聚氨酯类聚合物砂浆-混凝土界面黏结性能与变形特征试验研究  

Experimental study on bonding properties and deformation characteristics of polyurethane polymer mortar-concrete interface

作　　者：蒋中明[1,2] 石兆丰 杨雪 田湘 肖喆臻 刘琛智 黄湘宜 JIANG Zhong-ming;SHI Zhao-feng;YANG Xue;TIAN Xiang;XIAO Zhe-zhen;LIU Chen-zhi;HUANG Xiang-yi(School of Hydraulic and Environmental Engineering,Changsha University of Science&Technology,Changsha,Hunan 410114,China;Key Laboratory of Water-Sediment Sciences and Water Disaster Prevention of Hunan Province,Changsha University of Science&Technology,Changsha,Hunan 410114,China;School of Civil Engineering,Changsha University of Science&Technology,Changsha,Hunan 410114,China)

机构地区：[1]长沙理工大学水利与环境工程学院,湖南长沙410114 [2]长沙理工大学水沙科学与水灾害防治湖南省重点实验室,湖南长沙410114 [3]长沙理工大学土木工程学院,湖南长沙410114

出　　处：《岩土力学》2024年第12期3545-3554,共10页Rock and Soil Mechanics

基　　金：国家自然科学基金(No.52178381);2023年湖南省研究生科研创新项目(No.CX20230883)。

摘　　要：聚合物砂浆(polymer mortar,PM)因其良好的气密性、抗裂性和变形适应性被认为是一种极具发展潜力的建造压缩空气储能(compressed air energy storage,CAES)人工硐室储气库密封层的可选材料之一。为探究聚氨酯类聚合物砂浆(polyurethane polymer mortar,PPM)与人工硐室储气库衬砌混凝土之间的黏结性能和变形适应性,采用室内试验和数值模拟方法,研究了PPM中粉料和聚合物含量以及配比变化对PPM-混凝土界面的黏结性能和变形性能的影响规律,并分析了界面的破坏特征和破坏机制。研究结果表明:PPM-混凝土界面破坏型式主要表现为界面两侧材料的分离;界面剪应力-位移关系在应力峰值前呈现两阶段近似线性变形特征,界面破坏剪切应变最大值可达11.05%;粉料和聚合物含量以及配比变化对界面黏结强度都有重要的影响,最高黏结强度约为1.21MPa,最低平均黏结强度为0.237MPa。PPM-混凝土界面强度和变形性能可满足CAES地下储气库的建库要求。Polymer mortar(PM)is recognized as a promising material for constructing the sealing layer of man-made caverns used in compressed air energy storage(CAES)systems,owing to its excellent airtightness,crack resistance,and deformation adaptability.This paper investigates the bonding properties and deformation adaptability of polyurethane polymer mortar(PPM)with lining concrete in man-made cavern gas storage,focusing on the effects of powder,polymer content,and mixture ratio variations on the PPM-concrete interface.Additionally,the failure characteristics and mechanisms of the interface are analyzed.The results indicate that the primary failure mode of the PPM-concrete interface is material separation on both sides.The relationship between interfacial shear stress and displacement exhibits two-stage approximate linear deformation characteristics prior to the stress peak,with a maximum shear strain of 11.05%during failure.Variations in powder and polymer content,as well as mixture ratio,significantly impact the interfacial bond strength.The maximum bond strength was about 1.21 MPa,while the lowest average bond strength was 0.237 MPa.The interfacial strength and deformability of the PPM-concrete interface satisfy the requirements for underground gas storage in CAES systems.

关 键 词：压缩空气储能 人工硐室 密封结构 PPM-混凝土界面 黏结性能 变形特征 

分 类 号：TV322[水利工程—水工结构工程]