单轴压缩条件下混凝土破坏声发射特性研究  

Research on acoustic emission characteristics of concrete under uniaxial compression

作　　者：刘飞 黄明松 龚鹏[2] 张建营[2,3] LIU Fei Huang Ming - song GONG Peng ZHANG Jian - ying(Suzhou University, Suzhou 234000 China China University of Mining and Technology, Xuzhou 221008 China Xinyu University, Xinyu 338004 China)

机构地区：[1]宿州学院资源与土木工程学院,安徽宿州234000 [2]中国矿业大学深部岩土力学与地下工程国家重点实验室,江苏徐州221008 [3]新余学院建筑工程学院,江西新余338004

出　　处：《新余学院学报》2017年第5期1-5,共5页Journal of Xinyu University

基　　金：国家自然科学基金项目"深部复杂岩土介质物理构造力学性质及工程效应"(51323004);国家自然科学基金项目"煤炭地下气化燃空区覆岩裂隙演化及破断规律研究"(51204159)

摘　　要：基于声发射技术,以养护天数不同进行分组试验,在其他条件均相同的情况下,分别对养护天数为7天、14天和28天的混凝土和纯水泥试样进行单轴压缩条件下声发射试验,收集整理声发射信号并加以分析,得到三组试样破坏过程中的声发射特性。研究结果表明:影响混凝土声发射特性的因素包括混凝土的养护天数和混凝土材料的差别等;混凝土在外荷载作用下的破坏分三个阶段;混凝土的骨料配比,将会影响混凝土的延展性,相对于纯水泥材料,混凝土材料延展性较好,在结构的稳定性上具有更大的优势。This paper based on acoustic emission technology, according to different curing days of test group, under the other conditions are the same, respectively for curing days for 7 days, 14 days and 28 days of the concrete and cement pure sample for uniaxial compression under the condition of acoustic emission testing, collect acoustic emission signal and analyzed, three sets of specimens were de- stroyed in the process of acoustic emission characteristics. The results show that： the influence concrete acoustic emission characteristics of factors including concrete curing days and concrete difference ; the damage of concrete under the action of the external load divided in- to three stages; ratio of aggregate concrete, the ductility of the concrete will affect, compared to the pure cement materials, ductility of concrete materials better, on the stability of the structure has greater advantage.

关 键 词：混凝土 声发射试验 单轴压缩 声发射特性 

分 类 号：TU528.07[建筑科学—建筑技术科学]