地铁暗挖隧道施工中抗裂防水混凝土的应用与质量控制

Application and Quality Control of Anti Cracking and Waterproof Concrete in Underground Tunnel Construction

为提升地铁隧道安全运营能力,文中提出应用抗裂防水混凝土并对其进行质量控制。以混凝土渗流基本原理为基础,考虑隧道内外侧实际条件结合混凝土开裂系数和渗漏情况,基于立方定律获知开裂混凝土水分渗透公式,构建裂缝处水分传输模型,分析饱和孔隙介质状态下裂缝处水分传输过程及非饱和状态下混凝土裂缝处分水传输过程;基于隧道混凝土分析,利用钢纤维、碳纤维及复合纤维材料与混凝土混合,分别进行混凝土抗冲击实验及抗渗透实验,抗冲击实验结果表明:钢纤维、碳纤维和复合纤维含量增高,混凝土韧性提升,其中韧性最佳为复合纤维混凝土;抗渗透实验表明:三种纤维混凝土中,掺加复合纤维对混凝土抗渗性能提升最高。

In order to improve the safety operation capacity of subway tunnel,this paper puts forward the application of anti crack and waterproof concrete and its quality control. Based on the basic principle of concrete seepage,considering the actual conditions inside and outside the tunnel side with concrete cracking and seepage coefficient,the cubic law informed the cracking of concrete moisture penetration formula based on construction crack model of water transfer,the state analysis of saturated porous media under the crack process of water transport and non saturated concrete water transmission tunnel concrete disposition process; based on the analysis,the use of steel fiber,carbon fiber and composite fiber materials and concrete mixing,respectively,anti shock and anti permeability of concrete experimental test,impact test results show that the increase of steel fiber,carbon fiber and composite fiber content,enhance the toughness of concrete,which is the best toughness of composite fiber concrete showed that the anti penetration experiments: three; fiber reinforced concrete,adding composite fiber permeabilityenhance the highest resistance of concrete.