地下空间及隧道混凝土结构抗裂抗渗新材料研究  

Study on A New Material for Cracking and Permeability Resistance Properties of Concrete in Underground Space and Tunnel Structures

作　　者：张鹏飞 

机构地区：[1]上海世博发展集团公司,上海200125

出　　处：《中国市政工程》2014年第6期79-81,84,共4页China Municipal Engineering

基　　金：上海市科委课题资助项目(13231200600)

摘　　要：地下空间是城市快速发展越来越依赖的重要生产、生活、交通场所,地下空间常年受地下水环境影响,因此地下混凝土结构的抗裂抗渗性能尤为重要。目前,地下空间混凝土产生裂缝和渗漏现象较普遍,对结构、设备及人们生产、生活造成严重不利影响。针对这一现象,介绍地下空间及隧道混凝土结构抗裂抗渗新材料:纤维素纤维。结合在上海虹桥交通枢纽地下空间和世博央企总部基地地下空间混凝土结构中的应用进行分析,经检测,抗压强度略有提高,裂缝数量、面积大幅度降低(裂缝减少97.3%),尤其在有荷载情况下,纤维混凝土更有效地改善混凝土的抗渗性能。Underground space has been playing a more and more important role in production, living and transportation during the rapid development of modern cities. Underground space is perennially surrounded by underground water, which means the concrete requires more cracking and permeability resistance. However, numbers of underground space concrete structures suffering cracking and leaking are not qualified for the service of structures and equipment as well as people living and production. The cellulose fiber is introduced in this paper as a new material for improving cracking and permeability resistance properties of concrete for underground space and tunnel. Case studies of the Shanghai Hongqiao Transport Hub and the Headquarters Base of Central Enterprises in Expo Area are presented as well. Test results show that concrete reinforced by cellulose fiber has a slightly higher compressive strength, remarkably lower cracking in quantity and area, as calculated to 97.3% of cracking reduction. The permeability of fiber reinforced concrete presents more improvement especially in case of under load specimen.

关 键 词：地下空间 隧道 抗裂 抗渗 纤维素纤维 

分 类 号：U454.9[建筑科学—桥梁与隧道工程]