初始孔隙与尺寸效应对碾压混凝土声发射参数的影响  

Effect of Initial Porosity and Size on Acoustic Emission Parameters of RCC

作　　者：张晓飞[1] 余志坚 施润 ZHANG Xiao-fei;YU Zhi-jian;SHI Run(Institute of Water Resources and Hydro-electric Engineering,Xi'an University of Technology,Xi'an 710048,China;Gansu Province Water Conservancy and Hydropower Survey and Design Institute Co.,LTD.,Lanzhou 730000,China)

机构地区：[1]西安理工大学水利水电学院,陕西西安710048 [2]甘肃省水利水电勘测设计研究院有限责任公司,甘肃兰州730000

出　　处：《水电能源科学》2022年第7期171-174,共4页Water Resources and Power

基　　金：国家自然科学基金项目(51479168)。

摘　　要：为研究初始缺陷和尺寸效应对碾压混凝土材料在受压和劈拉条件下的内部损伤和破坏规律,使用4种不同孔隙率和3种不同尺寸的碾压混凝土立方体试件进行抗压和劈拉的声发射试验,采用的声发射特征参数为撞击数和总撞击数。试验结果表明,碾压混凝土试件的抗压和劈拉试验声发射特征有一定差异,劈拉破坏试件的声发射信号集中表现在试件被破坏时;随着孔隙率的增加,声发射信号表现得越活跃,试验前期尤为显著;碾压混凝土试件尺寸越小,声发射信号越活跃。To study initial defects and the size effect of internal damage and destruction rules in roller compacted concrete materials under compressive and splitting tensile conditions, four kinds of different porosity and three different size of roller compacted concrete cube specimens were used to carry out compressive and splitting of the acoustic emission test. The acoustic emission characteristic parameters were chosen as the impact of the number and the total number of collisions. The test results show that there is a certain difference between the acoustic emission characteristics of RCC specimens in compression test and split test, and the acoustic emission signals of the split test specimens are concentrated when the specimens are destroyed. With the increase of porosity, acoustic emission signals are more active, especially in the early stage of the test. The smaller the size of RCC specimen, the more active acoustic emission signal is.

关 键 词：碾压混凝土 声发射 孔隙率 尺寸效应 抗压试验 劈拉试验 

分 类 号：TV431[水利工程—水工结构工程]