盾构管片纤维混凝土高温后抗压性能研究  

A Study on Compression Properties of Fiber-reinforced Concrete of Segment for Shield-driven Tunnel after High Temperature

作　　者：强健[1] 朱合华[2] 王恒栋[1] 沈晔[1] 闫治国[2] 

机构地区：[1]上海市政工程设计研究总院,200092 [2]同济大学地下建筑与工程系,上海200092

出　　处：《特种结构》2008年第3期87-91,共5页Special Structures

基　　金：上海市重大科技攻关计划-地下空间防灾安全关键技术及其应用(04dzl2010)

摘　　要：本文对盾构法隧道管片有应用前景的纤维混凝土的高温后抗压性能进行了试验研究,分析了分别掺入钢纤维和聚丙烯纤维的C50混凝土高温后残余抗压强度的劣化规律,探讨了纤维、温升速率、冷却方式对混凝土高温后性能的影响机理,分析了纤维混凝土的受压应力-应变关系。研究结果表明:经历温度越高,纤维混凝土强度损失越大;纤维种类、温升速率、冷却方式均可影响混凝土的高温后抗压性能;给出基于试验结果的C50纤维混凝土高温后受压应力-应变曲线拟合方程。Compression properties after high temperature of fiber-reinforced concrete, which was promisingly used in Shield-driven Tunnel, were investigated in the paper. The deterioration regularity of C50 concrete, which was blended with steel fiber and polypropylene fiber, was researched. The influence of fiber, heating velocity and cooling regimes on the mechanical properties of concrete were discussed. The stress-strain relationship of fiber-reinforced concrete after high temperature was studied. The results show that the strengthen loss of fiber-reinforced concrete increases with elevated temperature. Kind of fiber , heating velocity, cooling regimes can influence compression properties of fiber-reinforced concrete after high temperature. Basing on test data, the fitted equation of stress-strain curve of C50 fiber-reinforced concrete is given.

关 键 词：混凝土 抗压性能 纤维 盾构 高温后 

分 类 号：U454[建筑科学—桥梁与隧道工程]