| 丁一宁,任县伟,李冬.结构型钢纤维对混凝土单裂缝渗透特性的影响[J].水利学报,2017,48(1):13-20 |
| 结构型钢纤维对混凝土单裂缝渗透特性的影响 |
| Investigation of the fiber effect on the permeability of cracked concrete |
| 投稿时间：2016-04-07 |
| DOI：10.13243/j.cnki.slxb.20160332 |
| 中文关键词: 抗渗性能 裂缝形态 纤维混凝土 修正系数 |
| 英文关键词: permeability crack pattern fiber reinforced concrete correcting coefficient |
| 基金项目:国家自然科学基金项目（51578109） |
|
| 摘要点击次数: 4400 |
| 全文下载次数: 204 |
| 中文摘要: |
| 为研究纤维对裂隙混凝土渗透性能的影响，借鉴圆盘劈裂试验引入可控裂缝，并采用Supereyes数码显微镜和Image Pro Plus（IPP）图像分析软件对裂缝形态进行了分析。对于带裂缝试件，分别利用变水压和恒定水压渗透试验研究了其抗渗性能；参照达西定律及平板渗流模型，提出了在考虑纤维影响后单裂隙混凝土渗透性能的分析方法。研究表明：在圆盘劈裂试验中素混凝土试件发生脆性破坏、无法控制裂缝的发展速率，而掺入结构型钢纤维后，试件不仅表现出良好的韧性和变形能力，而且可实现裂缝扩展速率的有效控制；结构型钢纤维可提高裂缝曲折度，降低裂缝修正系数和渗透介质通过混凝土的能力。与传统变水压渗透系数相比，恒水压渗透试验得出的修正单裂隙渗透系数可较敏感地反映内部裂缝对混凝土渗透性的影响，定量分析裂缝与混凝土渗透性之间的关系。 |
| 英文摘要: |
| According to the splitting testing, controllable cracks are brought into the specimen for studying effects of fibers on permeability of cracked concrete. Crack patterns are analyzed by Supereyes digital microscope and IPP software. To study the permeability of cracked specimens, the water permeability experiment is implemented under a varied water head as well as a constant water head. According to the Darcy's law and Parallel plate theory,the correcting permeability of fiber reinforced concrete with a single crack is suggested. Research shows that:as to the splitting test,the failure form of plain concrete is brittle and can't control the speed of crack's development. After adding some of structural steel fibers, the specimen shows a better toughness and deformation capacity, and that the cracking development can be controlled easily. Structural steel fibers can improve the crack tortuosity,reduce the correcting factor and weaken the penetration ability of permeable medium. Compared with the traditional permeability coefficient, the correcting permeability of concrete with a single crack can sensitively reflect the influence of inner crack pattern under a constant water head,and can also analyze the relationship of them quantitatively. |
|
查看全文
查看/发表评论 下载PDF阅读器 |
| 关闭 |