纤维对喷射混凝土抗折强度的影响  

Influence of Fiber on Flexural Strength of Shotcrete

作　　者：王嘉旋 王家赫 渠亚男 仲新华 苏婉玉 李连吉 孔庆欣 WANG Jiaxuan;WANG Jiahe;QU Yanan;ZHONG Xinhua;SU Wanyu;LI Lianji;KONG Qingxin(Railway Engineering Research Institute,China Academy of Railway Sciences Corporation Limited,Beijing 100081,China;State KeyLaboratory for Track Technology of High-speed Railway,China Academy of Railway Sciences Corporation Limited,Beijing 100081,China)

机构地区：[1]中国铁道科学研究院集团有限公司铁道建筑研究所,北京100081 [2]中国铁道科学研究院集团有限公司高速铁路轨道技术国家重点实验室,北京100081

出　　处：《铁道建筑》2023年第6期136-139,共4页Railway Engineering

基　　金：中国铁道科学研究院集团有限公司基金(2021YJ173)。

摘　　要：针对素喷射混凝土强度低、韧性差、破坏呈脆性的特点,在混凝土中掺入了工程中常用的纤维,研究纤维对喷射混凝土抗折强度的影响并提出抗折强度发展公式,阐明了不同纤维对混凝土抗折强度的增强机理。结果表明:随着纤维掺量增大,混凝土抗折强度呈线性增长;相同体积掺量下,对抗折强度提高效果最好的是端钩型钢纤维,其次是波纹型钢纤维,最次为仿钢纤维;端钩型钢纤维有利于明显改善喷射混凝土的延性。In response to the characteristics of low strength,poor toughness,and brittle failure of plain shotcrete,commonly used fibers in engineering were added to the concrete.The influence of fibers on the flexural strength of shotcrete was studied,and a formula for the development of flexural strength was proposed.The strengthening mechanism of different fibers on the flexural strength of concrete was elucidated.The results show that as the fiber content increases,the flexural strength of concrete increases linearly.Under the same volume dosage,the end-hooked steel fiber has the best effect on improving flexural strength,followed by corrugated steel fiber,and then is imitation steel fiber.The end-hooked steel fiber is beneficial for significantly improving the ductility of shotcrete.

关 键 词：铁路隧道 抗折强度 试验研究 喷射混凝土 纤维 混凝土延性 

分 类 号：U455.481[建筑科学—桥梁与隧道工程] TU528.53[交通运输工程—道路与铁道工程]