基于声发射的混凝土热力耦合损伤特性研究  

Analysis of Damage Characteristics of Concrete Thermodynamic Coupling Based on Acoustic Emission

作　　者：宿辉[1,2] 栾亚伟 胡宝文 马秋娟[1,2] SU Hui;LUAN Ya-wei;HU Bao-wen;MA Qiu-juan(School of Water Resources and Hydropower,Hebei University of Engineering,Handan 056021,China;Key Laboratory of Smart Water Conservancy of Hebei Province,Handan 056021,China)

机构地区：[1]河北工程大学水利水电学院,河北邯郸056021 [2]河北省智慧水利重点实验室,河北邯郸056021

出　　处：《水电能源科学》2023年第10期158-162,共5页Water Resources and Power

基　　金：河北省自然科学基金项目(E2019402256,E2020402087)。

摘　　要：为研究在100℃内热力耦合因素对水利工程混凝土材料损伤特性的影响规律,采用自主设计的温度控制装置对混凝土试件施加并稳定目标温度,利用无损监测声发射技术(AE)监测不同温度环境下混凝土单轴压缩试验全程。探究了5种不同温度下混凝土破坏过程中AE振铃计数及幅值变化情况,并根据振铃计数与应力的变化关系建立了热力耦合下混凝土损伤本构模型。结果表明,累计振铃计数在100℃较20℃下提高了5.25倍,幅值在加载后期较前期提高20~40 dB,累计振铃计数和幅值分别从损伤事件数量和损伤剧烈程度表现出温度越高,损伤事件数量越多,损伤程度越剧烈。所建损伤本构模型证明了温度的提高会增加混凝土的损伤程度,为理解热力耦合对混凝土材料损伤影响规律提供了理论参考。In order to understand the influence of thermodynamic coupling factors on the damage characteristics of hydraulic engineering concrete materials within 100 ℃,the temperature of concrete specimens is applied and stabilized by self-designed temperature control device,and non-destructive monitoring acoustic emission technology(AE) is used to monitor the uniaxial compression of concrete under different temperature environments.The AE ringing count and amplitude change during concrete failure at five different temperatures are explored,and the constitutive model of concrete damage under thermodynamic coupling is established according to the relationship between ringing count and stress.The results of the cumulative ringing count and amplitude show that the higher the temperature,the higher the number of damage events,the more severe the degree of damage,respectively,the cumulative ringing count increases by 5.25 times at 100 °C compared with 20 °C,and the amplitude can be increased by 20-40 dB in the late loading stage compared with the previous stage.The established damage constitutive model shows that the increase of temperature will increase the degree of damage of concrete,which provides a theoretical reference for understanding the influence of thermodynamic coupling on the damage of concrete materials.

关 键 词：热力耦合 混凝土 单轴压缩 声发射 温度 损伤特性 

分 类 号：TV431.9[水利工程—水工结构工程]