类岩石材料变形损伤与波速关系试验研究  

Experimental Study on the Relationship Between Deformation and Damage of Rock Like Material and Wave Velocity

作　　者：张金浩[1] 陈洪凯[1] 王贺[1] ZHANG Jinhao;CHEN Hongkai;WANG He(Institute of Geotechnical Engineering,Chongqing Jiaotong University,Chongqing 400074,China)

机构地区：[1]重庆交通大学岩土工程研究所,重庆400074

出　　处：《人民黄河》2018年第7期104-107,共4页Yellow River

基　　金：国家自然科学基金资助项目(11272185;50678182;51678097);2016年重庆高校创新团队建设计划资助项目(CXTDG201602012);重庆市"两江学者"计划专项(201309)

摘　　要：通过单轴压缩试验结合超声波量测,得到波速随加载过程的变化值,以此定义类岩石材料的损伤点。试件在制作和成型过程中不可避免地存在初始损伤,将其定义为第一损伤点;当试件局部有裂纹出现,波速随应变的增大陡然减小,将其定义为第二损伤点;随即利用超声波仪器检测该局部波速的变化,当波速明显急剧减小时,说明已经达到损伤极限值,将其定义为第三损伤点。根据试验实测数据,采用分段曲线拟合,得到基于波速变化的损伤演变试验模型。Based on theuniaxial compression test and ultrasonic measurement, the change of the wave velocity of the specimen with loadingprocess was obtained. That is, the initial damage was inevitable in the process of fabrication and forming, which was defined as the first da-age point; When there was a crack in the specimen, the wave velocity was decreased sharply with the increase of strain, which was defined as second damage points; The ultrasonic wave was used to detect the change of the wave velocity in the local specimen. When the wave velocity was decreased sharply, it showed that the test had reached the limit of damage, which was defined as third damage points. Based on the measured data, the experimental data were fitted by the curve fitting and the damage evolution model was obtained. The study has provid-ed a theoretical reference for the research on the deformation and damage of rock materials.

关 键 词：单轴压缩试验 超声波量测 损伤点 变形损伤 类岩石材料 

分 类 号：TU458[建筑科学—岩土工程]