| 摘要: |
| 采用三维数字图像相关方法（3D-DIC）对不同玄武岩纤维（BF）体积分数的玄武岩纤维-活性粉末混凝土（BF-RPC）进行单轴压缩破坏过程观测，分析破坏过程中BF-RPC裂纹扩展过程、损伤规律和破坏模式.结果表明：BF-RPC破坏过程可分为原生裂纹闭合、弹性变形、裂纹稳定扩展和裂纹加速扩展4个阶段；BF-RPC的损伤在扩容应变前较小且增长平缓，在扩容应变后迅速增长，在峰值破坏时随BF体积分数的增大而增大；BF体积分数影响BF-RPC的破坏模式，未掺入BF的活性粉末混凝土破坏模式为拉伸破坏，BF体积分数为0.5%和1.0%时，BF-RPC破坏模式均为拉剪破坏，BF体积分数为1.5%时，BF-RPC破坏模式为剪切破坏. |
| 关键词: 数字图像相关法 玄武岩纤维 活性粉末混凝土 单轴压缩 损伤演化 破坏模式 |
| DOI：10.3969/j.issn.1007-9629.2022.05.007 |
| 分类号:TU528.572 |
| 基金项目:国家自然科学基金资助项目（51974316）；旧桥检测与加固交通行业重点实验室（北京）开放课题资助（2020-JQKFKT-5） |
|
| Effect of Basalt Fiber on Failure of Reactive Powder Concrete under Uniaxial Compression |
|
YANG Liyun, LIN Changyu, ZHANG Fei, XIE Huanzhen, WANG Ziyang
|
|
School of Mechanics and Civil Engineering， China University of Mining and Technology（Beijing），Beijing 100083， China
|
| Abstract: |
| The uniaxial compression failure process of basalt fiber-reactive powder concrete （BF-RPC） with different volume fraction of basalt fiber （BF） was observed by three dimensional-digital image correlation （3D-DIC） method. The crack propagation process， damage law and failure mode of BF-RPC in the failure process were studied. The results show that the failure process of BF-RPC can be divided into four stages： crack closure， elastic region， cack stable growth and crack accelerated growth. The damage is small and grows steadily before the dilatancy strain， but increases rapidly after dilatancy strain， and increases with the increase of the volume fraction of BF at peak failure. The BF-RPC failure mode is affected by the volume fraction of BF. The failure mode of reactive powder concrete without BF is tensile failure. When the volume fraction of BF is 0.5% and 1.0%， the failure mode of BF-RPC is tension-shear failure. When the volume fraction of BF is 1.5%， the failure mode of BF-RPC is shear failure. |
| Key words: digital image correlation basalt fiber reactive powder concrete uniaxial compression damage evolution failure mode |
