新型聚氨酯弹性体注浆材料的压缩尺寸效应及应变率效应  

Compression Size Effect and Strain Rate Effect of a New Polyurethane Elastomer Grouting Material

作　　者：潘旺 夏洋洋 张超[1,2,3] 方宏远 王复明[1,2,3] PAN Wang;XIA Yangyang;ZHANG Chao;FANG Hongyuan;WANG Fuming(School of Water Conservancy and Transportation,Zhengzhou University,Zhengzhou 450001,China;National Local Joint Engineering Laboratory of Major Infrastructure Testing and Rehabilitation Technology,Zhengzhou 450001,China;Collaborative Innovation Center for Disaster Prevention and Control of Underground Engineering Jointly Built by Provinces and Ministries,Zhengzhou 450001,China)

机构地区：[1]郑州大学水利与交通学院,郑州450001 [2]重大基础设施检测修复技术国家地方联合工程实验室,郑州450001 [3]地下工程灾变防控省部共建协同创新中心,郑州450001

出　　处：《材料导报》2023年第15期269-275,共7页Materials Reports

基　　金：国家自然科学基金(51978630,52178368,51909242);中国博士后基金(2021T140619,2021M692939);河南省科技攻关(212102310280);河南省博士后科研项目启动资助(202001016)。

摘　　要：为了解决现有风电基础注浆加固材料强度低、抗变形能力弱及可注性差等难题,制备了一种新型聚氨酯弹性体注浆材料。在考虑尺寸效应和应变率效应的影响下进行了单轴压缩试验研究,得到了压缩应力-应变关系曲线,提出了一种适用于该聚氨酯弹性体注浆材料的四参数唯象本构模型。结果表明:在该材料达到极限破坏之前,其应力-应变关系分为弹性阶段、屈服阶段、应变软化阶段三个阶段;材料的弹性模量、抗压强度、软化应力、能量密度等力学参数随应变率增大而增大,随试件尺寸的增大呈现先减小后增大的趋势,且相比尺寸效应,应变率效应的影响更为显著。本工作提出的四参数唯象本构模型能准确地表征本材料在不同尺寸时的压缩应力-应变关系。此本构模型为该聚氨酯弹性体注浆材料的理论计算和工程应用提供了重要的科学依据。In order to solve the problems of low strength,weak anti-deformation ability and poor injectivity of existing grouting reinforcement materials for wind power foundation,a new polyurethane elastomer grouting material was prepared.Considering the size effect and strain rate effect,the uniaxial compression test was carried out,the compressive stress-strain relationship curve was obtained,and a four-parameter phenomenological constitutive model suitable for the polyurethane elastomer grouting material was proposed.The results show that the stress-strain relationship can be divided into three stages:elastic stage,yield stage and strain-softening stage before the material reaches the ultimate failure stage.The elastic modulus,compressive strength,softening stress,energy density and other mechanical parameters of the material increase with the increase of strain rate,and decrease first and then increase with the increase of specimen size,and the strain rate effect is more significant than the size effect.In addition,the four-parameter phenomenological constitutive model proposed in this work can accurately characterize the stress-strain relationship of the material.The constitutive model provides an important scientific basis for theoretical calculation and engineering application of the polyurethane elastomer grouting material.

关 键 词：聚氨酯弹性体注浆材料 压缩性能 应变率 尺寸效应 本构模型 

分 类 号：TU502.6[建筑科学—建筑技术科学]