve the ductility of specimens.The specimen shows better interface bonding strength and ductility when the groove depth is 20 mm.In addition,the strain development of UHPC matrix is similar to that of stone at the elastic deformation stage,which indicates that the both materials have better coordinated deformation ability at this stage.Through the verification of numerical simulation and calculation formula of interface bearing capacity,the load-slip curve,interfacial bon-ding strength and stress distribution from numerical simulation are in good agreement with these from experiment.In addition,the results of pa-rameter analysis of different groove shapes show that the positive trapezoid treatment can improves the interface shear performance at groove depth of 10 mm and 20 mm.Compared with the existing formulas of shearing bearing capacity,the proposed formula can effectively predict the interface shear capacity of UHPC-stone.

关 键 词：超高性能混凝土 石材 界面处理 界面抗剪性能 数值模拟 

分 类 号：TU528[建筑科学—建筑技术科学]