高聚物注浆材料压缩疲劳损伤演化与寿命预测  

Compression Fatigue Damage Evolution and Life Prediction of Polymer Grouting Materials

作　　者：张超[1,2,3] 潘旺 方宏远 王翠霞[1,2,3] 王复明 ZHANG Chao;PAN Wang;FANG Hong-yuan;WANG Cui-xia;WANG Fu-ming(School of Water Conservancy and Transportation/Yellow River Laboratory/Underground Engineering Research Institute,Zhengzhou University,Zhengzhou 450001,Henan,China;Collaborative Innovation Center for Disaster Prevention and Control of Underground Engineering Jointly Built by Provinces and Ministries,Zhengzhou 450001,Henan,China;National Local Joint Engineering Laboratory of Major Infrastructure Testing and Rehabilitation Technology,Zhengzhou 450001,Henan,China)

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

出　　处：《中国公路学报》2023年第10期64-74,共11页China Journal of Highway and Transport

基　　金：国家自然科学基金项目(51978630,52178368,51909242,52009125);河南省高校科技创新团队和人才培养计划项目(23IRTSTHN004,23HASTIT007);中国博士后基金项目(2020TQ0285,2022M722882);黄河实验室(郑州大学)一流课题(YRL22LT07);河南省博士后科研项目启动资助(202001016);河南省高等学校重点科研项目(21A570007)。

摘　　要：高聚物注浆材料以固化时间短、膨胀力和膨胀比大、轻质高强等特点在道路的非开挖修复中应用广泛。在长期交通荷载作用下高聚物注浆材料的力学性能会受到一定程度的影响,然而其疲劳损伤演化规律和服役寿命预测尚未见到系统研究。采用现场试验、准静态压缩和循环压缩试验对高聚物注浆材料的修复效果和静动态抗压性能进行了研究,提出了一种基于密度和寿命的疲劳阈值预测公式。结果表明:弹性模量、抗压强度、准静态能量耗散随密度增大而增大且存在幂函数关系;不同密度高聚物注浆材料的疲劳阈值在0.6~0.8之间;压缩疲劳性能随着相对循环次数的演化过程可分为3阶段(调整阶段、稳定变化阶段、循环破坏或循环硬化阶段);在较高应力水平(0.7和0.8)下,经过调整和稳定变化阶段,动态弹性模量减小,累积应变、应变速率、动态能量耗散增大;相对循环次数达到80%之后,疲劳性能参数急剧变化,动态弹性模量平均减小了93.69 MPa,累积应变、应变速率、动态能量耗散平均增加了0.15、0.20 s^(-1)、0.027 MJ·m^(-3);试件发生破坏且在泡孔结构中出现裂纹和坍塌破碎;在低应力水平(0.6)下,经过调整阶段,动态弹性模量和累积应变与循环次数存在对数函数关系,应变速率和动态能量耗散与循环次数存在指数函数关系;循环硬化后,其宏微观形貌无明显损伤,且抗压强度和弹性模量平均有超过20%的提高。所得结果为高聚物注浆材料耐久性能评价和推广应用提供了一定的理论指导和科学依据。Polymer grouting materials are widely used in non-excavation highway rehabilitation owing to their short curing times,large expansion forces and expansion ratios,light weight,high strength,etc.The mechanical properties of polymer grouting materials are affected by long-term traffic loading to a certain extent.However,no systematic study has been conducted to identify the fatigue damage evolution law(s)or to predict service lives.In this study,the rehabilitation effects and static-dynamic compressive performances of polymer grouting materials were analyzed using field tests,quasi-static compression tests,and cyclic compression tests.In addition,a fatigue threshold prediction formula was proposed based on the density and service life.The results show that the elastic modulus,compressive strength,and quasi-static energy dissipation increase with increasing density and that power function relationships exist between them.The fatigue thresholds of polymer grouting materials with different densities are in the range of 0.6-0.8.The evolution of the compressive fatigue properties with the relative number of cycles can be divided into three stages:the adjustment stage,stable change stage,and cyclic failure or cyclic-hardening stage.At higher stress levels(0.7 and 0.8),the dynamic elastic modulus decreases and the accumulated strain,strain rate,and dynamic energy dissipation increase after the adjustment and stable-change stages.The fatigue performance parameters change dramatically after the relative number of cycles reaches 80%,with the dynamic elastic modulus decreasing by an average of 93.69 MPa and the accumulated strain,strain rate,and dynamic energy dissipation increasing by averages of 0.15,0.20 s^(-1),and 0.027 MJ·m^(-3),respectively.The specimens are destroyed and cracks and collapses occur in the cell structures.At low stress levels(0.6),the dynamic elastic modulus and accumulated strain are related to the number of cycles as a logarithmic function;after the adjustment stage,the strain rate and dynamic energy d

关 键 词：路基工程 高聚物注浆材料 压缩疲劳 疲劳损伤 寿命预测 注浆修复 

分 类 号：U416.03[交通运输工程—道路与铁道工程]